When is 50mm *not* 50mm?
Jan 18, 2014 14:05:51 #
Dave,
Just a caution, never, never mount a EFS lenses on a Canon Full Frame camera.... it can be a very costly mistake... they are not compatible..
Just a caution, never, never mount a EFS lenses on a Canon Full Frame camera.... it can be a very costly mistake... they are not compatible..
Jan 18, 2014 14:06:07 #
Kingmapix wrote:
Every lens you buy has on it a focal length number. This number ( 50mm, 35mm, 200mm) refers to its size while mounted on a full frame body. If you have a C-sized body, you multiply that number by 1.5 (for Nikon body) or 1.6 (for Canon body) to arrive at its actual magnification for C-sized bodies. In other words, a 50mm lens on a C-sized body acts like a 75 - 80mm lens on a Full Frame body.
It doesn't matter what body the lens is mounted on.
The focal length remains the same.
Jan 18, 2014 14:35:34 #
Kingmapix wrote:
Every lens you buy has on it a focal length number. This number ( 50mm, 35mm, 200mm) refers to its size while mounted on a full frame body. If you have a C-sized body, you multiply that number by 1.5 (for Nikon body) or 1.6 (for Canon body) to arrive at its actual magnification for C-sized bodies. In other words, a 50mm lens on a C-sized body acts like a 75 - 80mm lens on a Full Frame body.
So, the listed focal length *is* always for a 35mm equivalent, then? That was the gist of my original question... Thanks.
Jan 18, 2014 14:36:40 #
mckraft wrote:
Dave,
Just a caution, never, never mount a EFS lenses on a Canon Full Frame camera.... it can be a very costly mistake... they are not compatible..
Just a caution, never, never mount a EFS lenses on a Canon Full Frame camera.... it can be a very costly mistake... they are not compatible..
I thought it was the other way around, that full frame lenses could damage the mirror on a crop camera...
Jan 18, 2014 16:53:47 #
Straightshooter
Loc: Edmonton AB
Bloke wrote:
I thought it was the other way around, that full frame lenses could damage the mirror on a crop camera...
Wrong,, mckraft is right
Jan 18, 2014 18:54:49 #
[quote=Bloke]I have a question about focal lengths and crop factors.
I guess what I am asking is, can I assume that *any* lens which fits the crop camera would have the 1.5x 'conversion factor'?
Yes, any lens for your T4i will have 1.6x conversion factor.
I guess what I am asking is, can I assume that *any* lens which fits the crop camera would have the 1.5x 'conversion factor'?
Yes, any lens for your T4i will have 1.6x conversion factor.
Jan 20, 2014 08:52:09 #
Bloke wrote:
I have a question about focal lengths and crop fac... (show quote)
Hi Bloke, All it is saying that with a FF camera no matter what lens you use the focal length will be that FL.
With a crop sensor camera the lens on a Canon will be 1.5x converted so ....... for a 70-300mm a lens would actually be 105-450mm. That goes for any lens with the crop factor of 1.5x, no matter what you are shooting.
Jan 20, 2014 09:34:54 #
sportyman140 wrote:
With a crop sensor camera the lens on a Canon will be 1.5x converted so ....... for a 70-300mm a lens would actually be 105-450.
With a crop sensor camera the lens on a Canon will be 1.5x converted so ....... for a 70-300mm a lens would actually be 105-450.
The focal length does NOT change!!!! It is still a 70-300. The angle of view changes but not the focal length. Please use the words: "full-frame equivalent" or "eq" when you make the comparison.
Jan 20, 2014 15:33:14 #
Even though the EF-S lenses won't fit on a full-frame body, they STILL advertise the focal length as if it WERE on a full-frame. This is bc of the whole angle of view/lens distortion issues already discussed.
Jan 20, 2014 15:56:49 #
mickley
Loc: Schenectady NY
Bloke wrote:
I have a question about focal lengths and crop fac... (show quote)
Bloke, if it's a 50mm lens, its 50mm. When you put in on a camera, that's when things get "interesting". Assuming that the lens in question is a full framer (EF series), with the smaller Canon APS sensor, you would be looking at the smaller/central part of the image (as opposed to seeing all of it with a full frame sensor). So, in effect, you have cropped the original view. I'm sure there are others that will have comments about that "cropped" view, but they can't change what the lens manufacturer built.
Jan 20, 2014 16:28:36 #
dali_lama_2k wrote:
Even though the EF-S lenses won't fit on a full-frame body, they STILL advertise the focal length as if it WERE on a full-frame.
They advertise the focal length as it is actually measured, regardless of what camera format is used.
Jan 20, 2014 19:20:48 #
GoofyNewfie wrote:
They advertise the focal length as it is actually measured, regardless of what camera format is used.
Yup! And some lenses designed for crop factor sensors will fit on "full frame" bodies (my tamron 10-24, fur example), the image circle will not fill the frame, having a vignetting effect.
Jan 21, 2014 22:31:01 #
Bloke wrote:
I have a question about focal lengths and crop fac... (show quote)
On my Olympus PEN ePL5 the kit lens is 14-42mm focal length in reality but it is equivalent to a 28-84mm (2X) in the 35mm film full-frame world.
So my lens is labeled as to what its focal length really is measurable as being but if I want to compare the view through it to the full-frame world, I would set my zoom at 25mm according to the markings on the lens to equal the view through a 50mm on a full-frame digital or 35mm film camera (2X is different than other cameras because I have a 4/3 sensor).
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