As long as were talking x-ray

[Tim k]

Does anyone care to voice an opinion as to which type of film seems to be working out better for general photography, or for high contrast applications such as carbon printing? Is there a type that seems to be rising to the surface, so to speak?

Thanks

[Vaughn]

And while we are at it,

What are the different qualities of the "Green" and "Blue" types?

[Mark Woods]

Hello Vaughn, I think you're talking about X-ray film? Do you mean the green sensitive v/s blue sensitive? And Tim, if you want contrast, the X-ray film developed in Dektol, or similar developer will give it to you quickly. I took Jim Fitzgerald's suggestion and use PMK for my 11x14 and D-76 for the other cameras in 4 gallon tanks.

Hope this helps.

[Vaughn]

My Agfa x-ray film is marked "Daylight", so I have not used any classified as green or blue like I have seen online.

I have been getting plenty of contrast using Ilford PQ Universal developer (1:9) -- will try one of the pyro developers "one of these days".

Vaughn

[Heespharm]

Check this thread:

http://www.largeformatphotography.in...highlight=Xray

Has information on the different types also ways to process it and such

[Tim k]

And while we are at it,

What are the different qualities of the "Green" and "Blue" types?

Vaughn, here is your answer;

5. What is the difference between blue and green sensitive film? Blue sensitive film is a 200-speed film that uses a blue emitting calcium tungstate phosphor screen for general-purpose radiography. Green sensitive film is a 400-speed film when used with a high efficiency green emitting gadolinium oxysulfide phosphor screen. Green sensitive film and screens use 50% less radiation than blue sensitive systems.

I copied it from here; http://www.sdssouthland.com/msdssharpimage.htm

Now if somebody could explain that to me? I'm good till about "200-speed".

[Tim k]

Heespharm, I have followed that thread. Thanks, there is a lot of good info there.

[Vaughn]

Tim, X-ray film , in its designed use, gets most of its exposure from the x-rays exciting a layer (and thus giving off light) behind the film in the film holder -- this layer then exposed the x-ray film... and not from the x-rays themselves. Think of it like the old black-light posters of the 60's and 70's, LOL!

I was interested if people have found the blue or the green better for general landscape work -- info I did not find in the other thread...but I might have just missed it.

My "daylight" x-ray film packaging mentions nothing about blue or green. In the sunlight, it seems to be as fast as 800ASA, but under the dense forest, its ASA drops dramatically -- and part of this may be due to a poor reciprosicity responce at longer exposures.

Vaughn

[Tim k]

I was interested if people have found the blue or the green better for general landscape work...

Vaughn

This was pretty much my question as well. I just asked in a more round-about confusing way.

[Mark Woods]

I use the green, but I've never tested the two different sensitivities side by side. If the film responds the way an electronic image does, the blue would not only be slower, but not a lot of natural scenes have a lot of blue in it -- except for the sky. Green on the other hand is in most colors at one level or another.