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New camera lens, darker pictures are grainy

M

MikeMike

Lifer
when in low room light, the pictures turn out really grainy, this could just be my own fault, or the lens, but the stock 28-50mm rebel lens seems to do fine in the same situation. what could be causing this? the lens itself?

MIKE
 
It's probably a combination of the new lens and what the camera does to compensate. Your new lens doesn't let as much light in as the old one, and the camera turns up the ISO to compensate which causes the grain.
 
Lens doesn't cause graininess except as the stinky one mentioned by having a smaller maximum aperture.

The Sigma 70-300 is one of my favorite zooms ever. On my old Minolta bodies I would get razor sharp action shots (surfing) through that glass. I was very happy with it!
 
i just got my sigma 70-300 for my rebel yesterday for xmas. works fine. what settings are you using? auto / manual? iso's?
 
The camera is either automatically turning up the ISO to compensate for the loss of light (the longer lens is probably letting in less light than your 28-50 (50?) lens, or your pictures are coming out underexposed and your printing lab is compensating. Either way, grain goes up. Make sure you have enough light. A comsumer 70-300 rarely has enough light gathering capabilities to shoot inside without really cranking up the ISO.
 
its digital. forgot to mention that part, but yea, it was probably because i was messing with the iso etc. on a manual setting.

MIKE
 
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