1.6 Crop Factor
Jan 2, 2020 06:51:01 #
MT Shooter wrote:
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.
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 2, 2020 06:51:45 #
billnikon
Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont
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?
Your crop factor of 1.6 would result in an angel of view of 960 mm.
Jan 2, 2020 07:46:11 #
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?
Be sure to use the word "equivalent" when discussing crop factors. You get the 960 effect with a 600mm focal length.
Jan 2, 2020 07:58:23 #
jerryc41 wrote:
Be sure to use the word "equivalent" when discussing crop factors. You get the 960 effect with a 600mm focal length.
Jan 2, 2020 09:16:12 #
The crop factor of apsC, is the best sale pitch ever defined, whoever’s cam out with it deserves an Kudo for imagination, it’s such well conceived that so many photographer swear on their mothers grave that it is thrue
Jan 2, 2020 09:32:14 #
billnikon
Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont
jerryc41 wrote:
Be sure to use the word "equivalent" when discussing crop factors. You get the 960 effect with a 600mm focal length.
Angle of view is also used to describe the effect.
Jan 2, 2020 09:33:50 #
Retina
Loc: Near Charleston,SC
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.
Before the price of larger sensors came down and interchangable lens digital cameras were new and expensive, 35mm film cameras were still common household items. Equivalent focal length was very useful since most SLR owners were introduced to digital photography (though some will not admit it) using small sensor cameras with non-detachable lenses. We were already familiar with various common focal lengths and their respective Fields of View from the film days. When film is really ancient history, some will ask "Equivalent to what?" and "Why do they call it full frame when medium format is larger?"
Jan 2, 2020 09:52:54 #
ggab
Loc: ?
Longshadow wrote:
I believe most of us were taking the camera as a 1... (show quote)
Begging to disagree.
Some assumptions:
1-Crop sensor camera is 20mpx "1.6 crop factor compared to 35mm sensor" sensor
2-FF sensor is 20mpx
3-Shooting the same image with the same lens, all other factors such as exposure, f/stop etc. are the same.
The .625 crop image from the full frame camera will only contain 12.5mpx. The image from the crop sensor camera will contain 20mpx. The greater resolution will provide greater detail from the crop sensor camera and therefore what is seen.
Final assumption, my math is correct.
Jan 2, 2020 10:19:30 #
ggab wrote:
Begging to disagree. br Some assumptions: br 1-Cro... (show quote)
You need to recheck your math. A 20MP FF camera (Canon) shot at APS-C crop mode yields approx 42% of the FF image, or 8.2MP image size.
Jan 2, 2020 10:21:52 #
ggab wrote:
Begging to disagree. br Some assumptions: br 1-Cro... (show quote)
There are complications and considerations, pros and cons, when one chooses to go down the rabbit hole. The first article I linked earlier lays them out pretty clear. For example in your example the photosites on the crop sensor camera must be smaller, raising diffraction issues. Plus full frame users can get narrower depth of field if desired, plus less noise and greater dynamic range in lower light, and other factors.
Jan 2, 2020 10:24:33 #
ggab wrote:
Begging to disagree. br Some assumptions: br 1-Cro... (show quote)
The difference in lenses used on the two types of cameras is field of view, what the image will look like.
Yes, the pixel count is different between the cameras, but it doesn't alter the field of view, only the resolution of the image.
The difference is field of view. The pixel difference yields a resolution difference between the two cameras,
two different animals.
Jan 2, 2020 10:32:01 #
jerryc41 wrote:
Be sure to use the word "equivalent" when discussing crop factors. You get the 960 effect with a 600mm focal length.
“Full-Frame equivalent”?
Jan 2, 2020 10:33:27 #
ggab
Loc: ?
Longshadow wrote:
The difference in lenses used on the two types of cameras is field of view, what the image will look like.
Yes, the pixel count is different between the cameras, but it doesn't alter the field of view, only the resolution of the image.
The difference is field of view. The pixel difference is resolution difference between the two cameras,
two different animals.
Yes, the pixel count is different between the cameras, but it doesn't alter the field of view, only the resolution of the image.
The difference is field of view. The pixel difference is resolution difference between the two cameras,
two different animals.
At no time did I reference "Field of View".
I was just nit picking.
My post related directly and entirely to the resolution of the image using both full frame and crop sensor, as it related to the image created by the crop sensor camera. I point out that the image from the full frame camera, cropped to meet the image from the crop sensor camera is almost half the resolution.
None of us, in today's world, would choose a 12mpx full frame camera to shoot with yet that is what you get when comparing the resolution of an image from a crop sensor camera vs the equivalent image from full frame camera, with the assumptions I used.
What this has to do with the price of rice in China? No idea.....
Jan 2, 2020 10:40:30 #
ggab wrote:
At no time did I reference "Field of View&quo... (show quote)
Image resolution is a separate subject. Crop any image from any camera and you change the resolution.
The crop factor is the affect on the field of view, what is seen (captured) by the camera. Any resolution difference is a function of the pixel density differences between the two sensors.
Jan 2, 2020 10:43:37 #
ggab
Loc: ?
Longshadow wrote:
Image resolution is a separate subject. Crop any image from any camera and you change the resolution.
The crop factor is the affect on the field of view, what is seen (captured) by the camera. Any resolution difference is a function of the pixel density differences between the two sensors.
The crop factor is the affect on the field of view, what is seen (captured) by the camera. Any resolution difference is a function of the pixel density differences between the two sensors.
So you agree, sensor differences matter?
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