"Admirable" blur samples

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"Admirable" blur samples

asbalyan
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p.17 #1 · "Admirable" blur samples

Anden wrote:
I think harsh to a certain degree is fine and sometimes useful but considering the close focussing distance in the above photos the result is very harch. The edges of the oof areas are very contrasty.

True... The highlights are not handled that great, esp for short distance. Oly 50/1.4 has better OOF blurs, but little bro is better in sharpness (although, I am using f1.4 more... but I am not happy with sharpness, which counts mostly for pixel peepers like us

)

This is (aperture) stepped down to around f5.6 (Oly 50mm f1.8), the lens is sharp and good OOF rendering (OK)... plus the lens is small enough to be used as camera cap..

Oct 30, 2008 at 07:08 PM

asbalyan
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p.17 #2 · "Admirable" blur samples

This week is festival week in India (and for most of Indians living outside)... had festival light few days back (Deepawali/Diwali)... captured the lights with Helios 85mm f1.5.
(what an over hyped crap

... During day times, My Tominion lens made for IBM photocopier lens creates the same impressions. The lens is good for show off and capturing low light shots. The lens diffuses the white light to the whole frame, and some people calls that haze... I am sure, this lens was not designed for Day photography).

But hell... if we can use photocopier lens or X-Ray machine lenses... why not this crappy one too,

[url=http://flickr.com/photos/asbalyan/2988746384/]

[/url]

Edited on Oct 31, 2008 at 06:48 AM · View previous versions

Oct 31, 2008 at 06:31 AM

Daniel Buck
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p.17 #3 · "Admirable" blur samples

I don't know why I didn't think to post these earlier, I took these last christmas, Aero Ektar 7 inch f2.5 lens on a Cambo SC-2 4x5

First shot shows almost the entire christmas tree, the 2nd shot was taken farther back, showing more of the area around the tree.

I think the lens was re-assembled incorrectly, it doesn't really focus properly, but I keep it because it gives some very strange results

Believe it or not, the close branches on the tree are actually in focus, but yet the bright highlights of the lights give a very strange bokeh/bloom around them as if they were not in focus. I think this is due to the misalignment of the lenses or something inside.

This image is copyrighted by the owner

Oct 31, 2008 at 06:39 AM

ovredal73
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p.17 #4 · "Admirable" blur samples

Daniel, Asbalyan, that´s great!

Oct 31, 2008 at 07:17 AM

Anden
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p.17 #5 · "Admirable" blur samples

Daniel! That is an awesome bokeh. Very useful in some applications.

A

Oct 31, 2008 at 08:16 AM

ulrikft
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p.17 #6 · "Admirable" blur samples

Really unreal and funky bokeh Daniel! Amazing

Oct 31, 2008 at 10:12 AM

Samuli Vahonen
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p.17 #7 · "Admirable" blur samples

Carl Zeiss Makro-Planar T* 2/100 ZF @ f/2 & f/11 (and no; there is no focus shift, I was just too optimistic when I focused the f/11 shot

, Zeiss has pretty narrow depth of field even at f/11)

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Samuli Vahonen
http://www.vahonen.com

Oct 31, 2008 at 07:06 PM

Silentlight
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p.17 #8 · "Admirable" blur samples

Beautiful bokeh on that 100/2 ZF at f2.

This is not mine, but I thought to share the knowledge. I am loving the rings in these pics. Lens is the Kilfitt 90/2.8 (the people who invented macro and zoom lenses).

http://www.flickr.com/photos/11069778@N08/2202014594/

http://www.flickr.com/photos/11069778@N08/2201223323/

(have to copy and paste the links)

Oct 31, 2008 at 11:20 PM

Daniel Buck
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p.17 #9 · "Admirable" blur samples

Samuli Vahonen wrote:Zeiss has pretty narrow depth of field even at f/11

lens brand has nothing to do with how shallow the DOF is, it's just focal length, aperture, focus distance and film size

Oct 31, 2008 at 11:26 PM

fourfa
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p.17 #10 · "Admirable" blur samples

theoretically that may be true. but I've definitely observed two lenses side by side - same focal length, same nominal aperture, same exposure, and same histogram - producing visibly different perceived DOF. It's easy to see how bokeh and edge-drawing differences can yield different perceived DOF. I could post examples I shot when I was evaluating a Canon 16-35II vs my Canon 17-40.

