I have a durst m301 and I noticed I can focus sharply with the red filter in place and it'll be tack sharp under the grain focuser... But when I move the red filter away I'll have to refocus to get it sharp on the paper...
Has anybody ran into this problem as well??? I think I'll just focus without a red filter on a piece of paper that will be the "sacrificial lamb" then turn off the lamp and switching out the paper then expose it... Any other suggestions??
Yes. Don't bother with the sacrificial paper... unless you have a dark easel base...
I always focus with a scrap piece of paper under the grain focuser. Why bother with something that has the precision of a grain focuser and not compensate for the thickness of the paper? The focus sheet is reusable. It's not as if it costs money to do it properly.
David,
It doesn't cost money but it isn't necessary. I did some experiment a while back. I focused sharply using grain focuser onto a white sheet of paper in easel. Then, I raised my easel by 5mm. Then rechecked focus. It was STILL in focus. This is with 50mm EL-Nikkor 2.8 at wide open.
Then you might as well toss the grain focuser and eyeball it.
David,
It doesn't cost money but it isn't necessary. I did some experiment a while back. I focused sharply using grain focuser onto a white sheet of paper in easel. Then, I raised my easel by 5mm. Then rechecked focus. It was STILL in focus. This is with 50mm EL-Nikkor 2.8 at wide open.
Then you might as well toss the grain focuser and eyeball it.
Why bother to align the enlarger? Why bother to use a glass negative carrier? Why worry about what kind of lens to use?
I have a durst m301 and I noticed I can focus sharply with the red filter in place and it'll be tack sharp under the grain focuser... But when I move the red filter away I'll have to refocus to get it sharp on the paper...
I'm not surprised, looking at the attached depth of field table. Placing a piece of paper under the grain focuser to compensate for the missing paper thickness is theoretically correct but practically pointless. Placing it on a dark easel as a focusing aid is valuable.
I... the possibility (suggested by Ctein in Post-Exposure if I remember correctly) that multigrade paper tends to be slightly less sharp than graded paper perhaps due to the difference in the spectral sensitivity of the paper depending on the contrast grade ...
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