Jessestr
Allowing Ads
- Joined
- Mar 31, 2014
- Messages
- 399
- Format
- 35mm
Hi all
Not so long ago I posted a topic about exposure times etc... everything got pretty much cleared out. But today.. things got strange again.
Let's separate this in few items. To be sure, every print is made on the same paper, nothing else but times changed and paper is processed by a machine so no incorrect developing times.
First item - Solved (user error)
I did a teststrip at F8 - 8 seconds and F16 - 32 seconds... both teststrips were different in exposure. Didn't change distance to paper, didn't change paper type or anything else. This should be the same right? What could cause this difference?
Second item - Solved
Yesterday I developed a bunch of 120 negs on 8x10" paper with the same enlarger as today. Head was half way down and most exposures could be done at f11 and 8 to 16 seconds.
Today I developed 35mm negs in the same enlarger (Durst M605) switched the condenser to 35mm and put the right masks in. Had to put the head up to almost max to get the same size of paper as yesterday (8x10")
Here's the strange part: You have to increase the time because the enlarger head is further away from the paper, thus less light is shining on your paper (gets lighter if you dont extend time) Right? However this was not the case. My print was too dark. Even with the enlarger head twice as high as the other prints.
What could be the reason of that? I know that the print was overexposed/slightly overdeveloped so in scan I had to correct it - 0.70 exposure. But that only makes it more strange because less light + overexposed neg will surely turn out too light... but it turned out darker and I had to print almost almost a stop lighter then the other prints... How could this be?
I'm pretty sure I'm missing something theoretically so please enlighten me.
The reason I want to know this is because I really want to guess an average exposure to start my test strip from and it doesn't seem to work out well because this are just... doing strange
Not so long ago I posted a topic about exposure times etc... everything got pretty much cleared out. But today.. things got strange again.
Let's separate this in few items. To be sure, every print is made on the same paper, nothing else but times changed and paper is processed by a machine so no incorrect developing times.
First item - Solved (user error)
I did a teststrip at F8 - 8 seconds and F16 - 32 seconds... both teststrips were different in exposure. Didn't change distance to paper, didn't change paper type or anything else. This should be the same right? What could cause this difference?
Second item - Solved
Yesterday I developed a bunch of 120 negs on 8x10" paper with the same enlarger as today. Head was half way down and most exposures could be done at f11 and 8 to 16 seconds.
Today I developed 35mm negs in the same enlarger (Durst M605) switched the condenser to 35mm and put the right masks in. Had to put the head up to almost max to get the same size of paper as yesterday (8x10")
Here's the strange part: You have to increase the time because the enlarger head is further away from the paper, thus less light is shining on your paper (gets lighter if you dont extend time) Right? However this was not the case. My print was too dark. Even with the enlarger head twice as high as the other prints.
What could be the reason of that? I know that the print was overexposed/slightly overdeveloped so in scan I had to correct it - 0.70 exposure. But that only makes it more strange because less light + overexposed neg will surely turn out too light... but it turned out darker and I had to print almost almost a stop lighter then the other prints... How could this be?
I'm pretty sure I'm missing something theoretically so please enlighten me.
The reason I want to know this is because I really want to guess an average exposure to start my test strip from and it doesn't seem to work out well because this are just... doing strange
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