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Archive 2023How long do you think a latent image lasts on undeveloped film?
p.5 #1How long do you think a latent image lasts on undeveloped film?
First roll of 25 yr old Neopan 1600 shot in the Nikon LiteTouch AF. This camera is DX only, but it only has ISO settings for 100, 200, 400 and 1000. Anything DX coded differently than that is allocated one of those settings. Weird thing is it is all over the place - for instance 1600 is not rated 1000 which is the next closest so seems logical, but is rated at 400!
Anyway, so I picked the little Nikon because it is tiny, has a fantastic 28mm lens, and would give the film 2 extra stops. The roll loaded in my MP is being shot at three over at ISO 200, which looking at the results below, seems like it would be a lot better. I'll see after I develop that.
Anyway, so I picked the little Nikon because it is tiny, has a fantastic 28mm lens, and would give the film 2 extra stops. The roll loaded in my MP is being shot at three over at ISO 200, which looking at the results below, seems like it would be a lot better. I'll see after I develop that.
Dec 07, 2023 at 02:16 PM
p.5 #2How long do you think a latent image lasts on undeveloped film?
I find that 'drop off only' image oddly humorous.
Dec 07, 2023 at 04:08 PM
p.5 #3How long do you think a latent image lasts on undeveloped film?
rscheffler wrote:
I find that 'drop off only' image oddly humorous.
I'm trying to think what could have caused that chunk of stucco to drop off. It is about 15-20 ft up. Maybe a tractor-trailer aka 18 wheeler delivery rig that misjudged his boundaries?
I find that 'drop off only' image oddly humorous.
I'm trying to think what could have caused that chunk of stucco to drop off. It is about 15-20 ft up. Maybe a tractor-trailer aka 18 wheeler delivery rig that misjudged his boundaries?
Dec 07, 2023 at 09:12 PM
p.5 #13How long do you think a latent image lasts on undeveloped film?
Oldwino wrote:
https://petapixel.com/2023/12/12/134-year-old-photo-is-the-oldest-to-ever-be-developed/?fbclid=IwAR172Wmq2rFV4bFNhQr78zh_G3yZui7N673cnElKxrMu4wlIyf606SmKCFk_aem_AWopOiYgzUX8e1HTv1MFvt5nOqKVywZbNPWaQ-lpqmsCMJ24Abxy4r1BHOwBhY3oNas
Despite the team’s expertise in film development and the 100 exposures that are possible on the film, only one negative came back with anything recognizable.
Shoulda used DF96 Monobath.
https://petapixel.com/2023/12/12/134-year-old-photo-is-the-oldest-to-ever-be-developed/?fbclid=IwAR172Wmq2rFV4bFNhQr78zh_G3yZui7N673cnElKxrMu4wlIyf606SmKCFk_aem_AWopOiYgzUX8e1HTv1MFvt5nOqKVywZbNPWaQ-lpqmsCMJ24Abxy4r1BHOwBhY3oNas
Despite the team’s expertise in film development and the 100 exposures that are possible on the film, only one negative came back with anything recognizable.
Shoulda used DF96 Monobath.
Dec 12, 2023 at 10:44 PM
p.5 #14How long do you think a latent image lasts on undeveloped film?
Next up, Agfapan APX 100
While this film is currently being produced, I'm going to assume it is of the same vintage as the rest of the stash, and 'stored' similarly. The one roll of APX 25 that was in the stash was a complete disaster, but this is the 100, so I'm hoping things will be better.
There are five rolls, so I'm hoping this one sacrificial/test roll that I am rating at ISO 25 will give me an idea if the rest can be used.
While this film is currently being produced, I'm going to assume it is of the same vintage as the rest of the stash, and 'stored' similarly. The one roll of APX 25 that was in the stash was a complete disaster, but this is the 100, so I'm hoping things will be better.
There are five rolls, so I'm hoping this one sacrificial/test roll that I am rating at ISO 25 will give me an idea if the rest can be used.
Dec 15, 2023 at 01:22 PM
p.5 #15How long do you think a latent image lasts on undeveloped film?
APX 100 shot, developed, drying. Negs look decent at first glance.
Dec 15, 2023 at 06:52 PM
p.5 #17How long do you think a latent image lasts on undeveloped film?
Looks good. The blank APX25 still baffles me. Maybe the little silver there was in that emulsion just evaporated over time? 
Dec 18, 2023 at 05:32 PM
p.5 #18How long do you think a latent image lasts on undeveloped film?
rscheffler wrote:
Looks good. The blank APX25 still baffles me. Maybe the little silver there was in that emulsion just evaporated over time?
It wasn't 'blank blank' but I could only see very faint images. So almost blank. Which is unusual as usually the slower the film, the longer it lasts. But it seems like it may now be an ISO 1 or 2 film.
The APX 100 looks like it is an ISO 12 film right now. It was ok at 25 but I think one extra stop would be better.
Looks good. The blank APX25 still baffles me. Maybe the little silver there was in that emulsion just evaporated over time?
It wasn't 'blank blank' but I could only see very faint images. So almost blank. Which is unusual as usually the slower the film, the longer it lasts. But it seems like it may now be an ISO 1 or 2 film.
The APX 100 looks like it is an ISO 12 film right now. It was ok at 25 but I think one extra stop would be better.
Dec 18, 2023 at 06:22 PM
p.5 #20How long do you think a latent image lasts on undeveloped film?
Desmolicious wrote:
http://live.staticflickr.com/65535/53387633242_9c029fa9e7_b.jpg
If anyone's interested in a 3-hour tour of the Kodak manufacturing process in Rochester, NY, then check out Fred's Thread on How Film Works
It's a long series, but it's very comprehensive. Kodak's main chemist tells just about everything you'd want to know, but stops short of giving away their trade secrets. One of the subjects that he discusses is latent image stability. In a nutshell, it's caused by manufacturers cheaping out on $ilver when they make the film.
http://live.staticflickr.com/65535/53387633242_9c029fa9e7_b.jpg
If anyone's interested in a 3-hour tour of the Kodak manufacturing process in Rochester, NY, then check out Fred's Thread on How Film Works
It's a long series, but it's very comprehensive. Kodak's main chemist tells just about everything you'd want to know, but stops short of giving away their trade secrets. One of the subjects that he discusses is latent image stability. In a nutshell, it's caused by manufacturers cheaping out on $ilver when they make the film.
Dec 19, 2023 at 06:30 PM