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FORUMS Canon Cameras, Lenses & Accessories Canon G-series Digital Cameras
Thread started 14 Sep 2003 (Sunday) 00:30
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TC-DC52 light loss?

 
dkwelk
Hatchling
2 posts
Joined Sep 2003
Sep 14, 2003 00:30 |  #1

Hi:
'Was curious if anyone with a TC-DC52 or other PowerShot A-series teleconverter has noticed light loss. A 2.4X teleconverter on a standard SLR reduces aperture by an f-stop or more. You can't really afford that when the f-equivalent on the A70 at max focal length is already a sluggish f4.8

Thanks




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bfaust
Member
132 posts
Joined May 2002
Sep 14, 2003 21:42 |  #2

I don't think the G2 teleconveeter loses light because it is being added in front of the lens. The SLR teleconverter loses light because it is behind the lens. Some smart guy can give us the physics behind all that.




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dkwelk
THREAD ­ STARTER
Hatchling
2 posts
Joined Sep 2003
Sep 17, 2003 21:32 |  #3

Hi:
I did a bit of research since this posting and came upon this explanation for light loss when using a teleconverter with a standard SLR: the loss results from the converter extending the aperture further away from the film plane (so it's smaller in relation to it). That wouldn't happen with a front mounted converter like the TC-DC52. I'm going shopping.




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TC-DC52 light loss?
FORUMS Canon Cameras, Lenses & Accessories Canon G-series Digital Cameras


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