I have 36 inch of workable bellows ... I am using an old century camera with no shutter, its light tight as I have gone through a few boxes of film as late as last sunday.
Quote:
Originally Posted by Dan Fromm
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I have 36 inch of workable bellows ... I am using an old century camera with no shutter, its light tight as I have gone through a few boxes of film as late as last sunday.
Quote:
Originally Posted by Dan Fromm
I have a 240 , 180 , 150 mm enlarger lenses that I could use, I also have a 150 mm camera lens.
Would any or all of these work?
Quote:
Originally Posted by jimgalli
Well, the magic rule is: extension (distance from lens' rear node to film plane) = focal length * (1 + magnification). So the longest lens you can use is 9" and a bit shorter would probably be better. For most lenses, the rear node is near the diaphragm.Quote:
Originally Posted by Bob Carnie
There's another magic rule, to the effect that if the lens is intended to be used at magnifications below 1:1 (that's all taking and enlarging lenses) it should be reversed when used at magnifications > 1:1. The big exceptions are symmetrical (with identical front and rear cells) lenses; this includes Apo-Saphirs (heliar type), some, perhaps not all, dagor types and most if not all dialyte type process lenses.
Good luck, have fun,
Dan
I have a Fujinon CM-W 180/5.6 in a Copal #1 available in EXC condition for $395 including shipping in CONUS.
It's an almost-symmetrical design of six elements in five groups. It takes 67mm filters.
Here's a schematic drawing of the lens: http://www.mayadate.org/pix/Fujinon_CM-W.png
This is the later EBC-coated version with lettering on the outside of the barrel.
The IC is 260mm @ infinity (8x10 diagonal is 325mm), so it will cover a range of close-up work, not just 1:1.
It would even work @ infinity with vignetting of the corners.
FFL is 170.7mm, so 1:1 requires a bellows draw of 170.7+180 = 350.7mm (13.8").
I can provide photos if you're interested in it.
- Leigh
Hi Dan,Quote:
Originally Posted by Dan Fromm
Not meaning to quibble, but...
If you use 1:1 as the close-focus limit, your maximum lens FL is about 1/2 the bellows draw, which would be 18" in this case.
The other 2xFL (@ 1:1) is in front of the lens and is not involved in the bellows draw calculations.
- Leigh
Leigh, he wants to go to 3:1Quote:
Originally Posted by Leigh B
OK. I find no mention of 3:1 earlier in the thread.
- Leigh
See post #18 in this thread.Quote:
Originally Posted by Leigh B
Dan "none so blind as he who does not want to see" Fromm
This is getting quite confused.Quote:
Originally Posted by Dan Fromm
Post #18 is by Bob Carnie, not the OP, and he does not mention a 36" bellows.
Jim Galli mentions a 36" bellows in his response to Bob's post, again not the OP.
My post was directed at the OP's original question. (Apologies for trying to stay on-topic.)
- Leigh
See posts 18, 19, 21, 23. The OP is long gone, Bob Carnie and I have been discussing Bob's situation. Threads drift. Live with it.Quote:
Originally Posted by Leigh B