D7100 1.3 crop

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mikew_RIP

Senior Member
Struggling a bit to be sure of this and the instructions are no help,using the full sensor 400mm equals a FOV the same as a 600mm but what FOV does the 1,3 crop give with a 400mm,i arrive in my mind that the 1.5 is 5/10ths of the original lens added on,working the same way the 1.3 would be 3/10ths of the 400mm making 520mm FOV.
Or is it 3/10ths of the 600mm FOV making 780mm :confused: or have i lost the plot all together.
 
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aroy

Senior Member
mikew said:
Struggling a bit to be sure of this and the instructions are no help,using the full sensor 400mm equals a FOV the same as a 600mm but what FOV does the 1,3 crop give with a 400mm,i arrive in my mind that the 1.5 is 5/10ths of the original lens added on,working the same way the 1.3 would be 3/10ths of the 400mm making 520mm FOV.
Or is it 3/10ths of the 600mm FOV making 780mm :confused: or have i lost the plot all together.
Click to expand...

A Nikon DX has a crop factor of 1.5, so a 400mm gives an FOV of 400*1.5 = 600.

A 1.3 crop factor should give an FOV of 400*1.3 = 520.

By the way which sensor has a crop factor of 1.3.
. Nikon DX is 1.5 (24mmx16mm) - approximately.
. Canon equivalent is 1.6 (22.5mm x 15mm) - approximately.
. 1.3 crop factor sensor would be 27.7mm x 18.5mm. Never heard of this size before.
 
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mikew_RIP

Senior Member
You can select 1.3 on the D7100 as i understand the book,this makes me think its a 1.3 of a 1.5 sensor so 400mm would be a FOV on that sensor of 780mm
 
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p1lts

New member
Just remember that the 1.3x crop is exactly that. It uses a smaller proportion of the sensor, so nothing you couldn't do in PP anyway really. :)
 
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aroy

Senior Member
Apart from getting a smaller file, what is the utility of the 1.3 crop. As it is the sensor is 1.5 crop, so together you get 1.5 x 1.3 = 1.95 crop. Might as well as crop the image in the computer.
 
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mikew_RIP

Senior Member
aroy said:
Apart from getting a smaller file, what is the utility of the 1.3 crop. As it is the sensor is 1.5 crop, so together you get 1.5 x 1.3 = 1.95 crop. Might as well as crop the image in the computer.
Click to expand...

Not if your in the situation where the subject is too far away to fill the frame then you may as well crop in the camera.probaly will not do it but wanted to be sure i understood it,would have to look into it, if it increased the frame count before the buffer was full may be handy
 
S

sonicbuffalo_RIP

Senior Member
mikew said:
Not if your in the situation where the subject is too far away to fill the frame then you may as well crop in the camera.probaly will not do it but wanted to be sure i understood it,would have to look into it, if it increased the frame count before the buffer was full may be handy
Click to expand...

Pretty cool for DX owners....automatic crop! lol
 
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aroy

Senior Member
I remember that some one had posted that the buffer would take at least 99 jpeg shots in burst mode.
Here is what the D7100 specifications state


  • JPEG and 12-bit NEF (RAW) images recorded with DX (24x16) selected for image area: CL 1 to 6 fps, CH 6 fps
  • JPEG and 12-bit NEF (RAW) images recorded with 1.3x (18x12) selected for image area: CL 1 to 6 fps, CH 7 fps
  • 14-bit NEF (RAW) images recorded with DX (24x16) selected for image area: CL 1 to 5 fps, CH 5 fps
  • 14-bit NEF (RAW) images recorded with 1.3x (18x12) selected for image area: CL 1 to 6 fps, CH 6 fps
I assume these are sustainable burst rates. So you do get a 1fps advantage with 1.3 crop factor.

Here are what others have found
D7100 : How to maximize the RAW shooting buffer - Here is what I see - How about you? - Nikon D90/D7000/D7100 Discussions on Nikon Rumors Forum
 
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