03-06-2012, 12:06 PM
[quote name='Walid' timestamp='1331034620' post='16439']
I have been told that Nikon 300mm f4 on FF camera will not be 300mm it will be less, is this correct?
[/quote]
No, that is not correct. The FL (Focal Length) will always stay the same, regardless of the camera a lens is mounted on.
And AFAIK, the Nikkor 300 F/4 is an FX lens, so will work both on APS-C and FF.
The difference or confusion if you like, comes in from that fact that a smaller sensor based camera only sees part of the image a FF sensor sees, a crop of the full image circle, hence the alternative name of cropcameras and of the term crop factor. This crop factor is the measure by which a FL needs to be multiplied with in order to get a FF equivalent FL. IOW, a 300 mm on a Nikon APS-C body, which has a crop factor of 1.5, provides the same angle of view, due to the camera sensor only seeing part of the FF image, of a 1.5 X 300 mm = 450 mm lens. And when mounted on a FF camera, you will get the view it would normally have. The latter people sometimes also refer to as a crop factor of 1 <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />.
As BC notes higher up, a lens specifically designed for a "crop camera" will have a smaller image circle, tailored to the APS-C sensor format, and therefore when used with a FF sensor camera, the image will vignette heavily.
HTH, kind regards, Wim
I have been told that Nikon 300mm f4 on FF camera will not be 300mm it will be less, is this correct?
[/quote]
No, that is not correct. The FL (Focal Length) will always stay the same, regardless of the camera a lens is mounted on.
And AFAIK, the Nikkor 300 F/4 is an FX lens, so will work both on APS-C and FF.
The difference or confusion if you like, comes in from that fact that a smaller sensor based camera only sees part of the image a FF sensor sees, a crop of the full image circle, hence the alternative name of cropcameras and of the term crop factor. This crop factor is the measure by which a FL needs to be multiplied with in order to get a FF equivalent FL. IOW, a 300 mm on a Nikon APS-C body, which has a crop factor of 1.5, provides the same angle of view, due to the camera sensor only seeing part of the FF image, of a 1.5 X 300 mm = 450 mm lens. And when mounted on a FF camera, you will get the view it would normally have. The latter people sometimes also refer to as a crop factor of 1 <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />.As BC notes higher up, a lens specifically designed for a "crop camera" will have a smaller image circle, tailored to the APS-C sensor format, and therefore when used with a FF sensor camera, the image will vignette heavily.
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 ....