- Joined
- Mar 25, 2005
- Messages
- 742
- Format
- Multi Format
Michael,
That's interesting as far as having full correction at one stop down below wide open. Usually, for normal lenses, ultimate performance is two stops from wide open.
What's the maximum aperture of your APO lenses? I checked the available 50mm APO lenses available today, and it seems that Rodenstock makes a 50mm f/5.6. That is too slow for me many times. My preferred aperture is f/4, which usually gives me printing times that are good for dodging and burning, split contrast printing, etc. I use a metronome as a timer, so I need full seconds to get precision. To be in the 30-45s range is ideal for me, and gives me perfect repeatability.
But if there were f/2.8 APO lenses, and I could see a significant quantified difference at 16x, I might get one.
My 50 apos are f2.8
80 apo are f 4
90 apo are f 4
150 apo are f4
never heard of a apo 50 at f 5.6
You might want to read what Ctein has to say about enlarging lenses in his book Post Exposure. You may not need to drain that photo bucket after all.
Post Exposure recently became a free download here:
http://ctein.com/booksmpl.htm
In addition to the lens ratings, he deals with a lot of the resolution issues that are relevant to this discussion (and uses a higher resolution standard than most discussions, which helps to differentiate the issues).
Bob Carnie enlarged 30x40 (murals) and 20x24 (prints) for documentary photographer Ryan Pyle's
"Chinese Turkistan Series" from his 35mm negatives. Bob, are the photos of this series on your
website the actual murals/prints?
Jamusu.
Go here and click on portfolio to see some of the work: http://www.elevatordigital.ca/deg/?ryan
I haven't seen any of Bob's murals, but I have seen some of his standard large prints up-close, and I will trust just about anything he says, because they are spectacular works. That experience of work, spanning decades, printing for others, 30x40" and larger, over and over again, speaks volumes to me. It isn't experience and knowledge that is easy to come by.
You guys are giving me a complex about my converted Omega DII than I retrofitted with the dichroic head.
People are talking about 20x24 and 30x40 prints from 35mm negatives. That's fine for them, but there is no way I would consider the image quality in such prints acceptable for my photographs. Before people jump all over me, to be clear I'm not talking about printing skill here. I'm talking about the limitations of the format. It is all about personal preference.
Do autofocus enlargers actually have electronic focus adjustment like autofocus cameras?
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