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Photo Forum / Film Photography / Darkroom / May 2004Grain like golf balls
I just had a roll of ISO400 print film processed at a minilab. The usual lousy prints, but I notice that some shots I took inside under tungsten lighting, wide open (f1.4 or f2)at about 1/60th are really grainy in comparison to outdoor shots from the same roll. This also happens when your flash doesn't have quite the guts to light your scene properly. What is going on here? Why the big grain? Thanks Stu My guess is that it isn't grainer, just more noticeable. Often the case when you try to make a decent print from an underexposed neg. -Lew > I just had a roll of ISO400 print film processed at a minilab. The > usual lousy prints, but I notice that some shots I took inside under [quoted text clipped - 6 lines] > > Stu Post a sample > I just had a roll of ISO400 print film processed at a minilab. The > usual lousy prints, but I notice that some shots I took inside under [quoted text clipped - 6 lines] > > Stu > I just had a roll of ISO400 print film processed at a minilab. The > usual lousy prints, but I notice that some shots I took inside under > tungsten lighting, wide open (f1.4 or f2)at about 1/60th are really > grainy in comparison to outdoor shots from the same roll. This also > happens when your flash doesn't have quite the guts to light your > scene properly. What is going on here? Why the big grain? the lab tries to compesate exposure errors when printing on paper. however, all film are significantly grainier when underexposed (one or two EV missing is quite enough). therefore if you have an underexposed frame on the film, the lab tries to make a more-or-less well-exposed print, but the grain is - obviously - high -- deejay > > I just had a roll of ISO400 print film processed at a minilab. The > > usual lousy prints, but I notice that some shots I took inside under > > tungsten lighting, wide open (f1.4 or f2)at about 1/60th are really > > grainy in comparison to outdoor shots from the same roll. This also > > happens when your flash doesn't have quite the guts to light your > > scene properly. What is going on here? Why the big grain? I have a feeling you are talking about either color negative film or one of the C-41 BW films. It is a characteristic of these films to show more grain with underexposure. As to your question, it is in two parts. The first question "Why?" is age old, has been studied by philosophers through those ages, and has not been answered. Is the grain big? Yes. Sorry. Couldn't resist. > the lab tries to compesate exposure errors when printing on paper. however, > all film are significantly grainier when underexposed (one or two EV missing [quoted text clipped - 11 lines] > Unlimited Download - 19 Seperate Servers - 90,000 groups - Uncensored > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > > > I just had a roll of ISO400 print film processed at a minilab. The > > > usual lousy prints, but I notice that some shots I took inside under [quoted text clipped - 4 lines] > first question "Why?" is age old, has been studied by philosophers > through those ages, and has not been answered. Is the grain big? Yes. isn't he talking about C41 films? i believe there is a *minilab* noticed at the very begining or is it common in UK to have b/w minilabs? *g*  Signaturedeejay > I just had a roll of ISO400 print film processed at a minilab. The > usual lousy prints, but I notice that some shots I took inside under [quoted text clipped - 6 lines] > > Stu Underexposure exposes only the largest, fastest grains. Correct exposure exposes the smaller grains that fill in the image. > > I just had a roll of ISO400 print film processed at a minilab. The > > usual lousy prints, but I notice that some shots I took inside under [quoted text clipped - 9 lines] > Underexposure exposes only the largest, fastest grains. Correct > exposure exposes the smaller grains that fill in the image. Michael and others... Thanks for your answers. OK, so underexposure results in larger grain. Presumably, we are talking about underexposure for the film, not the subject (Sorry if that was completely obvious to everyone else). Would I be right in thinking that the exposure is right down on the toe of the film. This would account for the low contrast too. Is this the same effect as reciprocity failure, ie such a low intensity of light that only the big grains get exposed? At f1.4 at 1/60th, I just haven't crossed the light intensity 'threshold' where the smaller grains get exposed? I guess this is the reson fast film has big grain - it has to, or no image. May be the underexposure is caused by the tungsten light (in case you metered the tungsten light as normal white light). Film doesn?t respond equaly to all wave lengths. > > > I just had a roll of ISO400 print film processed at a minilab. The > > > usual lousy prints, but I notice that some shots I took inside under [quoted text clipped - 25 lines] > I guess this is the reson fast film has big grain - it has to, or no > image. > > > I just had a roll of ISO400 print film processed at a minilab. The > > > usual lousy prints, but I notice that some shots I took inside under [quoted text clipped - 25 lines] > I guess this is the reson fast film has big grain - it has to, or no > image. All films have a variety of grain sizes. The faster the film, the larger the average size. Underexposing affects only the largest, most sensitive grains, so they are the only ones that develop and form the image. It's like making a wall out of large bricks but leaving holes. > All films have a variety of grain sizes. The faster the film, the > larger the average size. Underexposing affects only the largest, most > sensitive grains, so they are the only ones that develop and form the > image. It's like making a wall out of large bricks but leaving holes. excellent explanation!! Thanks! Stefano SignatureNon ? bello cio che ? bello figuriamoci cio che ? brutto! |
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