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 Post subject: Lens Crop Question
PostPosted: Sat Dec 15, 2007 12:32 pm 
I've read that the sensors for most non full frame cameras have a 1.6 crop. Does this apply to both efs and ef lenses? We've got an old EOS 650 and it comes with a 50mm lens with a max aperture of 1.8 and was wondering if I attach it to something like a 40d (I'm planning to get one this January) that it will end up becoming an 80mm equivalent lens.


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PostPosted: Sat Dec 15, 2007 1:27 pm 
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Crop factor only depends on the body/sensor-size you have and is identical to all the lenses you can attach to this body. So a 50mm on a canon 1.6 crop body (like the 40D) will end up behaving like a 80mm on a FF-body.

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 Post subject:
PostPosted: Sat Dec 15, 2007 5:10 pm 
Firstly make sure that your old 50mm lens is an EF lens otherwise it will not work on any current EOS Camera, on any model with a cropped sensor you will have to times the focal length of any lens by 1.6, that applies to EF and EF-S lenses the only Canon Cameras that you will not have to multiply with are the 5D and the 1D models as these are Full Frame models where the sensor is more or less the same size as 35mm film.


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 Post subject: Re: Lens Crop Question
PostPosted: Sat Dec 15, 2007 9:55 pm 
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Hi kamui18,

A warm welcome to the CameraLabs forums.

Good advice above. Additionally, please do not be tempted to try any EF-S lens on your old EOS 650. If you do somehow manage to attach it there is a significant chance that you will damage the camera's mirror assembly when you click the shutter button. :evil:

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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 Post subject:
PostPosted: Sat Dec 15, 2007 11:14 pm 
Thanks for the replies. I was thinking about what kind of lenses will be getting in the future. I'll be sticking with the EF series despite the crop so that I can use them both with whatever DSLR I'll be getting and our older 650.

This actually leads me to another question, from what I understand, the EOS 650 is the first EOS camera that Canon manufactured. Does it have any compatibility issues with the newer EF lenses or are they supposed to work with it without any hitches? We also have a Speedlite 300EZ that my dad purchased years ago with the camera, would it aslo work with a 40D?


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 Post subject:
PostPosted: Sun Dec 16, 2007 12:36 am 
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My understanding is that any EF lens will work with any EOS camera. If you have a particular concern you could always contact Canon's technical support.

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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