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announced: Kipon medium format focal reducer
  
 
dickb
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p.2 #1 · p.2 #1 · announced: Kipon medium format focal reducer


This seems like a realistic assessment. Just like a regular speedbooster gives you near full frame quality on apsc for certain lens/camera combinations, having a good full frame camera is better. In the absence of an affordable medium format camera, these Kipon adapters may be an interesting route for some people. If you have a number of matching lenses, having both a regular and a 0.7x adapter gives you more options.

My first idea for such an adapter was for use with other lenses with large image circles, such as a Canon FD 400/2.8. This will probably result in an impractical amount of bodging, but it is the kind of experiment I like. Ideally I would like a EF to E mount speedbooster of high quality with a larger diameter, so it would be more useful for really fast lenses and full frame cameras.



Aug 05, 2016 at 04:11 PM
Lee Saxon
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p.2 #2 · p.2 #2 · announced: Kipon medium format focal reducer


jcolwell wrote:
Also at f/8 and infinity focus, the Mamiya A 150/2.8...


I met a guy on reduser who swore he'd tested multiple copies and the 150/3.5 was better than the A 150/2.8. Any comment? I've never tried one.




Aug 05, 2016 at 05:16 PM
jcolwell
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p.2 #3 · p.2 #3 · announced: Kipon medium format focal reducer


jcolwell wrote:
Also at f/8 and infinity focus, the Mamiya A 150/2.8...

Lee Saxon wrote:
I met a guy on reduser who swore he'd tested multiple copies and the 150/3.5 was better than the A 150/2.8. Any comment? I've never tried one.


I've owned both, at the same time. The IQ of the C 150/3.5 N is nowhere nearly as good as the A 150/2.8. Maybe that guy had a duff A 150/2.8.

P.S. it's possible that guy was refering to the Mamiya 645 AF 150/3.5; but if so, he must have been shooting on a Mamiya 645 AF body, as the M645 AF lenses don't have manual aperture rings.



Aug 05, 2016 at 05:58 PM
freaklikeme
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p.2 #4 · p.2 #4 · announced: Kipon medium format focal reducer


Gunzorro wrote:
Sorry -- forgot it was an Apo lens!


It's not. It has anomalous dispersion elements which I think is why it and the 120 Macro have such neutral bokeh. Both are well corrected lenses, though.



Aug 06, 2016 at 02:30 AM
RustyBug
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p.2 #5 · p.2 #5 · announced: Kipon medium format focal reducer


+1 @ well corrected / bokeh.


Aug 07, 2016 at 01:32 AM
taemo
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p.2 #6 · p.2 #6 · announced: Kipon medium format focal reducer


bumping this as I'm tempted on getting another A7 to use MF lens.
any experience/samples with Mamiya 645 or Pentax 645 lenses?



Mar 16, 2017 at 05:04 PM
 

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phuang3
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p.2 #7 · p.2 #7 · announced: Kipon medium format focal reducer


freaklikeme wrote:
It's not. It has anomalous dispersion elements which I think is why it and the 120 Macro have such neutral bokeh. Both are well corrected lenses, though.




Mamiya lenses are sort of bokeh engineered. They all look nice though.




Mar 21, 2017 at 12:48 PM
ZoneV
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p.2 #8 · p.2 #8 · announced: Kipon medium format focal reducer


zalmyb wrote:
why not a .5 reducer for pentax 67 lenses? that would be something. Id slap a 600mm f/4 on that thing and go to town.


I took this 0.7x Mamyia speedbooster, modified it and my Canon Fd 400mm f/2.8L and have now a 280mm/2.0 lens on Sony A7II :-)



Mar 22, 2017 at 10:51 PM
dickb
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p.2 #9 · p.2 #9 · announced: Kipon medium format focal reducer


ZoneV wrote:
I took this 0.7x Mamiya speedbooster, modified it and my Canon Fd 400mm f/2.8L and have now a 280mm/2.0 lens on Sony A7II :-)


Sounds great, exactly my plan. Is the IQ affected in any major way? Can you also use it on a FD 300/2.8? IIRC you also made a DIY version of such a speedbooster for your 400/2.8 over a year ago, is this Kipon version better? Thanks for the info.






Mar 25, 2017 at 09:58 PM
ZoneV
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p.2 #10 · p.2 #10 · announced: Kipon medium format focal reducer


dickb wrote:
Sounds great, exactly my plan. Is the IQ affected in any major way? Can you also use it on a FD 300/2.8? IIRC you also made a DIY version of such a speedbooster for your 400/2.8 over a year ago, is this Kipon version better? Thanks for the info.


It can be used with the FD 300mm f/2.8L as well.
The quality gos down, I think there is some added spherical aberration.

I only made a very short comparison with my other "homemade" speed boosters. At first glimpse the looked about the same quality at that easy 0.7 factor.
I have used them more at x0.5 or around that, where the quality was very different, much more spherical aberration and with this special bokeh.

Here some sample links with the FD 400mm f/2.8 and Kipon (both modified to work together):
https://www.flickr.com/photos/time-4-photos/31624961992/in/dateposted/
https://www.flickr.com/photos/time-4-photos/31624964122/in/dateposted/
https://www.flickr.com/photos/time-4-photos/32473895021/in/dateposted/
https://www.flickr.com/photos/time-4-photos/33271642956/in/dateposted/



Mar 26, 2017 at 07:33 PM
dickb
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p.2 #11 · p.2 #11 · announced: Kipon medium format focal reducer


Thanks, Markus. So x0.5 was a DIY focal reducer turning it into a 200/1.4? Impressive to say the least. Did the modification of the lens mean you kept the whole original optical scheme or did you fi. change the rear element?


Mar 27, 2017 at 07:48 PM
ZoneV
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p.2 #12 · p.2 #12 · announced: Kipon medium format focal reducer


Here I have some NSFW images I have made with such combinations - so not with the Kipon speedbooster, and not to typical Fredmiranda writers image quality levels:

Not Safe For Work
https://www.flickr.com/photos/time-4-photos/30081785461/in/dateposted/
https://www.flickr.com/photos/time-4-photos/30166037275/in/dateposted/



Mar 29, 2017 at 09:03 PM
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