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Archive 2012 · OMD and 20mm f1.7

  
 
wolfloid
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p.1 #1 · OMD and 20mm f1.7


I'm getting more and more tempted by the OMD and the 20/1.7 as a small discrete carry around. I'd almost settled on a Fuji X100, I like the form and the optical viewfinder, but I've been reading about the flare problem and some of the examples look horrendous, even at smaller apertures. This may not be a problem for a lot of people, but I like shooting into the light - contre jour.

I'd like to ask those who are using the combination of OMD and 20mm whether there are any problems.

1. I've heard the auto-focus with the 20mm is slow. Can someone put that into context for me. How slow? As slow as the X100?

2. Aren't some of the 20/1.7's aberrations corrected in camera? If so, then what will the IQ be like on the OMD?

3. What is the flare control like on the 20/1.7?

Please don't recommend the Leica 25/1.4 - I know it's better, but I don't want the extra length or that tighter field of view.

I hate the idea of using a video screen as a viewfinder - how good or bad is it compared to looking through a 5DII?
Thanks.



May 09, 2012 at 01:38 PM
FlyPenFly
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p.1 #2 · OMD and 20mm f1.7


40mm is a weird FoV for me personally. I prefer 35m or 60mm. But that's just personal.

The 20mm F1.7 is a noisy slow lens and IMO, over rated although it does have slimness going for it. I can't say I'm a fan of the rendering style of this lens out of camera, usually needs a heavy hand in post.

Its not as slow or missive as the X100 was for me.



May 09, 2012 at 02:13 PM
formula4speed
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p.1 #3 · OMD and 20mm f1.7


1. I've only had the combo a few hours (just got the OMD this afternoon) so I can't speak on all the points but I think I would compare the 20 1.7 focus to something like the Canon 50 1.8, audible and not blazing fast, but for static and slow moving stuff it does fine.

2. I should have a better idea about aberrations soon enough as I've taken, but not downloaded, some higher contrast scenes with white objects.

3. Honestly can't say, I don't think I've shot much in the sun with it, even on my old setup.

I have mixed feelings about EVFs, things seem more "real" in an OVF to me, but EVFs are really useful and I think make shooting easier in many cases. I think you just have to try it.



May 09, 2012 at 03:52 PM
FlyPenFly
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p.1 #4 · OMD and 20mm f1.7


Apt comparison to a nifty fifty.


May 10, 2012 at 06:52 AM
dino8031
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p.1 #5 · OMD and 20mm f1.7


I've only had the EM-5 for a couple of days and I have yet to see the sun, so there are some things upon which I cannot comment.

The Nifty Fifty comparison is valid in some ways, but nothing is built quite as poorly as that thing. The 20mm is small but sturdy.

AF is relatively slow in low light compared to a faster lens like the 45mm which is virtually instantaneous and it does tend to hunt a bit. That being said I've used the lens a lot and it spends a lot of time on my camera, even though I also own the 25mm.

It's also very sharp but can be a little lifeless and does require some post work on color and contrast but can produce very nice images. I hate to say it but the 25 is much better right out of the camera. It's a wonderful lens but just a little too long.

The best thing about the 20mm is the focal length. It's just about perfect for what I like to shoot, extremely versatile.

So, I guess it's kind of a mixed bag, but I wouldn't be without it on a m4/3 rig. For only about $300 on the used market it's hard to go wrong.




May 12, 2012 at 05:22 PM
didierv
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p.1 #6 · OMD and 20mm f1.7


I have had the EM5 for about 10 days, I paired with the Pany 14 mm 2.5.
It is also a pancake lens, and so far I am pretty pleased with the results.

AF is extremely fast and reliable.




May 12, 2012 at 07:52 PM
douglasf13
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p.1 #7 · OMD and 20mm f1.7


You may consider the Nex-7 with the Sigma 30/2.8, fwiw, if you're ok with a 45 equivalent lens. The Sigma lens is a little longer, but the OM-D is a taller and deeper camera, so it's about a wash, size-wise. The Sigma is about a half step slower in equivalence, but it's likely better at every aperture, and the Nex-7 will have better IQ and a better EVF, too. Just a thought.


May 12, 2012 at 11:16 PM
aleksanderpolo
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p.1 #8 · OMD and 20mm f1.7


Not sure if they are directly comparable or not:

http://www.lensrentals.com/blog/2012/05/wide-angle-micro-43-imatest-results

http://www.lensrentals.com/blog/2012/04/nex-7-lens-imatest-resolution-comparison

MTF50 Max and Average

20/1.7 at f2.8 is 1050 and 875
at f4 is 1075 and 880

30/2.8 at 2.8 is 985 and 805
at f4 is 1040 and 840

EM5 also seem to have better high ISO than NEX7 from dp's test sample.


douglasf13 wrote:
You may consider the Nex-7 with the Sigma 30/2.8, fwiw, if you're ok with a 45 equivalent lens. The Sigma lens is a little longer, but the OM-D is a taller and deeper camera, so it's about a wash, size-wise. The Sigma is about a half step slower in equivalence, but it's likely better at every aperture, and the Nex-7 will have better IQ and a better EVF, too. Just a thought.





