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Archive 2013 · Yesterday's medium format digital backs

  
 
carstenw
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p.4 #1 · Yesterday's medium format digital backs


The Kodak SLR/n and SLR/c had CMOS sensors... Did you just counter-prove your own point?

http://www.dpreview.com/reviews/kodakslrc



Jul 03, 2013 at 03:53 AM
alundeb
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p.4 #2 · Yesterday's medium format digital backs


Nice catch, Carsten

I was just going to add: I see color differences between ALL sensors.



Jul 03, 2013 at 03:58 AM
mortyb
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p.4 #3 · Yesterday's medium format digital backs


Hmm, I was sure they had CCDs. But yes, you're right. Maybe it's the Kodak processing that I really like (SLR/c, Pro Back, Pentax 645D). But there was a quite significant change in colors from Nikons DSLRs with CCD and CMOS. This has been debated endlessly on DPR among other forums. The question is of course: Was this due to change in sensor type - or was it simply a choice made wrt. processing.

alundeb, it's not about color differences alone, of course there are differences between sensors and cameras. But I'm not the only one thinking older CCD cameras/backs have 'something' more modern CMOS cameras often lack. Question remains the same as above, of course.



Jul 03, 2013 at 04:05 AM
briantho
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p.4 #4 · Yesterday's medium format digital backs


Makten wrote:
Of course, and the MF lens will most likey render a less sharp image on FF than an FF lens with the same focal length. There is no inbuilt mojo in MF lenses. They project a larger image circle and thus in most cases give lower resolution.

I suggest you try it out for yourself. If I had a P67 adapter I'd compare the 105/2.4 to the Nikkor 105/2.5, and I'm sure the Nikkor would perform better because of the smaller image circle.


That's a myth Makten. In general, it may be true, but there are some MF lenses that are at least as sharp on APS-C (not to mention FF) as the best native APS-C lenses. People just assume this couldn't be the case.

I've shot the HB 110mm f2, the Contax 80mm f2 and the Contax 120m f4 apo-makro with my NEX cameras, and I have posted photos many times on this forum, even with links to 100% original size versions. Those three lenses are at least as good as the best native alternatives on APS-C.

In fact I'd suggest you get that P67 adapter, and try out your own suggestion, and perhaps you'll be surprised at the result.



Jul 03, 2013 at 06:09 AM
jcolwell
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p.4 #5 · Yesterday's medium format digital backs


briantho wrote:
That's a myth Makten...


+1



Jul 03, 2013 at 06:36 AM
alundeb
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p.4 #6 · Yesterday's medium format digital backs


Ok guys, we have words from skilled and trustworthy members claiming both that some MF lenses are at least as sharp as comparable lenses of comparable focal lengths for smaller formats, and that they are not.

This is a technical forum, and I hope both sides can provide some links with valid side-by-side comparisons.

Data sheets from Zeiss indicate that the Makro-Planar 100 ZF.2 is sharper than the Contax 120 apo-makro at equal apertures, but the difference is small and diminshing stopped down.

Regarding native APS-C lenses, there is not much out there in the tele range, so I guess that is an easy match. The Canon EF-S 60 mm macro is the best I can think of.



Jul 03, 2013 at 07:24 AM
naturephoto1
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p.4 #7 · Yesterday's medium format digital backs


alundeb wrote:
Ok guys, we have words from skilled and trustworthy members claiming both that some MF lenses are at least as sharp as comparable lenses of comparable focal lengths for smaller formats, and that they are not.

This is a technical forum, and I hope both sides can provide some links with valid side-by-side comparisons.

Data sheets from Zeiss indicate that the Makro-Planar 100 ZF.2 is sharper than the Contax 120 apo-makro at equal apertures, but the difference is small and diminshing stopped down.

Regarding native APS-C lenses, there is not much out there in the tele range, so I guess that is an
...Show more

Overall generally and especially older MF lenses are not as sharp as the best FF lenses. Some of the best and newer MF lenses can be as sharp or sharper than many of the better FF lenses. It all depends on the lenses that are being considered. Certainly some of the newest digital MF and LF lenses are extremely sharp (but particularly for the Rodenstock and Schneider lenses they are optimized closer to maximum aperture while older MF and LF lenses designed for LF and technical cameras have been optimized to be stopped down a fair amount to support great DOF). Unfortunately lenses like those for the Mamiya 7 cameras which are among the sharpest MF designed to date to the best of my knowledge can not be adapted.

