If I'm understanding it correctly, just like a DX sensor "crops" an image relative to an FX sensor, the D500 offers a 1.3x crop mode, which, in effect, crops the DX sensor. So, if I were to shoot with a lens that was 600mm on an FX body, putting that lens on a compatible DX camera gives me the equivalent of 900mm, and using 1.3x crop on the D500 provides the equivalent of 1170mm. Is that correct?
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#1
Posted 17 February 2016 - 08:30 PM
#5
Posted 18 February 2016 - 08:30 PM
Basically, I'm thinking that, for those of us who shoot with long lenses, the 1.3x crop could substitute for a telextender, allowing that there are trade-offs. So, for example, my 600mm (FX) / 900mm (DX) lens would be equivalent to 1170mm DX with 1.3 crop vs. 1260mm with a 1.4 telextender. Using the 1.3 crop, I would not lose an f/stop, I might be able to shoot at a higher ISO, and I would not be placing more glass between the lens and the sensor; however, I would be reducing my magnification (1170mm vs. 1260mm) and I would be losing sensor pixels (24x16 vs. ~ 18.5x12.3). Does that make sense?
#6
Posted 19 February 2016 - 01:10 AM
However, as mikew pointed out: when you crop in post processing all the above applies also, but you have extra margins to reframe the cropped area.
#7
Posted 19 February 2016 - 02:05 AM
You will have to remember that when you crop (in post or with the 1.3 crop doesn't matter), the larger magnification will lead to more prominent noise patterns and a lower DR. There are situations when those factors get worse than when raising ISO to compensate for a TC. The larger magnification can also make atmospheric haze more prominent than if you used a TC.
- TBonz likes this
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