Re: Q FOR THE OPTICAL GENIUSES
- To: email@example.com
- Subject: Re: Q FOR THE OPTICAL GENIUSES
- From: sam wang <firstname.lastname@example.org>
- Date: Fri, 27 Apr 2007 10:50:42 -0400
- Comments: "alt-photo-process mailing list"
- In-reply-to: <!&!AAAAAAAAAAAYAAAAAAAAAIsdeRRYKtgRkfoAENz0NV7CgAAAEAAAALr6dGFNlAxFt1p4EMJbpHkBAAAAAAemail@example.com>
- List-id: alt-photo-process mailing list <firstname.lastname@example.org>
- References: <!&!AAAAAAAAAAAYAAAAAAAAAIsdeRRYKtgRkfoAENz0NV7CgAAAEAAAALr6dGFNlAxFt1p4EMJbpHkBAAAAAAemail@example.com>
- Reply-to: firstname.lastname@example.org
One of the resident optical geniuses is off to a photo trip in Spain
(Sandy), so I'll try to answer instead.
The Dagor is sharp, but its coverage is what gave it special
reputation. At your bellows draw, you would be using just the center
of the image circle. So, the APO is probably the one to use.
Have you thought of capturing your subjects with your scanner? Here
is an article about the folks at the Smithsonian doing just that with
You can then make digital negatives of any size, for pt/pd,
cyanotype, gum, or whatever.
On Apr 27, 2007, at 9:42 AM, BOB KISS wrote:
This is for those who REALLY know their optics.
I have a 210 mm Goertz gold dot Dagor and a 210 mm Schneider Apo
lens. I want to do some EXTREME close up photos of dried leaves,
alia, on 8X10 to make contact PT/PD (see it IS on topic). I know
of these lenses will cover the 8X10 format at this bellows
extension and I
am using this focal length to keep from having to stretch my bellow
as I would with a longer focal length lens.
**********NOW MY QUESTION: Which of these two lenses would give me
results in terms of detail and contrast at this magnification
Please check my website: http://www.bobkiss.com/
"Live as if you are going to die tomorrow. Learn as if you are
live forever". Mahatma Gandhi