Rich



Jul 03, 2013 at 07:31 AM
douglasf13
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p.4 #8 · Yesterday's medium format digital backs


sflxn wrote:
To me, there's three sides to the digital medium format look. The colors, the smooth tonal transition, and the resolution. Of the three, I have not seen the colors replicated from FF 35mm output. A lot of people have struggled and tried, but I have yet seen it duplicated. Part of it is the CCD look, which I much prefer to the CMOS look. The other might be the color profile that the medium format makers are using. However, seeing that these companies are tiny compared to Canon and Nikon, I do not believe they have the resources to have
...Show more

Of course theSuede should weigh in here, but Iliah Borg, who, among other things, does the color profiles for RPP, says that Sony (and I believe Leica) uses color filters similar to medium format. I believe the Nikon D2X, too.



Jul 03, 2013 at 08:22 AM
RustyBug
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p.4 #9 · Yesterday's medium format digital backs


+1 @ the CCD "look" vs. the CMOS "look" (but unsure @ the "why" of sensor vs. algorithm) ... my original research had me expecting the Kodak SLR/C to be CCD when I researched it before I purchased it, but I too was surprised (back then) to learn that isn't. That makes the SLR/C kind of an enigma, which I guess gives it a perpetual "Alt" personality.


There are lots of Nay-sayers around who have never shot MF glass on smaller formats that are clamoring for irrefutable, perfect proof of what has been stated, and suddenly now that skilled and trustworthy members have chimed in (guess that makes me unskilled and untrustworthy ), credence has been extended to the possibility of the significance of the glass.

Lots of folks have been telling me for years now, the same reasons why it can't be the glass (i.e. it must be the format size) ... yet the first rule of photography is that it all starts with the glass. The properties of light being transmitted by the glass don't change just because you only capture a portion of it. The colors, tones, transition rates and other combined optical properties responsible for the drawing style of that projection remain the same (just absent the area cropped/not captured). The drawing style of an MF lens (of any lens) will project the same ... no matter what you project it on to.

Some here will still contend that the "look" comes from the format size. Does the "Zeiss look" or "Leica Look" or "Oly Look" come from the format ... no, it comes from the optical projection. Best I can figure, using MF glass on a smaller format doesn't change the optical projection of the glass, thus it doesn't change "the look" or drawing style of the glass. The only thing that changes is the capture area because of the smaller sensor. The sensor/film size cannot alter the properties of projected image, it only alters the area captured.

Interestingly ... nobody has bothered to comment on why using a Canon 135/2 L would produce a different "look" if it was shot on a 5D vs. 1D II vs. 50D. Since the optical projection is the same, why will "the look" change? The FOV/area captured will obviously reflect the crop due to the smaller sensor ... and then when you start playing the silly "equivalent focal length" game to garner equivalent FOV by shooting from different perspective, then the DOF/etc. changes come along for the ride. But if you are using an 80mm FF lens on FF sensor vs. an 80mm MF lens on FF sensor, 80mm=80mm, so there is no need to try to develop an "equivalent" factor in the MF vs. FF format rational, nor change your perspective to get an equivalent FOV, i.e. 80mm=80mm.

But, if you treat it exactly for what it is ... a crop ... you may come to realize that the optical projection is identical, but we are only seeing the centralized portion as afforded by the FF vs. APS-H vs. APS-C crop. The optical projection or "look" / drawing style of the lens remains unchanged. Why would the projection (drawing style/"look") from a world class MF lens then be changed by projecting it onto a smaller capture area?

I realize that I mostly "stand alone" here attributing the "look" to the projected image, but just in case it should strike a chord with any of our fellow members ... I freely offer it for others to consider as they develop their own rational and draw their own conclusions. After all, it was the knowledge, wisdom and experience of the Alt Forum who freely offered and taught these two words to me several years ago ... "drawing style".

Best I can figure, the drawing style or "look" (Leica, Zeiss, Oly, MF, Cinematic, etc.) always starts from the lens. What gets done with it after you've captured it ... well, that's "Part 2".




Jul 03, 2013 at 08:50 AM
Mescalamba
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p.4 #10 · Yesterday's medium format digital backs


CCD vs CMOS

Hm I would say that CCD has different way of dealing with contrast and different response in PP to contrast/saturation boosts. CMOS is usually bit more "gentle", CCD is maybe bit closer to film.

Kodak SLR/n and c, ProBack or DMR are so good cause of CFA, plus CMOS for SLR/n was apparently designed with colors in mind (at least it seemed that way from PDF I read about it). Kodak was a lot like Sony today, color/resolution over everything. I guess it was tied a bit to Kodak past, where bit of noise (grain) on film didnt matter much.



Jul 03, 2013 at 10:24 AM
RustyBug
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p.4 #11 · Yesterday's medium format digital backs


Makten wrote:
It's not about the lenses.


Imo, it's always about the lenses.

