Full Frame in Dx mode
Mar 6, 2018 13:40:16 #
So, on a Nikon D850 with a full frame 70-200 lens, if I put it the camera into Dx mode, do I get the 1.5% crop factor on the lens? So the 70-200 becomes a 105-300?
Mar 6, 2018 13:45:47 #
rgrenaderphoto wrote:
So, on a Nikon D850 with a full frame 70-200 lens, if I put it the camera into Dx mode, do I get the 1.5% crop factor on the lens? So the 70-200 becomes a 105-300?
Yes...
Mar 6, 2018 13:48:19 #
rgrenaderphoto wrote:
I doubt that, since the 70-200 is not a lens made for smaller sized sensor, but a ff lens but I might be wrong, since I don't know how this is implemented on the D850. I thought if you put on an APC lens, the camera does convert automatically, I did not know you could set it that way with a ff lens!So, on a Nikon D850 with a full frame 70-200 lens, if I put it the camera into Dx mode, do I get the 1.5% crop factor on the lens? So the 70-200 becomes a 105-300?
Mar 6, 2018 13:50:28 #
rgrenaderphoto wrote:
So, on a Nikon D850 with a full frame 70-200 lens, if I put it the camera into Dx mode, do I get the 1.5% crop factor on the lens? So the 70-200 becomes a 105-300?
It doesn't 'become' anything new .... but because you're now using just the innermost 2/3rds of the sensor in each dimension, because you crop away 1/3rd of the sensor in each direction, you get the same view you would get with a 105-300mm lens using the entire sensor.
Mar 6, 2018 13:50:31 #
Nope. It's still a 70~200. What changes is the portion of the image circle the DX format will be able to use. This provides an image that appears to have been shot with a longer lens.
--Bob
--Bob
rgrenaderphoto wrote:
So, on a Nikon D850 with a full frame 70-200 lens, if I put it the camera into Dx mode, do I get the 1.5% crop factor on the lens? So the 70-200 becomes a 105-300?
Mar 6, 2018 13:53:57 #
rgrenaderphoto wrote:
So, on a Nikon D850 with a full frame 70-200 lens, if I put it the camera into Dx mode, do I get the 1.5% crop factor on the lens? So the 70-200 becomes a 105-300?
All you have done is "cropped" your image in camera instead of cropping it in post processing software.
Mar 6, 2018 14:00:58 #
rmalarz wrote:
Nope. It's still a 70~200. What changes is the portion of the image circle the DX format will be able to use. This provides an image that appears to have been shot with a longer lens.
--Bob
--Bob
Yes this is true but its really a mute point. Except for the physical characteristics for all practical purposes you have a functional 105-300 lens without spending a dime. Yes there are penalties but mostly introduced in the viewing not the taking end.
Mar 6, 2018 14:16:18 #
bpulv
Loc: Buena Park, CA
rgrenaderphoto wrote:
So, on a Nikon D850 with a full frame 70-200 lens, if I put it the camera into Dx mode, do I get the 1.5% crop factor on the lens? So the 70-200 becomes a 105-300?
No. The 70-200mm lens does not become a 105-300mm lens. It remains the same. The portion of the sensor used is 75% of the full sensor so the angle of view of your image will be an AOV equal to that of a 105-300mm lens. You are only using 75% of the 45.7Mp sensor (34.275Mp). If you shoot with the camera set for an FX lens instead of a DX lens and crop on your computer, you can get exactly the same results with the advantage of having space around the image to work with if you later you decide you want to crop your image differently from what you saw when you took it.
Mar 6, 2018 14:24:49 #
bpulv wrote:
No. The 70-200mm lens does not become a 105-300mm ... (show quote)
You need to re-check your math. The DX sensor size is 42.45% the size of the FX sensor and that results in a 19.4MP DX sized image. (5408 x 3600 pixels)
Mar 6, 2018 14:31:26 #
The simple answer to your question is yes. You effectively convert your camera to a DX crop sensor camera. But I believe your pixel density remains the same so if your FF sensor has 45.7 mp over a 24x36mm sensor, in DX mode you now have 56% fewer pixels (56% smaller sensor area) so only 20.3 mp. As was noted, it’s like cropping your photo, only in-camera and not post.
Mar 6, 2018 14:42:45 #
rgrenaderphoto wrote:
So, on a Nikon D850 with a full frame 70-200 lens, if I put it the camera into Dx mode, do I get the 1.5% crop factor on the lens? So the 70-200 becomes a 105-300?
Yes, you get the 1.5 crop factor. No, your 70-200mm lens remains a 70-200mm lens. What happens is you get the angle of view equivalent to a 105-300mm lens. You also lose the use of the pixels outside the DX crop.
Mar 6, 2018 15:00:05 #
riceman wrote:
The simple answer to your question is yes. You effectively convert your camera to a DX crop sensor camera. But I believe your pixel density remains the same so if your FF sensor has 45.7 mp over a 24x36mm sensor, in DX mode you now have 56% fewer pixels (56% smaller sensor area) so only 20.3 mp. As was noted, it’s like cropping your photo, only in-camera and not post.
Again, re-check your math! Throwing around false information does absolutely nobody any favors. See my post above for the EXACT specs!
Mar 6, 2018 15:00:37 #
bpulv
Loc: Buena Park, CA
MT Shooter wrote:
You need to re-check your math. The DX sensor size is 42.45% the size of the FX sensor and that results in a 19.4MP DX sized image. (5408 x 3600 pixels)
I stand corrected. I never claimed to be a math genius.
Mar 6, 2018 15:30:42 #
bpulv
Loc: Buena Park, CA
bpulv wrote:
I stand corrected. I never claimed to be a math genius.
P.S.: Regardless of the math, the fact remains that a DX frame area on a FX sensor produces the same image in the DX area that it does in that area with an FX frame. The math is really superfluous to the simple answer that is necessary to answer the question that was asked. A 24-70mm FX lens projects the same image onto the sensor whether the FX or DX setting is used and when the DX setting is chosen, fewer pixels are used.
Mar 6, 2018 16:45:22 #
rgrenaderphoto wrote:
So, on a Nikon D850 with a full frame 70-200 lens, if I put it the camera into Dx mode, do I get the 1.5% crop factor on the lens? So the 70-200 becomes a 105-300?
Yes but at a reduced mpixel. It truly is no different than taking the FF pic and cropping in post.
Using a FF lens on a crop body with the SAME mpixels means you willl get the crop factor but will the image will use the entire sensor.
The real benefit is when you have a DX lens on a FF camera in FF mode. Cheaper lens with the crop factor...albeit at lower mpixl....some DX lens on FF will cover almost the entire FF sensor with only minor vignetting in the corners. If you dont want to so post processing....use DX mode.
Cant do it on Canon btw (buggers). No option to use your cheaper lenses on your FF body
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