Forgot Password
Pentax Camera Forums Home
 

Showing results 1 to 3 of 3 Search:
Forum: Pentax SLR Lens Discussion 10-26-2016, 08:07 AM  
55mm/f1.2 Porst versus Revuenon writeup
Posted By kaipa
Replies: 16
Views: 3,495
Right. f/16 is similar to Cosina family lens (60cm MDF, 9 diagram blades, 58mm filter thread). f/22 is older Tomioka design (45-50cm MDF, 8 diagram blades, 55m filter thread). There could be some versions in the middle, probably. Older f/22 Porst version is more common.
Forum: Pentax SLR Lens Discussion 10-25-2016, 06:51 AM  
55mm/f1.2 Porst versus Revuenon writeup
Posted By kaipa
Replies: 16
Views: 3,495
Since I have Tomioka, I know what it is about )

The story is that m42 Tomioka was the first f1.2 lens for 35mm SLRs. It has been produced under different sub-names (Tomioka Cosinon, Tomioka Revuenon, Tomioka Tominon, Tomioka Chinon and Tomioka Yashinon). There is a good web site dedicated to this lens history: Preload Tomioka e main
I am the proud owner of multi-coated Tomioka Cosinon version, that is one of the rarest.

Later on Tomioka stepped off producing lens by its own name continuing to make glass and lenses as an OEM manufacturer. f1.2 lens design has been bought or licensed by Cosina and produced as K-mount Cosina Cosinon-S lenses and Porst. So, Porst is optically the same lens design as legendary Tomioka, though have lower quality contruction and probably lower quality glass. I tested Porst and Tomioka side by side -- the picture is very close.

Later on, Cosina has developed its own f1.2 design that we can see under names of Revuenon/Cosina/Rokinon/Vivitar in K-mount in two different exteriors. This lens have better contrast, but this plays back negatively in out of focus areas. Tomioka/Porst produce more dreamy images. Rumors say that glass for new Cosina lenses has been produced by Tomioka (actually, I've read it somewhere on the forum, most likely in f1.2 lens club thread https://www.pentaxforums.com/forums/122-lens-clubs/74819-post-your-1-2-photos-1-2-only.html)

So it is all twisted here and there.
Forum: Pentax SLR Lens Discussion 10-11-2016, 09:07 AM  
55mm/f1.2 Porst versus Revuenon writeup
Posted By kaipa
Replies: 16
Views: 3,495
Excellent analysis and comparison. I owned both lenses in the past (and now still have Tomioka 55/1.2 -- pre-Porst, and Vivitar 55/1.2 -- clone of Revue) and my impressions are similar to yours.
Search took 0.00 seconds | Showing results 1 to 3 of 3

 
Forum Jump


All times are GMT -7. The time now is 02:10 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top