Maybe a bit of "chicken & egg" thing going on here. By that, I mean because the format changes the size/angles/distance involved ... it allows for different lens design ... which is responsible for the drawing style / look of the projected image. Because we have historically associated the lens design with the format size, we (naturally) associate the outcome of the look to the format size. But, while there is a correlation derived to the format size (used with lens designed for that format), it does not negate the properties of that optical projection just because you only capture a portion of it.

Another way of thinking about it ... if an MF lens has a given MTF that is charted across the frame @ distance from optical center and it projects an image with 90 @ 5mm, 90 @ 10mm, 90 @ 15mm, 85 @ 20mm, 80 @ 25mm, 70 @ 30mm ... what will be the MTF of the projection at the edges of a FF sensor which is 18mm from optical center?


Edited on Jul 03, 2013 at 11:16 AM · View previous versions



Jul 03, 2013 at 10:45 AM
Toothwalker
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p.4 #12 · Yesterday's medium format digital backs


briantho wrote:
That's a myth Makten. In general, it may be true, but there are some MF lenses that are at least as sharp on APS-C (not to mention FF) as the best native APS-C lenses. People just assume this couldn't be the case.

I've shot the HB 110mm f2, the Contax 80mm f2 and the Contax 120m f4 apo-makro with my NEX cameras, and I have posted photos many times on this forum, even with links to 100% original size versions. Those three lenses are at least as good as the best native alternatives on APS-C.

In fact I'd suggest you get
...Show more

On average the lenses for a smaller format deliver an image with more microcontrast. Objective confirmation can be found, for example, by comparing the Zeiss lens sheets for Hasselblad and ZE/ZF.

However, as you say one should not overgeneralize this and say that it is not possible at all that a larger-format lens performs as well as its smaller cousin. It is possible, but it requires extra design effort. What one can say without hesitation, is that an MF lens is unnecessarily big and costly for what it delivers on FF or APS (except for the vignetting aspect). You can get the same in a smaller and cheaper package.








Jul 03, 2013 at 11:14 AM
RustyBug
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p.4 #13 · Yesterday's medium format digital backs


Toothwalker wrote:
What one can say without hesitation, is that an MF lens is unnecessarily big and costly for what it delivers on FF or APS (except for the vignetting aspect). You can get the same in a smaller and cheaper package.


But, the smaller format glass will not give you the same drawing style / "look" as MF glass, i.e. it really isn't the same. The angles of projection (not referring to aov/fov) will be different/steeper to the edges/corners (and correspondingly different lens design to contend with it) ... part of the reason for the different "look" coming from MF vs. FF vs. APS designed glass, along with other aspects of the projected image. Similar applies as you continue to move ever closer to the film plane with your projection.

Smaller gear ... yeah, that one's kinda tough to refute in many instances. But, cheaper doesn't necessarily hold true ... check out M645 glass prices ... held down thanks in part to the masses who perpetually refute MF glass on FF and the surge toward smaller is better.

Edited on Jul 03, 2013 at 11:52 AM · View previous versions



Jul 03, 2013 at 11:30 AM
Taylor Sherman
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p.4 #14 · Yesterday's medium format digital backs


If you want to believe that there's an inherent - and consistent - "look" difference betwen MF lenses and FF lenses, I'm not sure why I'd want to stop you.

On the other hand, it seems clear to me that you're just talking about some subjective differences you've noticed between some MF lenses and some FF lenses. Well, I've noticed a lot of subjective differences between some FF lenses and some other FF lenses, or between them and some APS-C lenses, or whatever.

If a lens gives you the look you want, by all means, use it.

But it's pretty obvious that you're not going to convince anyone here that there's an objective, measurable reason why all MF lenses would have a certain something different than any native lens when used on FF.

Or maybe I've got it backwards, people here were trying to convince you of something? I guess my point is there's subjective and there's objective, and it doesn't make sense to argue about the former.



Jul 03, 2013 at 11:51 AM
RustyBug
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p.4 #15 · Yesterday's medium format digital backs


+1 @ each lens stands on its own ... that's the entire point.

You want an MF look, get an MF lens. Pretty simple, imo.

But, as to ALL MF lenses ... they all project from a different distance/angle than their FF or crop counterparts (Trigonometry 101) ... nothing subjective about that. Whether or not others want to believe that this impacts the MF "look" ... or believe that it is attributed to the size of the film/sensor everyone has to make that assessment for themselves.

Btw, if we use MF glass on digital MF vs. MF glass on film MF, (i.e. different size of capture area from same projected image) ... does the MF "look" change again based on the capture area ... or does the drawing style / "look" of the projected image remain the same, just a larger area of capture/greater fov?

