Originally posted by Gerard_Dirks Last week I had a discussion with a Nikon Photograph who tried to tell us that we need to buy new glass when using the new highend fullformat cameras.
I complained. In analog time we had the kodachrome 25 slide film. Comparing with modern Cameras this film has a resolution of about 60Mpx. The D850 has 45Mpx, the K-1 has 36Mpx, so plenty possibilities to use old glass!
Maybe he meant that as far as Nikkor glass was concerned . . .
My last rolls of Kodachrome were the 25 speed but I never got to test it properly. However, I tested some of my lenses using Kodak Techpan @ ISO 25 and processed in Kodak Technidol and clearly the results indicate far more resolution then a 36.3MP.
In this test, I used a Pentax M 50mm f4 macro lens on my Pentax LX to take a shot of a 4 X 4 arrangement of 12233 res charts under optimal conditions. I then "scanned" the whole frame of film using my Pentax K20D+macro+autobellows, Nikon D800+macro+autobellows and Coolscan 9000 and show the 100% crops from each on the left hand side. The D800 and Coolscan results are very close even though the D800 has more pixels then a 4000dpi scan. However, to the right I used my K20D+macro+autobellows to capture about a 4.5X optical magnification of the center area and it is plain to see there is far more real detail captured on the frame of Techpan that has not been resolved by these methods.
Full res version ->
Kodak Techpan 04-27 scan compare
And looking at DPREVIEW's results from the D850, it certainly looks like it is still not resolving the detail captured on Techpan. And this is using a lens I bought off a local craigslist for cheap so I am not sure if this lens is still in optimal condition. In fact I am not sure what is the limiting factor here - lens, film, manual focusing or a combination of these factors.
In any case, this lens - as well as the others I have tested that are all used, are not going to be the limiting factor in attaining all the detail of a scene.
---------- Post added 10-27-17 at 11:39 PM ----------
Originally posted by zjacreman I recently had a studio portrait session using the K-1 with m42 primes. Super Tak 85mm 1.9 (1960s) and Jupiter-9 (1969) primarily, and a few shots with my Helios 44m-5 (1999 model of a very old design) and Mir-24m (1984).
Beautifully done!
---------- Post added 10-28-17 at 12:17 AM ----------
Originally posted by Digitalis My personal exemplar of this is the SMCP-K 50mm f/1.2 - it is not the sharpest 50mm lens pentax has ever made, at f/1.2 its resolution characteristic is abysmal,Stopped down f/5.6~f/11 the 50mm f/1.2 really hits its stride, and performs admirably.
This is a lens I have that I also tested and would appreciate comparing your results with mine.
BTW, did you test your lens with other f1.2 lenses?