"One thing to note, full-frame 35mm lenses will have a crop factor of 1.6 on the 7d."
The REAL thing to note is that ALL lenses will have a crop factor of 1.6, not just "full-frame 35mm lenses" (by which I think you mean EF mount lenses). The crop factor comes from the sensor, so even that EF-S 17-55 f/2.8 has a crop factor of 1.6 on your 7D.
Thats incorrect, if you buy a specific EF-s Lens it will not have a crop factor... a 17-55 ef-s lens is just that a 17mm to 55mm any Full frame lens will have a crop factor on it.
August Young @ Nov 17th 2009 5:39PM said: "Thats incorrect, if you buy a specific EF-s Lens it will not have a crop factor... a 17-55 ef-s lens is just that a 17mm to 55mm any Full frame lens will have a crop factor on it."
Um nooo. "17m-55mm" is a measure of focal length in the lens. The sensor does not change the focal length of the optics. Have a look at this page: http://www.tutorial9.net/photography/crop-factor/ under the title "Lenses designed for Crop Factor cameras" where it says (with reference to these lenses):
"One thing to remember is that the crop factor is still in use even on these cameras and you must multiply the given focal length to get the “correct” focal length."
Oh yes, btw, I AM a photographer. I do know what I'm talking about.
A 16mm lens on a full frame camera will have the same angle of view as (approximately) a 26mm on a crop body. A 16mm EF-S lens will have the same angle of view as a 26mm on a crop body.
The crop factor never disappears - the difference is that the EF-S's image circle is smaller, and *will not* fill the frame on a full-frame camera. The angle of view conversion *must* still be calculated.
Exactly what part of my posts do you think is technically incorrect? Please make a point, or you're just irrelevant and a distraction to the actual conversation.
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"One thing to note, full-frame 35mm lenses will have a crop factor of 1.6 on the 7d."
The REAL thing to note is that ALL lenses will have a crop factor of 1.6, not just "full-frame 35mm lenses" (by which I think you mean EF mount lenses). The crop factor comes from the sensor, so even that EF-S 17-55 f/2.8 has a crop factor of 1.6 on your 7D.
Thats incorrect, if you buy a specific EF-s Lens it will not have a crop factor...
a 17-55 ef-s lens is just that a 17mm to 55mm any Full frame lens will have a crop factor on it.
August Young @ Nov 17th 2009 5:39PM said:
"Thats incorrect, if you buy a specific EF-s Lens it will not have a crop factor... a 17-55 ef-s lens is just that a 17mm to 55mm any Full frame lens will have a crop factor on it."
Um nooo. "17m-55mm" is a measure of focal length in the lens. The sensor does not change the focal length of the optics. Have a look at this page: http://www.tutorial9.net/photography/crop-factor/ under the title "Lenses designed for Crop Factor cameras" where it says (with reference to these lenses):
"One thing to remember is that the crop factor is still in use even on these cameras and you must multiply the given focal length to get the “correct” focal length."
Oh yes, btw, I AM a photographer. I do know what I'm talking about.
August: That's also incorrect.
A 16mm lens on a full frame camera will have the same angle of view as (approximately) a 26mm on a crop body.
A 16mm EF-S lens will have the same angle of view as a 26mm on a crop body.
The crop factor never disappears - the difference is that the EF-S's image circle is smaller, and *will not* fill the frame on a full-frame camera. The angle of view conversion *must* still be calculated.
>> Oh yes, btw, I AM a photographer. I do know what I'm talking about.
You ARE a photographer, and have no freaking clue about the different between EF and EF-S lenses? Get off my lawn.
Let me guess, you are also a mac and iphone user.
@gary:
Exactly what part of my posts do you think is technically incorrect? Please make a point, or you're just irrelevant and a distraction to the actual conversation.