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03-07-2015, 10:41 PM   #1
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Super-Takumar 200?

I have had a bit of fun comparing the Super-Takumars 6X7 4/200 and the 2.4/105 with the Rear Converter 2X—effectively a 5.6-45/210 and shot some test shots moving through the apertures to check out the sharpness, DoF and CA, which is best for what? This is done on my K-7 and off course the sharpness, DoF and everything will look different on a 6X7 camera, but still educational with a center crop. Have a look here (there is also ‘Original‘ size versions for pixel peeping): https://www.flickr.com/photos/32108329@N08/sets/72157651225799075/
(I will attach one panel to illustrate, but the 1200px max limit here is not enough detail to make sense)
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Last edited by jt_cph_dk; 03-07-2015 at 10:46 PM.
03-08-2015, 06:51 PM   #2
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Given that the 105 and the 2X TC are so well corrected, I'm thinking that combination will match the 4 element 200mm in sharpness. The newer 200 Pentax used the same design type as the 180mm Elmarit made for the Leica R series.
03-09-2015, 07:20 AM   #3
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QuoteOriginally posted by desertscape Quote
Given that the 105 and the 2X TC are so well corrected, I'm thinking that combination will match the 4 element 200mm in sharpness. The newer 200 Pentax used the same design type as the 180mm Elmarit made for the Leica R series.
Im surprized, that the TC actually does reduce the sharpness a little bit—or perhaps it is caused by some shake? It is really a front heavy rig prone to shake. I focussed with Live View (zoom x3) and took all the shots with a 12sec delay with the K-7 mounted on tripod. So, it should be as good as possible. Except, that I didīt use mirror lock up and even with the K-7, that would produce a minor mirror shake?
And YES, that latest version is one, that I want to get, especially since itīs so cheap now, Iīve just seen two of them in great or excellent shape on ebay for little more than a hundred US! Next to nothing. Absurd almost.
But I would keep the old one still, because it has such special image characteristics, renders like a dream, I love the old Super-Takumars, they have something quite unique about them.

Last edited by jt_cph_dk; 03-09-2015 at 08:11 AM.
03-09-2015, 07:30 AM   #4
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Here is what I mean with rendering like a dream ...

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03-10-2015, 05:03 AM   #5
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QuoteOriginally posted by desertscape Quote
Given that the 105 and the 2X TC are so well corrected, I'm thinking that combination will match the 4 element 200mm in sharpness. The newer 200 Pentax used the same design type as the 180mm Elmarit made for the Leica R series.
Have a look at this comparison, Steve, I have taken it at ISO100 and double-checked for shake: There is none present.



https://www.flickr.com/photos/32108329@N08/16774121105/sizes/k/
03-10-2015, 12:23 PM   #6
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....Although at those small stops, there is going to be enough diffraction to make a comparison somewhat ineffective.
03-11-2015, 01:52 AM   #7
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QuoteOriginally posted by desertscape Quote
....Although at those small stops, there is going to be enough diffraction to make a comparison somewhat ineffective.
My conclusion here is, that the 2X converter does not degrade the image. In fact, it produces a magnification, that is better, more sharp, than the 200% crop (bottom row). Actually the very slight shake (a 4-5 pixel vertical movement, that I can see on the RAW file in Photoshop) in the f:11 photo shows the tiny tolerances, that we are talking about here: 5X5 pixels out of 4672X3104 avaliable is enough to produce a blur that makes the difference.

[IMG][/IMG]

Last edited by jt_cph_dk; 03-11-2015 at 02:38 AM.
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