lp/mm for CV lens?

Anton Caro

Member
Local time
10:12 AM
Joined
Oct 2, 2008
Messages
47
Location
Central Europe
Hello to everyone here,
I have a general question concerning the resolving power of the CV lens ...
Can you provide me a table or something similar for the collapsible Heliar 50/2, Heliar 75 and Nokton 40/1.4 MC - line pairs/mm - centre and edge?
Thanks!
 
I have a feeling you'll get a lot of responses telling you that they are "good enough" or that it doesn't matter or that there are so many other factors to consider (flare, contrast, distortion, build, etc.). Those responses will mostly be correct. RFs are typically used handheld and the lens is often not the weakest link in the sharpness chain.

To (sorta) answer your question, I found this:
http://web.archive.org/web/20040804...5.74/photography/lensTests/displayGraphs.html
It has results for the Heliar 75mm, but they do not state LP/MM numbers.

I have the 40/1.4 MC and I can tell you it gets considerably sharper at F2.0 and extremely sharp (for my purposes) at 2.8.

I've heard that Popular Photography magazine does quantitative tests of Voigtlander lenses, but I don't know if they've done the ones you mention.
 
Thanks for answering...
Well, I have some information about the lenses, the only small, tiny detail that still haunts me in my dreams and I do not know yet is the resolving power... and I wish I know it...
 
I used to test this sort of thing for the magazines, but gave up some years ago, originally because the magazines didn't pay enough to make all the work worth while.

Since then I've realized that it doesn't matter much anyway. Are you talking about aerial resolution, or on-the-film? If the latter, which film? What exposure and development (reduced exposure and reduced development both give higher sharpness)? What contrast is the target? What are your criteria for contrast in the image? Unless these figures are determined by the same person, using the same methodology, they can vary quite considerably, so although my figures are a useful comparison from one lens to another that I've tested, and someone else's figures are a useful comparison for the lenses they have tested, his figures and mine are not likely to be very comparable.

On-the-film figures are also grievously altered by film location. You will be lucky to see 125 lp/mm consistently on film, because film location is not sufficiently accurately repeated.

Finally, as demonstrated by both Ilford and Zeiss, the quality of 'sparkle' is high contrast at relatively low frequencies, which you can't easily measure at home.

Why, after all, do you want to know? Will it make you a better photographer? This is increasingly the criterion I use before I spend time, effort and money on acquiring extra kit or technical knowledge.

Cheers,

Roger
 
Thanks for answering...
Well, I have some information about the lenses, the only small, tiny detail that still haunts me in my dreams and I do not know yet is the resolving power... and I wish I know it...

you have those lenses in signature - does that mean you use them? i think there is not that kind of info available for cv lenses. also which of those three you like most. you can share your thoughts about these lenses with us. thanks in advance.
 
Thanks for your posts!
yes, I know on what the resolution depends... But as for some russian lens, where one can find data about the resolving power, I thought there could be something like this for the CV lens.
I am a keen film RFForumist and I have already come to the idea that it is absolutely not important the camera one uses, the idea that the photo conveys is much deeper than just demonstrating some technical equipment status. And then it occurred to me that it is not so important - MF SLR, large, etc... if there is no idea... then? So I stopped shooting on the heavy and slow Kiev and I witched to Bessa 3M. Of course I am waiting for the Bessa III, but there is again a general truth ... and it is that I cannot shoot with 2 cameras at the same time. And the Bessa 3M is enough for me.
I shoot on b&w dias processed by myself - predominantly on Foma R100 (which I expose as 320-400 ASA).
Pictures - tomorrow.
About the lens - Difficult question. kalejnar 135 mm is a miracle. I also like very much the Industar 61... it has its own spirit, not so high performance lens, but with personality... especially for black and white...
And the top is reserved for the Heliar Classic 1:2/50 mm collapsible... For b&w slides on f2 or f2.8 it gives astonishing results. With colour slides it is not so nice at open aperture as with b&w... Of course this is rather a personal feeling...
One "-" is that there are no half stops between 8 and 11 and no f22, which I consider a very big disadvantage.
 
can you maybe compare jupiter 8 and heliar. if you have jupiter of course. i was wondering how big is the difference between those two. also what framelines you use for nokton 40.

and of course - welcome to rff!
 
The Bessa R3M has a frameline for the 40 mm.
Should Jupiter 8 be the russian lens made for Zorki and Kiev? I shot with a Jupiter 1.5/50mm, but I could not find it attractive...
Dobre?
 
The Bessa R3M has a frameline for the 40 mm.
Should Jupiter 8 be the russian lens made for Zorki and Kiev? I shot with a Jupiter 1.5/50mm, but I could not find it attractive...
Dobre?


oh sorry i didnt saw its bessa r3m... what do you mean by dobre? - in serbian word "dobro" means good.
 
Back
Top Bottom