Note "perceived." There's some subjectivity here that's just not captured in a DOF chart, for whatever it's worth.

Nov 01, 2008 at 12:11 AM

Samuli Vahonen
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p.17 #11 · "Admirable" blur samples

Daniel Buck wrote:
Samuli Vahonen wrote:Zeiss has pretty narrow depth of field even at f/11

lens brand has nothing to do with how shallow the DOF is, it's just focal length, aperture, focus distance and film size

You are right, brand has nothing to do about it, but has a lot to do with lens design!!!! - Have you tested it yourself? I have shoot many times Carl Zeiss Makro-Planar T* 2/100 ZF and Canon EF100mm f/2.8 USM (and other comparable pairs of lenses) from same position while I have been comparing the lenses and it seems quite obvious to me that Zeiss has narrower depth of field at same aperture.

Here is one thread which has some answers:
http://www.fredmiranda.com/forum/topic/666807/0

Also some other people seem to have found the same on other threads as well:
http://www.fredmiranda.com/forum/topic/684609/0#6157256
http://www.fredmiranda.com/forum/topic/574990/0#5909507
http://www.fredmiranda.com/forum/topic/517227/0#4468592

Also if you look at:
http://en.wikipedia.org/wiki/Depth_of_field#Derivation_of_the_DOF_formulas
You will find out that the DOF formulas are made for single lens element symmetrical lenses, which are very far away from modern lens photographic lens designs. Also if you go to depths to this issue I would propose following document as well:
http://www.largeformatphotography.info/articles/DoFinDepth.pdf

Also like fourfa says above there is difference between mathematical MTF DoF and apparent/perceived DoF. Which I'm referring, I have never tested my lenses with artificial targets, I prefer real outdoor shooting instead... Somehow Zeiss lens designs seems to concentrate the contrast to focal plane and has then less contrast on areas which are not in focal plane. Hard to define on my 2nd language this kind of things

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Samuli Vahonen
http://www.vahonen.com

Nov 01, 2008 at 12:22 AM

thrice
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p.17 #12 · "Admirable" blur samples

Silentlight wrote:
Beautiful bokeh on that 100/2 ZF at f2.

This is not mine, but I thought to share the knowledge. I am loving the rings in these pics. Lens is the Kilfitt 90/2.8 (the people who invented macro and zoom lenses).

http://www.flickr.com/photos/11069778@N08/2202014594/

http://www.flickr.com/photos/11069778@N08/2201223323/

(have to copy and paste the links)

Incredibly distracting but awesome to look at

I really like the look, it's nisen-bokeh taken to the extreme, as if one bright ring around OOFH wasn't enough this lens adds another one just for good measure

This image is copyrighted by the owner

Nov 01, 2008 at 02:46 AM

thrice
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p.17 #13 · "Admirable" blur samples

I just noticed that if I don't mind taking 100% crops the bokeh from my lil pentax looks a lot better. Usually I get quite a bit of the bright-ring effect, but if I take a crop - like this one from the edge of an image - it looks more like my 135/2L bokeh.

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Nov 05, 2008 at 01:44 PM

ovredal73
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p.17 #14 · "Admirable" blur samples

Thrice, thats a 100 percent crop? Thats a amzing. What lens? At what aperture?

André

Nov 05, 2008 at 04:31 PM

thrice
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p.17 #15 · "Admirable" blur samples

It's a 50% crop, sorry. It's the SMC Pentax-A 50/1.2 at f/2.0

This is 100%:

This image is copyrighted by the owner

This is the whole image (was testing bokeh):

This image is copyrighted by the owner

Nov 06, 2008 at 05:19 AM

asbalyan
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p.17 #16 · "Admirable" blur samples

Samuli Vahonen wrote:
............but has a lot to do with lens design!!!! -......

