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You're absolutely right! That is why I use the "effective aperture" phrase... ;)

Thanks!

In my case the aperture diameter can be determined. :)
238885

Hi there!

I'm a bit confused...

The aperture size is f=F/d where F is the focal length, and d is the lens diamater. Right? :)
The bell extension factor is used when you extend the bell far...

It's my... Not nice. Not portable friendly. But usable and cheap ;) The whole budget was about 50 bucks (without the brass lens)...
13x18 and 18x24 back, booth are roundable by 90 degree.
All...

Hi there!
I finished my DIY camera, and take some shot to xray films.
Yesterday was a contact day to me...

http://farm8.staticflickr.com/7648/16974444772_54528bc33b_z.jpg
DIY monorail camera,...

George!
It is possible you are misswrote the receipt? Or it's an 1:1000 dilution?
My stoeckler D-23 receipt is same as you wrote but in grams instead milligrams...
Thanks!

I don't sure... The old receipts are different the modern receipts. My 5 years ago opened Rodinal did crystallized and can't dissolved again perfectly even on higher temperatures... So I guess it's...

Yes it seems like a good exposure (just see the grey scale and the rates of highs and lows), but anyway I think the negative is slightly underdeveloped (thin). I guess this kind of film (PRIMAX...

After I revisited my whole process finally I've got a nearly good x-ray photo... (relatively to the previous).

Primax RTG-G green latitude film @ ISO50...

Sergei! I just wondered about your photos! :) I did read your test with Rodinal vs Pyrocat and it's convinced me.
There was a big mistake by me when I did my own developing tests: I forget the fact...

Thanks! :)

Thank you very much premortho!
The main key what help me to reaching better results is that: after development the x-ray negative is have to look like an ordinary negative! That was my first...

Hi there!

Does anyone have any experience with KODAK MIN-R S mammo film or ORWO HS-11 film? I just got a box each other by gift.

I did read the full thread (really!). I tried to develop that...