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D7100 - D750

d7100 d750

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6 replies to this topic

#1
iNYONi

iNYONi

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Well it's been a week since I got my new camera and I thought I would do a little test, mainly for myself. I wanted to witness the "Crop factor" of the DX camera plus see what if any difference there would be in picture quality.

 

I put my Nikon 50mm 1.8G lens on both cameras, both on exactly the same settings and taken from the exact same spot. The subject is a little stuffed toy belonging to my daughter against a plain wall.

 

F1.8, exposure 1/80 and 800 ISO. (the only difference was the white balance in the D7100 as I forgot to change this).

Attached Thumbnails

  • D750.jpg
  • D7100.jpg


#2
Russ

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Whoa! The crop factor crops it! Who woulda thunk it?! :P



#3
iNYONi

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    Rob

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Whoa! The crop factor crops it! Who woulda thunk it?! :P

hahahaha, yeah I know. :D  :D  :D  Cheers Russ. ;)

 

Joking aside, I see everyone giving examples in %'s and numbers but I wanted to do a real world test. I'm blown away with the amount of picture lost using the FX lens on a DX camera. My 50mm is my new friend all over again. Where I would normally have had to use my sigma 10-20mm I can "almost" get away with using the 50mm.  

Today I plan to do a massive NO NO..(there are so many "Experts" out there in YouTube land  saying I STRONGLY advise you not to)...and use the Sigma 10-20mm DX Lens on the D750. I know it will crop the picture, I know I wont get the benefit of the Full Frame....but hay.....guess what........I dont care. :P  :P  :P  :P  ;)  :D It's My Camera and my Lens...and If I get a crappy picture.....I can delete it.....AWESOME. Or who knows, I might even get a Decent picture.....I'm going to the Dark Side. Wish me luck.

 

hahahahaha. Think I've had too much cough medicine this morning. :wacko:



#4
Merco_61

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Rob, don't forget that you can turn the auto-crop off and recompose and crop in post. This means that you might be able to get a wider view than the DX mode provides. As you well know, vignetting can even enhance the photo in some cases. 10MP in crop mode is quite usable, by the way. We got by on 6, and even 2 for PJ for years.



#5
iNYONi

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Rob, don't forget that you can turn the auto-crop off and recompose and crop in post. This means that you might be able to get a wider view than the DX mode provides. As you well know, vignetting can even enhance the photo in some cases. 10MP in crop mode is quite usable, by the way. We got by on 6, and even 2 for PJ for years.

Thanks Peter, I wasnt sure if that would work or not. I'll turn it off and see how it looks. When I have the 10-20mm on and look through the view finder, it's more like an extreme fisheye lens. I'll have a play during my lunch hour and see what I can get. I agree that in some cases the vignetting actually adds to the overall feel of the picture, I used this in the pictures of the Cathederal I posted last week.



#6
iNYONi

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This was taken wide open at 10mm (Sigma 10-20mm) on the D750

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  • _RDM0361.jpg


#7
RossCumming

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Hi Rob,

 

Since I am stuck between a rock and a hard place and need to sell a couple of lenses to fund any new lens purchase, my workhorse lens for my FX camera is my 10 year old 17-55mm F2.8 DX lens. The lens's quality is not in question and I have no issues using it on an FX body. I have one of the front buttons on the camera programmed to switch between FX and DX crop so I can quickly switch between the two modes without dropping the camera from my eye and I can very happily use the 17-55 DX lens in FX mode from around 28mm up to 55 with no vignetting making use of the full FX sensor with my DX lens.

 

I also still use my 10.5mm F2.8 DX Fisheye on my FX body as well with no issues.

 

I would really like to offload my 17-55 F2.8 DX and my Sigma 100-300 F4 (with x1.4 tele) to part-fund a 24-70mm F2.8 but until then, I am happy enough with my DX lens on my FX body since the image quality from this lens is outstanding anyway.

 

One other unintentional "benefit" of using DX lenses on the D600/D610, No matter what other people say, there is still an issue with dirt/oil spots on the sensor and on my D610 it is mainly in the bottom right hand corner (top left of an image) and using the DX lens removes this problem since that part of the sensor is not covered by the DX lens when used in DX crop mode ;-)

 

My sensor was cleaned by AJ Johnstone in Glasgow earlier this year before we went to Norway and it is as dirty as ever and it absolutely looks like oil/moisture marks rather than dirt marks.

 

Ross







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