I'm glad I waited for the D7000 update. The D7100 has a 1.3x crop mode. Does that mean that when I'm using my Sigma 150-500 with a 1.5x crop gives me the FOV of a 225 750 lens. If I use the 1.3x crop mode do I get the FoV of 293 - 975? This would be awesome and very handy for my wildlife photos.
My back-of-the-napkin calculations agree with yours.
Of course, since no real magnification is involved, the only advantage is reduced in-camera file size, and therefore improved burst speed (if I read it right, it takes the D7100 from 6fps to 7fps). I assume that means you'll get a few more shots in the buffer before the camera stalls out writing them to the card. Other than that, you may as well just shoot full DX frame size and crop later.
For the reasons stated. There are times in certain applications where improved burst speed and reduced file size are more important than maximum MP counts. The fact that such things also bring with them the equivalent of a "digital zoom" is incidental.
The 1.3x crop will be very handy. I started using my D2x HSC last summer with my D2x and enjoyed the extra FoV and the smaller 6.8 mp files. I plan to order a D7100 but want to make sure Nikon doesn't introduce the D400 first. Although I shoot FX and DX I'm stickly a DX shooter when it comes to wildlife.
Fri 22-Feb-13 11:35 AM | edited Fri 22-Feb-13 12:48 PM by Chris Platt
>I'm glad I waited for the D7000 update. The D7100 has a 1.3x >crop mode. Does that mean that when I'm using my Sigma >150-500 with a 1.5x crop gives me the FOV of a 225 750 lens. >If I use the 1.3x crop mode do I get the FoV of 293 - 975? >This would be awesome and very handy for my wildlife photos.
As long as you manage your expectations. It is very difficult to capture sharp images at those focal lengths. You will have to use the exact same equipment and techniques to fight movement/vibration that you would have to use for an actual lens of that focal length on a full frame camera. So when your first few attempts are disappointing, don't blame the sensor or the lens!
Don't know why Nikon make it so difficult. 1.3 crop applys to the already 1.5x crop of the DX sensor. Why not just say 2x crop. The 2x crop effectively turns the D7100 into a large M4/3 camera That may be the real marketing reason why Nikon don't want to mention the 2x crop because of the stigma attached to it.
My D800 has this capability too. However, I don't find it that useful as the viewfinder view doesn't change, meaning you really can't see any better where your focus point is hitting - which would be one of the benefits of using it. I do understand the better burst rates and lower memory costs, but without a bigger picture to view with making the capture, I see little use for it.
>The marketing speak of 1.5 crop is misleading and confuses the >uninformed about actual dimensions.
It's misleading only if you misunderstand what the crop factor was meant to illustrate - and it wasn't just marketing.
The 1.5x factor gives those of us used to 135-format cameras a quick way of appreciating the field of view a given focal length will give us on DX. We can mentally imagine how a shot will look with (say) a 75mm lens on 135, and the crop factor tells us that we'll get pretty much the same field of view with a 50mm lens on DX.
Now that we have almost a generation of photographers who have grown up with DX, four-thirds and compact cameras, perhaps the crop factor is less useful than it was...