.................it seems quite obvious to me that Zeiss has narrower depth of field at same aperture.
...........
--
Samuli Vahonen
http://www.vahonen.com

When I used CZ Planar 50mm f1.7 first, this was the first thing I noticed. Planar 50/1.7 had very narrow/shallow DoF compare to my other 50mm(s) esp Canon AF 50/1.8.

I am not sure about reason, and but sometimes I think, Planar focusing plane fall-off is more sharper than other design.
(Its discussed at Manual focus forum about a year back... but difficult to find the thread now)..

Nov 07, 2008 at 10:50 PM

cogitech
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p.17 #17 · "Admirable" blur samples

Agreed. The lack of DOF in that shot is due to the close focusing distance.

Nov 07, 2008 at 10:56 PM

ovredal73
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p.17 #18 · "Admirable" blur samples

thrice wrote:
It's a 50% crop, sorry. It's the SMC Pentax-A 50/1.2 at f/2.0
This is 100%:
This is the whole image (was testing bokeh):

Still great bokeh and rendering for that tight. I have been looking at that lens. You like?
André

Nov 07, 2008 at 11:34 PM

Herjulfr
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p.17 #19 · "Admirable" blur samples

I took this today with a 350D and a Canon 50mm FD @ f1.8 :

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Nov 07, 2008 at 11:41 PM

asbalyan
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p.17 #20 · "Admirable" blur samples

cogitech wrote:
Daniel Buck wrote:
Samuli Vahonen wrote:Zeiss has pretty narrow depth of field even at f/11

lens brand has nothing to do with how shallow the DOF is, it's just focal length, aperture, focus distance and film size

Agreed. The lack of DOF in that shot is due to the close focusing distance.

Focal Length doesnt impact DoF... Its a pure function of Aperture, Distance and Sensor type.

And I am not saying different DoF, I noticed the different fall off of focusing plane... after all, focusing plane is nothing but circle of confusion.. and very vague term...

Again... not a point of discussion for this thread... lets see more blurs...

Nov 07, 2008 at 11:49 PM

Daniel Buck
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p.17 #21 · "Admirable" blur samples

asbalyan wrote:
Focal Length doesnt impact DoF... Its a pure function of Aperture, Distance and Sensor type.

technically I think you are correct, no it doesn't. But if you aren't blowing up cropped areas of photographs and such for technical comparisons, then I think yes focal length does appear to aid in 'impacting' the look of DOF for most practical purposes?

Nov 08, 2008 at 12:01 AM

asbalyan
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p.17 #22 · "Admirable" blur samples

Daniel Buck wrote:
............. 'impacting' the look of DOF for most practical purposes.....

you are right... These are the correct words... focal length impacts the "look" of DoF...

But even in practical case, it doesnt...

http://www.luminous-landscape.com/tutorials/dof2.shtml

And geeks, (mathematically can be proved),

http://www.normankoren.com/Tutorials/MTF6.html (my fav site... My gateway to digital photography... root of my Picture Window pro usage...

)

But as you mentioned, "...impacting the the look..." , its all about CoC, which depends upon multiple factor..

There is one more catch... (these are words from second link)...

Of course the actual image sharpness at the DOF limits is degraded by diffraction, lens aberrations, film properties and possible lack of film flatness, so the overall sharpness at the DOF limits will be inevitably worse than the simple circle of confusion would indicate. For this reason alone, the standard for setting the circle of confusion is a bit loose.

Nov 08, 2008 at 03:38 AM

olyacme
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p.17 #23 · "Admirable" blur samples

The thread seems to have bogged down in technical correctness for a bit, so how about some more examples of the OMZ 90/2's neutral blur property to restart it?

Cornflower is at f/2.8, little mushroom at f/5.6. Both on a 4/3" sensor.

Nov 10, 2008 at 08:31 AM

Anden
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p.17 #24 · "Admirable" blur samples

Nice ones. The 90 is a great lens!

A

Nov 10, 2008 at 08:36 AM

Paul Yi
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p.17 #25 · "Admirable" blur samples

Nov 10, 2008 at 03:35 PM


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