Focal length when using Canon EF-S lenses
Jun 4, 2012 09:03:18 #
nmw1004
Loc: Dresher PA
If I use a canon EF-S 17- 85 mm on a digital rebel body, is it realy 17-85 or do I still have to muliply by 1.6 to get the accual focal length even though this lense cannot be used on a full frame body?
Jun 4, 2012 09:09:38 #
Photog1
Loc: North America
it's an actual 17-85. There is no "magnification" involved. That is an idiotic "internet fact" that refuses to die.
The crop factor 1.6 thing means that WHAT YOU SEE, when you look through the viewfinder of your CROP camera with a 17-85mm lens, is the same FIELD OF VIEW that a person with a FULL FRAME camera would see with a 28-135mm lens (more or less.. 27.2 x 136, but who's counting...)
The crop factor 1.6 thing means that WHAT YOU SEE, when you look through the viewfinder of your CROP camera with a 17-85mm lens, is the same FIELD OF VIEW that a person with a FULL FRAME camera would see with a 28-135mm lens (more or less.. 27.2 x 136, but who's counting...)
Jun 4, 2012 14:12:53 #
Jun 5, 2012 08:49:42 #
Canon EF-S lenses don't require the 1.6 X factor as they are designed for the cropped sensor cameras. They have a different lens mount that protrudes into the camera body and for that reason they can't be used on "full-frame" camera bodies. If you use an EF lens you'll need to use the 1.6 X factor as these lenses are designed for "full-frame" camera models. The EF lenses can be used on either type camera body. Hope this helps.
Jun 5, 2012 09:44:41 #
waterfixer424 wrote:
If you use an EF lens you'll need to use the 1.6 X factor as these lenses are designed for "full-frame" camera models. Hope this helps.
Uhhhh,... not correct.
A 50mm EFs lens and a 50mm EF lens give you the same angle of view on a crop sensor camera.
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