Edited on Jul 03, 2013 at 12:44 PM · View previous versions



Jul 03, 2013 at 11:54 AM
briantho
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p.4 #16 · Yesterday's medium format digital backs


Toothwalker wrote:
On average the lenses for a smaller format deliver an image with more microcontrast. Objective confirmation can be found, for example, by comparing the Zeiss lens sheets for Hasselblad and ZE/ZF.

However, as you say one should not overgeneralize this and say that it is not possible at all that a larger-format lens performs as well as its smaller cousin. It is possible, but it requires extra design effort. What one can say without hesitation, is that an MF lens is unnecessarily big and costly for what it delivers on FF or APS (except for the vignetting aspect). You can
...Show more

When comparing MTF, are you taking the bigger circle diameter of MF in to consideration? Also, are you comparing wide open to wide open, or are you comparing stopped down FF to wide open MF? I don't know how fair it is to compare MTF:s of lenses for different formats as if they were for the same format. I am basing my opinion on actual real life results.

You can certainly go smaller, but cheaper? Not always. Prices are not very high for MF lenses, you can get some exceptional quality for bargain prices.

HB 110 f2. The Contax 100mm f2 could compare, the price is about the same, perhaps a bit higher for the HB.
Contax 80mm f2. Same here, closest match is Contax 100mm f2, and it's much more expensive than the Contax 80mm.
Contax 120mm f4. The closest match is Leica 100mm apo-macro-elmarit, about three, four times as expensive as the Contax.

I'm using the MF lenses on NEX because I own them, and not using them would be a waste, but my final goal is not to use these MF lenses on APS-C, it's to use the lenses with a digital back on a C645.



Jul 03, 2013 at 11:58 AM
Toothwalker
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p.4 #17 · Yesterday's medium format digital backs


RustyBug wrote:
But, the smaller format glass will not give you the same drawing style / "look" as MF glass, i.e. it really isn't the same. The angles of projection (not referring to aov/fov) will be different/steeper to the edges/corners (and correspondingly different lens design to contend with it) ... part of the reason for the different "look" coming from MF vs. FF vs. APS designed glass, along with other aspects of the projected image. Similar applies as you continue to move ever closer to the film plane with your projection.


I am not going to argue against the subjective "drawing style / look" thing. When people use these terms here, I often get the impression that they are talking about appreciation of residual aberrations. Aberrations can be had for little money.


Smaller gear ... yeah, that one's kinda tough to refute in many instances. But, cheaper doesn't necessarily hold true ... check out M645 glass prices ... held down thanks in part to the masses who perpetually refute MF glass on FF and the surge toward smaller is better.


OK, that is the existing used market. My point is more that if you approach a lens designer with your requirements for the image to be cast on an APS sensor, he would not need to make a lens with an MF image circle. Or, if you have a given sum of money available and appreciate microcontrast, you can get more of it with a lens whose image circle is tailored to the format.









Jul 03, 2013 at 12:11 PM
Toothwalker
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p.4 #18 · Yesterday's medium format digital backs


briantho wrote:
When comparing MTF, are you taking the bigger circle diameter of MF in to consideration?


No.


Also, are you comparing wide open to wide open, or are you comparing stopped down FF to wide open MF? I don't know how fair it is to compare MTF:s of lenses for different formats as if they were for the same format. I am basing my opinion on actual real life results.


I am comparing in MTF whatever you are comparing in your real life results.



Jul 03, 2013 at 12:16 PM
RustyBug
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p.4 #19 · Yesterday's medium format digital backs


Re: OEM lens design to match a natively smaller format.

Smaller format = smaller image circle
Smaller image circle = closer to film plane or shorter focal length (for same fov)
Closer to film plane = steeper angles
Shorter focal length = smaller aperture (for same f-stop)
Smaller aperture = more dof

Inverse @ MF designed glass.

We like to say it is the attributed to the format difference, but imo, it really is the changes in lens design (to accommodate a different format) that is responsible for the "look" of the projected image ... whatever a given "look" may be.



Jul 03, 2013 at 12:24 PM
douglasf13
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p.4 #20 · Yesterday's medium format digital backs


My head is spinning a little bit from this thread, and I'm not sure what's being argued. I don't see using my MF lenses on my A900 as giving a MF look anymore than saying my A900 lenses on my NEX-5 give more of a FF look than my native Nex lenses. If anything, using lenses designed for the format tend to have more falloff as you get towards the edges, which makes things look less flat (unless the lenses have a zone B dip.)

As far technical performance, it varies quite a bit, depending on the mtf. In general, the large format lenses don't need as strong of an mtf as smaller format lenses do, so you are potentially loosing resolution by using larger format lenses, but that depends on the specific lenses.



Jul 03, 2013 at 12:49 PM
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