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12-10-2008, 03:29 PM   #16
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QuoteOriginally posted by stevebrot Quote
That software correction comes at a price...discard a few thousand pixels here, clone a few thousand pixels there. The results are usually acceptable, but probably not the equal of a good rectilinear lens. (I might set up a test for this. I could shoot with both my Zenitar 16 and my Tamron 28 with the same framing and correct the scanned image in PT lens. If I do it, I will post a new thread.)

Edit: While I could do such a test, it would still be "apples and oranges" since the edge resolution on the Zenitar (like most ultra-wides and fisheyes) is sub-par. I suppose I could do the Zenitar on digital and the Tamron on film...)

Steve
That test would be interesting indeed.

We've had a very good level of success using DXO with the Nikon D3 at the office. Images are usually printed at A1/A0 and still showing a great amount of detail (especially noticeable when you compare it to uncorrected D1x prints).

12-10-2008, 07:54 PM   #17
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QuoteOriginally posted by denisv Quote
To add insult to the injury, the same lens performs much better on FF than APS-C.

Remember, this is the same lens tested on a 24mp Full Frame and a 12mp APS-C sensor.

I think it's clear that in the context of sensors "bigger is better".
Thanks DenisV, for point this out. On the flip side, how do you explain this phenomenon on the Nikon System here:

http://www.dpreview.com/lensreviews/widget/Fullscreen.ashx?reviews=28,29&ful...=horizontal&&c
12-10-2008, 07:59 PM   #18
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QuoteOriginally posted by stevebrot Quote
That software correction comes at a price...discard a few thousand pixels here, clone a few thousand pixels there. The results are usually acceptable, but probably not the equal of a good rectilinear lens. (I might set up a test for this. I could shoot with both my Zenitar 16 and my Tamron 28 with the same framing and correct the scanned image in PT lens. If I do it, I will post a new thread.)

Edit: While I could do such a test, it would still be "apples and oranges" since the edge resolution on the Zenitar (like most ultra-wides and fisheyes) is sub-par. I suppose I could do the Zenitar on digital and the Tamron on film...)

Steve
I tried something like that once (Zenitar+K20D vs. Tokina 20-35 + 400 speed film).

defishing_examples Photo Gallery by troy at pbase.com

The defished digital images had greater resolution and better border illumination than the scanned film images. Flare and blown highlights (which I didn't try to correct) are more noticable in the defished image than in the film image; I'll let others worry about whether to blame the lens or the sensor (or the photographer).

I might try repeating this with higher-res film (Ektar 100) someday. . .

In my experience, for any lens that's even trying to be rectilinear, simple barrel distortion is correctible without much loss in resolution. More complex (moustache) distortion is much harder to correct, especially in an ultrawide zoom where you don't have an exact PTLens distortion model for the specific focal length used to take the picture.
12-11-2008, 12:59 AM   #19
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QuoteOriginally posted by denisv Quote
I think it's clear that in the context of sensors "bigger is better".
No, no it doesn't. There are MANY more factors here at play than simply the sensor size.

Its like saying 20" wheels go faster on red cars than blue, when ur red car happens to be a ferrari and ur blue one is a toyota!

12-11-2008, 02:08 AM   #20
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QuoteOriginally posted by stevebrot Quote
I use the Zenitar 16/2.8 as my wide prime...a good lens, but tricky to use.
Interesting, so this fish-eye (right?) doesn't just become a bad 24mm? Could you post some example shot?
12-11-2008, 09:41 AM   #21
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QuoteOriginally posted by leeak Quote
Okay, let me be more specific here. I came across this particular photographer's work on flickr and I am very impressed with this portrait shots with such contrast, bokeh composition ...

What do you guys think? Are our beloved Pentax cropped sensor capable of producing similar results?
Jumping in a bit late here, but it looks like you found msmelva and his beautiful girlfriend on Flickr. ;-) If you read his profile, he's an artist at heart, and you'll find that many of his images have been post processed very effectively to give a bit more. It's not an inherent advantage of his camera.
12-11-2008, 12:25 PM   #22
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Thanks krypticide for clarifying. I give MSM credit for his angles, lighting, and composition, but what captivates me most is his richness of his color. It almost borderline amines. Along with you and others have agreed that it's PP and not he gear that made the color the way it is, I just have to spend me time learning Photoshop.
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