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DX(D90) to FX (D600) for an specific need- worthy?

nrothschild

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"RE: DX(D90) to FX (D600) for an specific need- worthy?"

nrothschild Neil is an expert in several areas, including camera support Registered since 25th Jul 2004
Wed 26-Sep-12 11:16 PM | edited Thu 27-Sep-12 02:14 PM by nrothschild

According to Bill's numbers the V1 at ISO 800 is just a hair better in performance than the D90 or D700 at around ISO 2000, or about 1.3 stops. If you add the 1.3 stops to the f/1.8 you end up back around f/2.8.

A Nikon 1 CX format at 110mm about equals the DX FOV at 200mm.

The V1 @85mm f/1.8 would have about the same noise but 3/4 stop less reach than DX at 200mm f/2.8 if you define reach as a function of stops, where 41% more focal length equals one stop more reach.

The V1 with a 105 f/2 would have comparable reach as the 200mm DX but about 1/3 stop more noise. And in a Nikkor you are back to a $1000+ lens.

(edit: the 105/2 DC is screw-driven and therefore would not AF with the V1)

The V1 would have less shutter noise which might be a big benefit in a theater situation. Except at a school play where I would imagine it is like the runway of a fashion show

The V1 would have a significant DOF advantage here (something interesting to think about since in these cases thin DOF is not the "feature" many FX users crave). At 105 f/2 the V1 would have 6.83ft DOF verses 200/2.8 on DX at 4.81 ft.

That is an unfair advantage since the V1 should be shooting more like 110mm f/1.8 for comparable performance. There it would have only 5.54 ft DOF, should such a theoretical lens exist. Still a bit better than 4.81 ft.

Those DOF numbers are from the calculator at dofmaster.com. They use a different COC (0.02mm) than Thom Hogan's worksheet (0.016mm) for DX, which I used for the calcs on the previous post.

Bill's chart suggests roughly a 1.3 stop difference in performance with the V1 around ISO 800 or so, verses D90/7000. But the V1 chart is decidedly non-linear. For example, at ISO 100 the V1 is about equivalent to the D90/D7000 at around ISO 636, or around 2.5 stops.

As a result its performance varies considerably depending on the specific ISO you want to compare.

DX has about 3.2 times more sensor surface area than CX, and that suggests a difference of 1.7 stops.

It is likely that the V1 has some "mandatory" noise reduction going on at high ISO's. It is likely that the V1 will perform at least 1/3 stop poorer than what I suggest above, relative to DX, considering all else - including any enforced NR - equal.

_________________________________
Neil


my Nikonians gallery.

This is a hot, active topic! DX(D90) to FX (D600) for an specific need- worthy? [View all] , mouramassa , Mon 24-Sep-12 06:56 PM
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