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Photography Question 

D W. A
 

Grainy pics when zoom is used


I recently went up in a private plane and I decided to take my equipment up with me. The Problem I had is sometimes when I used my 80-200mm zoom lens (all the way to 200mm) The pics turn out grainy but some don't. But when I used my 50mm all turned out great.

It was a vey sunny day. I used 400 iso,
The camera is an old canon A-1.

What am I doing wrong????


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August 05, 2004

 

Andy
  The grainy ones could be the film is underexposed. At 200mm you need to open up the aperture about 2 stops than at 50mm. Is the A-1 manual or automatic?


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August 05, 2004

 
- Gregory LaGrange

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  sure that it's grain and not fuzziness from using a telephoto through a window


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August 05, 2004

 

D W. A
  The A-1 has manual and auto settings. I was using it on auto at 1/1000 sutter speed. I know its not the window because some of the pics turned out fine.


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August 05, 2004

 
- Gregory LaGrange

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  then you probably zoomed in on some bright areas that fooled the meter, making it under expose for some.
The 50mm didn't have a predominant bright area in view, so you got a more accurate exposure.


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August 05, 2004

 
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