07-15-2010, 12:22 AM
[quote name='larsrc' date='14 July 2010 - 01:00 PM' timestamp='1279105202' post='996']
I thought it was impossible to mount APS-C lenses on FF Canons due to lack of mirror clearance?
-Lars
[/quote]
No, it is very well possible, except with the Canon EF-S lenses.
Essentially, all of these third party lenses have to cater for the longest register distance of the mounts for which the manufacturers want to sell their lenses, so even a "digital", APS-C, or whatever the lens is called, even though it caters for APS-C, in EF fitting it will mount without a problem on any Canon, due to Canon having one of the shortest register distances. If the mirror doesn't hit the lens on a Nikon, it certainly won't do so on a Canon.
And this is certainly true for Sigma, Tamron and Tokina. I tested several of these personally <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt=':o' />.
It also means that you can get frame filling images on a FF camera, with such a lens, provided you are either close enough, or with a zoom lens if you zoom in by some, generally a factor of about 1.3 to 1.5, i.e., zoom, e.g., a 10 - 20 mm lens to somewhere between 13 and 15 mm to determine where the point is where the VF is completely filled by the image.
I found, f.e., that the Tokina 10-17 fisheye zoom fills the entire frame on a 5D by approximately 14.8 mm without mechanical vignetting, covering a whopping 183 degrees in AoV. And this without shaving the lens <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />.
It varies a bit from lens to lens, but this is the type of thing you may expect. IQ-wise it probably doesn't even deteriorate that much, except maybe for some extra optical vignetting.
HTH, kind regards, Wim
I thought it was impossible to mount APS-C lenses on FF Canons due to lack of mirror clearance?
-Lars
[/quote]
No, it is very well possible, except with the Canon EF-S lenses.
Essentially, all of these third party lenses have to cater for the longest register distance of the mounts for which the manufacturers want to sell their lenses, so even a "digital", APS-C, or whatever the lens is called, even though it caters for APS-C, in EF fitting it will mount without a problem on any Canon, due to Canon having one of the shortest register distances. If the mirror doesn't hit the lens on a Nikon, it certainly won't do so on a Canon.
And this is certainly true for Sigma, Tamron and Tokina. I tested several of these personally <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt=':o' />.
It also means that you can get frame filling images on a FF camera, with such a lens, provided you are either close enough, or with a zoom lens if you zoom in by some, generally a factor of about 1.3 to 1.5, i.e., zoom, e.g., a 10 - 20 mm lens to somewhere between 13 and 15 mm to determine where the point is where the VF is completely filled by the image.
I found, f.e., that the Tokina 10-17 fisheye zoom fills the entire frame on a 5D by approximately 14.8 mm without mechanical vignetting, covering a whopping 183 degrees in AoV. And this without shaving the lens <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />.It varies a bit from lens to lens, but this is the type of thing you may expect. IQ-wise it probably doesn't even deteriorate that much, except maybe for some extra optical vignetting.
HTH, kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....