1.6 Crop Factor
Jan 1, 2020 19:04:53 #
If I am using a 150-600mm lens, and shooting at 600mm does this mean I am shooting at an actual focal length of 960mm?
Jan 1, 2020 19:06:58 #
will47 wrote:
If I am using a 150-600mm lens, and shooting at 600mm does this mean I am shooting at an actual focal length of 960mm?
Absolutely not.
A lens never changes. The only thing that "crop factor" tells you is what lens would need to be used on a full frame camera to get the exact same image as you get with your crop sensor camera at any specific focal length setting.
Your camera adds no increase in lens magnification, it only captures a portion of the circular image projected by that lens. This makes the lens "appear" to have more magnification, but in reality it does not.
Jan 1, 2020 19:19:37 #
will47 wrote:
If I am using a 150-600mm lens, and shooting at 600mm does this mean I am shooting at an actual focal length of 960mm?
No it is still 150-600, same as cropping a full frame camera in post, the equivalent field of view is what you get. It gets complicated, especially when they cram the pixels closer together to get the same number in. Detailed info:
https://www.cambridgeincolour.com/tutorials/digital-camera-sensor-size.htm
https://photographylife.com/what-is-crop-factor
Jan 1, 2020 19:43:41 #
The lens still is and acts like and is a 150-600. The camera is only taking .625 the field of view of the lens, which make the image appear to have been taken with a 240-960.
Jan 1, 2020 19:44:30 #
mas24
Loc: Southern CA
As stated by MT Shooter, the lens never changes. A 600mm lens is a 600mm, regardless, if it is, on a full frame or crop sensor. camera. You will get a Field of View (FOV) of 900mm on a 1.5X factor on a Nikon crop sensor. And a 1.6X factor on a Canon crop sensor. Some photographers call FOV, the Angle of View. Take your choice.
Jan 1, 2020 20:25:30 #
Hamltnblue
Loc: Springfield PA
will47 wrote:
If I am using a 150-600mm lens, and shooting at 600mm does this mean I am shooting at an actual focal length of 960mm?
What camera are you using?
Jan 1, 2020 20:33:57 #
You will get the FOV (AOV) whatever that is the same as a 960mm on a FF camera. Unless you know what the FOV of a 960mm on the FF camera this corp factor information is useless to you. If you already have the lens just look thru the viewfinder to see what you get. If you don't have the lens and consider buying it then look thru the viewfinder with a lens you already have then you can figure out how such a lens would look like.
For example you have the 18-55mm lens. Put that lens on and zoom to 55mm. Now if you have the 600mm lens on you see only the center of that view with the height and width that is of 55/600. The image you will capture will be only 1/11 of what you see with the 55mm lens.
For example you have the 18-55mm lens. Put that lens on and zoom to 55mm. Now if you have the 600mm lens on you see only the center of that view with the height and width that is of 55/600. The image you will capture will be only 1/11 of what you see with the 55mm lens.
Jan 1, 2020 20:38:36 #
These discussions are always entertaining. There is the math and technology. Then there is what you see in the viewfinder, screen and print. Until the photo world uses the angular field of view instead of "full frame equivalent" we will never stop having this topic.
Jan 1, 2020 20:41:08 #
bsprague wrote:
These discussions are always entertaining. There is the math and technology. Then there is what you see in the viewfinder, screen and print. Until the photo world uses the angular field of view instead of "full frame equivalent" we will never stop having this topic.
Yes! If one uses both crop and FF one would know the effect of focal length on each format. If one only uses one format why would one care about the equivalent FOV on other formats.
Jan 1, 2020 20:48:53 #
"If one only uses one format why would one care...."
This is "art". Just look through the viewfinder. The "mms" and "crop factor" don't really count.
This is "art". Just look through the viewfinder. The "mms" and "crop factor" don't really count.
Jan 1, 2020 20:49:00 #
Hamltnblue wrote:
What camera are you using?
Title states 1.6 crop factor, does it matter what camera?
Jan 1, 2020 20:53:43 #
bsprague wrote:
"If one only uses one format why would one care...."
This is "art". Just look through the viewfinder. The "mms" and "crop factor" don't really count.
This is "art". Just look through the viewfinder. The "mms" and "crop factor" don't really count.
I do realize that sometimes you can't simply look thru the viewfinder. As I posted above sometimes one consider buying a lens and wonder how it would look thru the viewfinder. Also as I have said one doesn't need to know the crop factor, simply compare the focal length of the lens that you have and the one that you consider.
Jan 1, 2020 20:53:53 #
bsprague wrote:
"If one only uses one format why would one care...."
This is "art". Just look through the viewfinder. The "mms" and "crop factor" don't really count.
This is "art". Just look through the viewfinder. The "mms" and "crop factor" don't really count.
"What you see is what you get.".
(Thanks Flip!)
Jan 1, 2020 21:29:31 #
Hamltnblue
Loc: Springfield PA
Longshadow wrote:
Title states 1.6 crop factor, does it matter what camera?
It matters a lot. If it's crop mode on a full frame the result is a 600 cm camera with pixel reduction.
If it's a canon crop sensor camera the result is a 900mm pic at the cameras rated pixels.
Jan 1, 2020 22:03:32 #
Hamltnblue wrote:
It matters a lot. If it's crop mode on a full frame the result is a 600 cm camera with pixel reduction.
If it's a canon crop sensor camera the result is a 900mm pic at the cameras rated pixels.
If it's a canon crop sensor camera the result is a 900mm pic at the cameras rated pixels.
I believe most of us were taking the camera as a 1.6 crop sensor camera.
Maybe a correct inference, maybe not.
That's the problem with titles that are not concise, explicit, or definitive.
Why worry about pixel count when the crop sensor uses .625 of what a a full frame would SEE - field of view. Comparing pixels used in a crop vs. pixels used in a full frame is erroneous. The field of view area is what changes with a crop sensor, what portion of the full frame image is presented to the crop sensor. There is an inherent difference in the number of pixels in between full and crop sensors, but it's the field of view that is different.
Worrying about the pixel count between cameras would be as bad as worrying about exposure differences between cameras because of the sensor size difference (different field of view).
The difference is the image area capture between cameras because of the sensor size difference.
Adding pixels, exposure, etc is just complicating things more.
The pixel count differences between sensors only affects the resolution of what is seen, not what is seen.
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