Re: Use of X-ray film: technical discussion with example images
Things I like about Xray film, other than cost. (green HR-U)
1. After processing, this film lies flatter than any film I've ever used (4x5), even though it's a bit thinner than normal photo film. Likely due to being equally coated on both sides. Open frame negative carriers in enlarger work OK. No need for single glass carriers.
2. Loss of sharpness compared with normal photo film is likely due to halation. This film doesn't scatter light very much but is very reflective compared with normal films. This favors use of very small f-stops like f-32 over larger, due to smaller cones of light. I get pretty good sharpness from 3x enlargements.
3. Develops nicely with low agitation. This allows semi-compensating developers to produce better sharpness. D23 at 1:7 dilution for 20 mins. at STP works well at ei 100 in Doran developing tank with 12 films at a time. Almost a stand development. Yankee tank would be similar.
3. Fixes quickly (5 min.) in low concentration plain fixer. I use about 30 grams sodium thiosulphate per 52 fluid ounces. This low concentration washes out very fast as well.
4. I remove films from tank after washing and hang to dry. Drying in tank holder takes too long, about 4 days, so I stopped doing that. Careful and slow extraction gives few scratches or mars along edges.
Alan Townsend
Re: Use of X-ray film: technical discussion with example images
Fujifilm UM-MA xray film.
Wehner Developer
Pre exposure with zone 2
Illumination with two LED light sources.
Rodenstock Aplanat 8/320mm @f/22
Ratio 1.2:1
Cutted 9x12cm sheets.
Sinar Norma 4x5
https://live.staticflickr.com/65535/...2b689b66_k.jpg
Re: Use of X-ray film: technical discussion with example images
Winter work!
Quote:
Originally Posted by
arri
Re: Use of X-ray film: technical discussion with example images
Arri,
How do you make the Wehner Developer? Are you developing the HRU as positives? This is eye opening.
So you are preflashing the XRAY film with a Zone II value? I imagine that would build up the toe.
Re: Use of X-ray film: technical discussion with example images
Re: Use of X-ray film: technical discussion with example images
Quote:
Originally Posted by
Tin Can
OK. I know Robert. Thanks.
Re: Use of X-ray film: technical discussion with example images
Quote:
Originally Posted by
Daniel Unkefer
Arri,
How do you make the Wehner Developer? Are you developing the HRU as positives? This is eye opening.
So you are preflashing the XRAY film with a Zone II value? I imagine that would build up the toe.
I´am using the standard B&W developer from Klaus Wehner, my stnadard, it works perfect for me with every film.
I tested the film with preflashing with different values. In this case Zone II gave the best results. it must be in relation to the contrast in the object. The same problem we have with every film but the xray film is working with more contrast. That´s why I´am using only uncoated lenses to lighten up the shadows and using pre exposure.
I have only tested it with this film, maybe the other xray films are working different.
In the early 1990th I used lith films with uncoated fast lenses like the Xenar 3.5/240mm and it were possible to get a grey scale with this extrem high contrast films.
I find it is much easier with a xray film.
Re: Use of X-ray film: technical discussion with example images
Quote:
Originally Posted by
Tin Can
Winter work!
It were bad weather work, we have had rain for over two weeks, it were ok, we need the water and I used the time for lens and film testing.
1 Attachment(s)
Re: Use of X-ray film: technical discussion with example images
AGFA mamoray HDR-C plus.
cut to 4x5.
ISO 50, Kodak D-23 1:4 6 min., 20 (ºC), in Jobo 2500 constant agitation.
Attachment 243007
Re: Use of X-ray film: technical discussion with example images
Quote:
Originally Posted by
Ivan Pisarev
Quite lovely.
