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D1N0
Joined: 07 Aug 2012
Posts: 2535
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 Posted: Tue May 31, 2022 3:33 pm Post subject: |
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D1N0 wrote:
| eggplant wrote: |
Still not finished my scanning setup, but here's the diagram with my phone. Doesn't look like any Tokina or Vivitar I've seen
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Looks more like the Super/S-M-C Takumar design which is 3.5 of course.
source Pentaxforums.com
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D1N0
Joined: 07 Aug 2012
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| Posted: Wed Jun 01, 2022 1:07 pm Post subject: |
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D1N0 wrote:
Well I couldn't restrain myself, but they are cheap so what the hell. Seller Pic:
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pentaxian |
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D1N0
Joined: 07 Aug 2012
Posts: 2535
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| Posted: Fri Jun 03, 2022 11:21 am Post subject: |
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D1N0 wrote:
| eggplant wrote: |
| I didn't comment before, but I consider the optical design to be different. The second airspace in the Takumar is meaningfully larger. |
It was always going to be different since the Rikenon is 2.8. The space between the third and rear is larger in the Rikenon and the sonnar-like third element looks a bit more convex, as does the rear element. Probably because it is closer to the mount it has to project a bit wider. But it looks very much derived from the Takumar design.
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pentaxian |
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D1N0
Joined: 07 Aug 2012
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| Posted: Fri Jun 03, 2022 12:58 pm Post subject: |
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D1N0 wrote:
Well it is a nice lens, sharp wide open and pleasing bokeh. Just suffers from colour fringing in high contrast areas as can be seen in this shot.
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D1N0
Joined: 07 Aug 2012
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| Posted: Fri Jun 03, 2022 4:14 pm Post subject: |
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D1N0 wrote:
Test series cropped F2.8,f3.5(ish between 3.8 and 4 since there is no half stop) F4 and F5.6 You can see contrast improving and fringing getting slimmer. Focus is on the tuning scale which is a bit receded
#1 2.8
#2 3.5
#3 4.0
#4 5.6
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D1N0
Joined: 07 Aug 2012
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| Posted: Wed Apr 19, 2023 9:47 am Post subject: |
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D1N0 wrote:
real world shot. Colour fringing is not a problem here. I didn't correct for it
 conekeh by The lens profile, on Flickr
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pentaxian |
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D1N0
Joined: 07 Aug 2012
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| Posted: Wed Apr 19, 2023 9:57 am Post subject: |
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D1N0 wrote:
Nor is it here:
 Duck Pose by The lens profile, on Flickr
or here while there is a lot of brightness and contrast
 Scruffy Duckeh by The lens profile, on Flickr
You need more extreme situations to show it up, like here where the wood crosses with the oof highlights in an essentially backlit situation.
 Bokeh balls by The lens profile, on Flickr
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Pancolart
Joined: 04 Feb 2008
Posts: 3705
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Wed Apr 19, 2023 9:58 am Post subject: |
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Pancolart wrote:
Looks great. I know the series, really high quality built.
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