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Crop ratio
Dec 31, 2012 14:46:21 #
Dec 31, 2012 15:04:14 #
For any given lens you fit you have to multiply the focal length by 1.5 so your 70mm-300Mm zoom becomes a 105mm-450mm
That same lens on a full frame body would give the actual 70mm-300mm
That same lens on a full frame body would give the actual 70mm-300mm
Dec 31, 2012 15:04:36 #
It means that your sensor is 2/3rds the size of a full frame/35mm sensor (which is 24x36 mm - the size of a 35mm film frame). Since you are only capturing the middle 2/3rds of a full frame, the effective focal length of your lenses when a photo is printed, appears to be 1.5 times it's nominal focal length. The 1.5 is the 'crop' factor. It would be no different than if you took the center 2/3rds of a photo you shot with a full frame film camera and enlarged it to fill the frame.
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Dec 31, 2012 15:06:24 #
Part of Wikipedia's answer is copied below:
The terms crop factor and focal length multiplier were coined in recent years in an attempt to help 35 mm film format SLR photographers understand how their existing ranges of lenses would perform on newly introduced DSLR cameras which had sensors smaller than the 35 mm film format, but often utilized existing 35 mm film format SLR lens mounts. Using an FLM of 1.5, for example, a photographer might say that a 50 mm lens on his DSLR "acts like" its focal length has been multiplied by 1.5, by which he means that it has the same field of view as a 75 mm lens on the film camera that he is more familiar with. Of course, the actual focal length of a photographic lens is fixed by its optical construction, and does not change with the format of the sensor that is put behind it.
The terms crop factor and focal length multiplier were coined in recent years in an attempt to help 35 mm film format SLR photographers understand how their existing ranges of lenses would perform on newly introduced DSLR cameras which had sensors smaller than the 35 mm film format, but often utilized existing 35 mm film format SLR lens mounts. Using an FLM of 1.5, for example, a photographer might say that a 50 mm lens on his DSLR "acts like" its focal length has been multiplied by 1.5, by which he means that it has the same field of view as a 75 mm lens on the film camera that he is more familiar with. Of course, the actual focal length of a photographic lens is fixed by its optical construction, and does not change with the format of the sensor that is put behind it.
Dec 31, 2012 16:44:57 #
Thanks guys. I'm an old 35mm guy and wasn't familiar with the terminology. I wasn't sure that I had 2/3-full frame camera but that let's me know for sure
Dec 31, 2012 18:53:58 #
Dec 31, 2012 19:01:55 #
unclebe1 wrote:
It means that your sensor is 2/3rds the size of a full frame/35mm sensor (which is 24x36 mm - the size of a 35mm film frame). Since you are only capturing the middle 2/3rds of a full frame, the effective focal length of your lenses when a photo is printed, appears to be 1.5 times it's nominal focal length. The 1.5 is the 'crop' factor. It would be no different than if you took the center 2/3rds of a photo you shot with a full frame film camera and enlarged it to fill the frame.
Actually the crop sensor (approx. 16mm x 24mm) is almost exactly HALF the size of the full frame sensor (Approx. 24mm x 36mm). Canons crop sensor is smaller than Nikons and that is why the Canon requires a 1.6X crop factor to compute equivalent lens focal lengths on those APS-C bodies.
The wide side of the DX sensor is 24mm while the wide side of the FX sensor is 36mm, hence the 1.5X factor.
Jan 1, 2013 08:30:05 #
ole sarg
Loc: south florida
It seems to me that regardless of crop factor what you see through the view finder is what you get.
Jan 1, 2013 10:49:52 #
ole sarg wrote:
It seems to me that regardless of crop factor what you see through the view finder is what you get.
You hit it sarg. I went from 4X5 to 2 1/4 to 35 mm to crop. I would go nuts tring to convert the each size lens to the image on the 35mm sensor. - Dave
Jan 1, 2013 11:36:44 #
MT Shooter wrote:
quote=unclebe1 It means that your sensor is 2/3rd... (show quote)
OKAY...let me be as accurate and precise (two different concepts) as possible. Each side of the sensor is 2/3rds the size of a full frame sensor. Therefore the area of the sensor is 4/9ths (44.4%) the size of a full frame sensor.
:lol: :roll: Are we all on the same page now??? :-D
HAPPY NEW YEAR TO ALL MY UHH COMPADRES!!!!
Jan 1, 2013 13:43:39 #
unclebe1 wrote:
quote=MT Shooter quote=unclebe1 It means that yo... (show quote)
Uncle, I'll drink to that, I guess. Hey, who took my glass?
And a beautiful new year it's turning out to be!
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