ewan70
newbie
Reged: 24/04/2008
Posts: 5
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Are there any disadvantages in printing at minimum aperture?
my exposures are a bit too short for dodging/burning and is akward to do so because of it.
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huwevans
Old Hand
Reged: 05/08/2000
Posts: 15120
Loc: Dorset, UK
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Yes - massively so! You'll get horrendous diffraction limiting the resolution of the print. The odd stop or two will probably be okay (especially for smaller enlargements), but going all the way to minimum aperture will be dreadful. Try ND filtration to reduce the effective output of the enlarger if you really need to lengthen exposure times. If you've got a colour head you might be able to achieve what you want by dialing in equal amounts of cyan, yellow, and magenta filters. However if you're printing on multigrade papers either of these methods might result in unintended slight shifts in grade - just have to suck it and see.
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Huw Evans.
  
Edited by huwevans (07/05/2008 15:03)
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Terrywoodenpic
A whiff of silicon...
Reged: 21/01/2006
Posts: 216
Loc: Saddleworth UK
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are you sure you have the right lamp fitted.
The more normal problem is excessively long exposures.
If there is a choice of lamps for your enlarger get the lowest wattage available, this will extend your exposures.
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63 happy photo years from amateur to professional and back to amateur
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