Yeah, so it’s not about the development method. Cutting the strips and placing them into the 4x5 film holder in total darkness is time consuming and difficult. It’s also easier UNloading them with a little light.
Don't bother with a safelight. Trust the time/temp development method.
Most of our "red" safelights aren't actually ortho film safe red safelights.
View attachment 346424
I checked and the filter is indeed a gbx-2.
And the film may require a 2.
And the film may require a 2.
Yeah, looks like according to the chart, a 2 may be recommended. But I did the coin test, exposing up to 3 minutes and got no visible image on the film…
Did you first fog the film very slightly, before doing the test? That is critically important, especially for a lot of ortho materials.
To lightly fog a bit of the film, take a 2 stop under-exposed picture of a mid-tone surface, then do the coin test on that.
With photographic paper, we just do a test strip and determine what exposure results in a light grey, then pre-expose a safelight test sheet with that amount of light before doing the test.
Thanks. My darkroom access is limited, so I had to go ahead earlier today and try the test again, just guessing on how to flash the film without overexposing it. So I just flashed an incandescent light on for a fraction of a second, but that was too much and the strips I flashed came out black.
I won’t have a chance to redo the test for a while (again, limited darkroom access), but I did develop my camera exposures, and it looks the best frames were underexposed two stops from iso 80, so 320. So that would explain the overexposure I was originally inquiring about.
Matt in the chart you supplied Kodak makes a distinction between a 2 and a GBX-2, the latter being designed for most blue and green sensitive medical X ray film with an apparent common link of green sensitive X ray films but no mention of fast orthochromatic film. However on googling all sources including a number of Photrio members seem to state that the GBX-2 is OK for fast orthochromatic film as well. This is puzzling and would appear to exclude the GBX-2 from fast orthochromatic and render it at least a risk if not completely unsafe for fast orthochromatic film
Is there any kind of a link that makes a filter that's safe for most green sensitive X ray film automatically safe for fast ortho film?
pentaxuser
I'm afraid with Kodak the X-ray film division, and the graphic arts film division and the continuous tone pictorial film division didn't ordinarily compare notes and issue common recommendations. In the past, you normally couldn't even buy those materials from the same sources - those with dealership status in one line didn't have access to the catalogues for the other products and had no way to order them.
The practice in modern times to re-purpose materials designed for radically different uses is quite new.
So can I take ít that your conclusion is that there is no way of being sure that for fast ortho film GBX-2 will be definitely be suitable. It may or may not be different from a Kodak 2.
What do you make of various statements that GBX-2 is OK?
It was just that Jimi3 seems to be on the horns of a dilemma about GBX-2 and my question to you and your answer might help him but I accept that in some cases you can't always give a definite answer and this looks like one of them
pentaxuser
Depending on your pocketbook, nerdiness, and love of stuff, you might consider IR goggles and an IR light source to work with.
Even with the Dark Red filter, Ilford still recommends 15W, a minimum of 4 feet away, and less time as possible. Good luck!
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?