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Archive 2016 · Math Help Please...

  
 
ponz924
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p.1 #1 · p.1 #1 · Math Help Please...


I'm currently shooting with the Nikon D810. Lately I've been heading to the nature sanctuary to shoot some eagles.

My question is: Would I gain any noticeable reach by picking up a Nikon D7200? My "fuzzy math" is telling me that it would be wash.

Thanks in advance - Ponz

ps - Note that the D810 is a 36.3mp sensor and the D7200 is 24.2mp

Edited on Apr 10, 2016 at 01:34 PM · View previous versions



Apr 10, 2016 at 01:28 PM
tkhasawinah
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p.1 #2 · p.1 #2 · Math Help Please...


yes, 50% more reach, i.e., a 200mm lens would give you 300mm on that cropped body.


Apr 10, 2016 at 01:31 PM
ponz924
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p.1 #3 · p.1 #3 · Math Help Please...


tkhasawinah wrote:
yes, 50% more reach, i.e., a 200mm lens would give you 300mm on that cropped body.


But what about the megapixel difference ? Note that the D810 is a 36.3mp sensor and the D7200 is 24.2mp

Ponz



Apr 10, 2016 at 01:34 PM
DocsPics
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p.1 #4 · p.1 #4 · Math Help Please...


Try shooting in DX mode on the D810. That gives you more reach....and you're sill behind the wheel of the D810 (Nikons finest machine ever IMHO)


Apr 10, 2016 at 01:38 PM
fosofos
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p.1 #5 · p.1 #5 · Math Help Please...


Please excuse me butting into the thread, but I just wanted to say that my understanding is that the focal length of a lens does not change if on a body with a crop factor--but that the increase in size of the image is from the pixels in the cropped area being enlarged to the size of a full-frame sensor, and that if one compares images from a 200mm lens on a body with a crop factor of 1.5, which gives the same field of view as a 300mm lens, and then compares those images to those taken with a 300mm prime shot on a body with full frame sensor, there would be, with everything else being equal, degradation in the images shot on cropped body with respect to those shot with a 300mm lens. I've yet to confirm this with the gear I have, but hope to do in order to compared the "apparent magnification" with the actual magnification.





Apr 10, 2016 at 04:18 PM
morrismike
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p.1 #6 · p.1 #6 · Math Help Please...


fosofos wrote:
Please excuse me butting into the thread, but I just wanted to say that my understanding is that the focal length of a lens does not change if on a body with a crop factor--but that the increase in size of the image is from the pixels in the cropped area being enlarged to the size of a full-frame sensor, and that if one compares images from a 200mm lens on a body with a crop factor of 1.5, which gives the same field of view as a 300mm lens, and then compares those images to those taken with a
...Show more

The crop factor comes back to "35mm equivelant". Take a picture of a bird with a 20mp FF using a 300mm lens. Repeat this same excercise for a DX with a 200mm lens. The pictures will be the same (size and MP).



Apr 10, 2016 at 05:42 PM
arbitrage
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p.1 #7 · p.1 #7 · Math Help Please...


D7200 would be equivalent pixels on target to a 54MP FF sensor. The math is 24MP x 1.5x1.5 (you have to square the crop factor).

So yes you would gain some pixels on target 54 vs 36. In good light where the high ISO benefit of the D810 isn't a factor the D7200 would yield the better image.



Apr 10, 2016 at 08:22 PM
Photo Scout
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p.1 #8 · p.1 #8 · Math Help Please...


arbitrage wrote:
D7200 would be equivalent pixels on target to a 54MP FF sensor. The math is 24MP x 1.5x1.5 (you have to square the crop factor).

So yes you would gain some pixels on target 54 vs 36. In good light where the high ISO benefit of the D810 isn't a factor the D7200 would yield the better image.


Like arbitrage is saying, the pixel density is the thing that makes the difference. D7200 would have higher pixel density than the D810 and that's what would (potentially) help you get more detail on a distant subject.



Apr 11, 2016 at 05:48 PM
ponz924
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p.1 #9 · p.1 #9 · Math Help Please...


That's an interesting equation. Why square the crop factor? Just curious.

I've been watching an eagle nest that is at least 450 feet (137 meters) away. So far, that attached image is the absolute best I can achieve, with a tremendous amount of post processing.

Regards,
Ponz


arbitrage wrote:
D7200 would be equivalent pixels on target to a 54MP FF sensor. The math is 24MP x 1.5x1.5 (you have to square the crop factor).

So yes you would gain some pixels on target 54 vs 36. In good light where the high ISO benefit of the D810 isn't a factor the D7200 would yield the better image.










Apr 17, 2016 at 06:58 PM
ponz924
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p.1 #10 · p.1 #10 · Math Help Please...


That's an interesting equation. Why square the crop factor? Just curious.

I've been watching an eagle nest that is approximately 100 meters away. So far, that attached images are the absolute best I can achieve, with a "tremendous" amount of post processing. Shadow pulling, etc...

I know I'm probably being unrealistic given the distance.

Regards,
Ponz


arbitrage wrote:
D7200 would be equivalent pixels on target to a 54MP FF sensor. The math is 24MP x 1.5x1.5 (you have to square the crop factor).

So yes you would gain some pixels on target 54 vs 36. In good light where the high ISO benefit of the D810 isn't a factor the D7200 would yield the better image.















Apr 17, 2016 at 07:02 PM
ponz924
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p.1 #11 · p.1 #11 · Math Help Please...


OK - Please check out Northrop's analysis in this video.

Specifically FF to 8:41 in the video:



Ponz



Apr 24, 2016 at 02:59 PM





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