May 12, 2012 at 11:45 PM
douglasf13
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p.1 #9 · OMD and 20mm f1.7


I don't believe the tests would be cross compatible between the two cameras, especially considering the resolution difference between the cameras. Either way, that Panasonic 20/1.7 does look very good.

The dpreview test of the OM-D vs. the NEX-7 is a joke. Outside of not comparing the images at like output size, they gave the OM-D +1 EV more exposure than the NEX-7, and, as I understand it, their lighting setup isn't consistent. DxO will give us a better idea. I'd imagine the lowlight results will be pretty close, but the NEX-7 will still have a decent DR advantage. Either way, I figured the NEX-7 should at least be another option for the OP to consider, since that's the direction a lot of us have gone.



May 13, 2012 at 12:22 AM
aleksanderpolo
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p.1 #10 · OMD and 20mm f1.7


Ya, would love to see DxO's result. The EM5's performance seems impressive from other test result so far.

douglasf13 wrote:
I don't believe the tests would be cross compatible between the two cameras, especially considering the resolution difference between the cameras. Either way, that Panasonic 20/1.7 does look very good.

The dpreview test of the OM-D vs. the NEX-7 is a joke. Outside of not comparing the images at like output size, they gave the OM-D +1 EV more exposure than the NEX-7, and, as I understand it, their lighting setup isn't consistent. DxO will give us a better idea. I'd imagine the lowlight results will be pretty close, but the NEX-7 will still have a decent DR advantage. Either way,
...Show more



May 13, 2012 at 12:26 AM
ebrandon
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p.1 #11 · OMD and 20mm f1.7


I love the E-M5, and I love the Panasonic 20mm, so I'm very sorry to report that with that lens (and apparently only that lens) the E-M5 seems to have a banding issue.

Check out these two threads:
http://forums.dpreview.com/forums/readflat.asp?forum=1041&message=41466000&changemode=1

http://forums.dpreview.com/forums/readflat.asp?forum=1041&message=41451383&changemode=1

I usually don't subscribe to DPReview camera flaw hysteria, but the person who discovered that the banding only happens with the 20mm is my wife, and she does know what she's talking about.





May 13, 2012 at 12:54 AM
FlyPenFly
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p.1 #12 · OMD and 20mm f1.7


Hmmm I wonder if that's from the heavy internal post processing done by MFT even for RAW files.


May 13, 2012 at 06:49 AM
Jman13
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p.1 #13 · OMD and 20mm f1.7


I think it's EM interference....if it were a processing issue it would appear with all lenses, not just one.

Also, the only real RAW processing done with the EM5 is distortion correction.



May 13, 2012 at 07:02 AM
carstenw
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p.1 #14 · OMD and 20mm f1.7


FlyPenFly wrote:
Hmmm I wonder if that's from the heavy internal post processing done by MFT even for RAW files.


Erm, have you heard something I haven't, or just speculating? Got a link?



May 13, 2012 at 07:48 AM
FlyPenFly
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p.1 #15 · OMD and 20mm f1.7


It's pretty common knowledge mft (panasonic in particular) does a significant amount of raw modification for native lenses.

As long as its not too detrimental to iq, I don't see the problem with it.

If you mean particular to this case, I think the "hmmm, I wonder if" should be a big tip off



May 13, 2012 at 08:24 AM
Jman13
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p.1 #16 · OMD and 20mm f1.7


Also, it doesn't actually modify the RAW file for these corrections...it includes tags in the metadata that many RAW converters then pick up and apply as part of the decoding routine. It's not a permanent change to the RAW file.


May 13, 2012 at 08:26 AM
carstenw
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p.1 #17 · OMD and 20mm f1.7


FlyPenFly wrote:
It's pretty common knowledge mft (panasonic in particular) does a significant amount of raw modification for native lenses.


Nothing is obvious. Everything needs proof



May 13, 2012 at 10:06 AM
Jonas B
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p.1 #18 · OMD and 20mm f1.7


FlyPenFly wrote:
It's pretty common knowledge mft (panasonic in particular) does a significant amount of raw modification for native lenses.


I think you should watch out for both common knowledge and common sense then.

The banding issue seem very real though (I replaced my 20/1.7 with the 25/1.4 long ago so this is from reading all the posts about the problem). As I understand it it is about interference (recalling Canon having a similar problem a couple of years ago, no?) between that lens and the E-M5. What a pity for all those loving pancakes!

The problem hasn't been reported for any other lens yet.



May 13, 2012 at 10:06 AM
FlyPenFly
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p.1 #19 · OMD and 20mm f1.7


carstenw wrote:
Nothing is obvious. Everything needs proof

I'm sure you can google it.

The unmodified raw files for some lenses look insanely distorted and very CA heavy.



May 13, 2012 at 10:31 AM
carstenw
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p.1 #20 · OMD and 20mm f1.7


Well, if I would search for every unsubstantiated statement I came across, I would never have time for anything else I will file this factoid under your opinions for now.


May 13, 2012 at 11:13 AM
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