I'm still trying to decide on a D7100 or wait till I have the bucks for a D800. In pouring over the specs I notice optional 1.3 crop. Does this mean you can opt for 1.5 or switch to 1.3? Then to further complicate things we have the rumored D400,which I will assume to a DX body. Meanwhile Nikon is hyping the 7100 as the DX Flagship. thanx for reading my rant. jim
>Does this mean you can opt for 1.5 or switch to 1.3?
No. The D7100 has a DX-format sensor, which has a "crop factor" of 1.5 compared with FX. Engaging the 1.3x crop option gives you a further crop, so you end up with a crop factor of 1.5 x 1.3, or about 2x compared with FX.
I am sorry to disagree with Brian, and Mudman2, but you do not get a multiplier affect with the 1.3 crop. All the 1.3 crop does is take your 24 megapixel image and take the middle 16 megs for the image. The nice piece is that if you wish to save space and your "target" fills the "cropped" view you will save post processing cropping. If you take some shots and view the EXIF data you will not see an increase of 35mm equivalence on the cropped shot. e.g. you take a shot with the 7100 @ 200mm you will see a 35mm equivalent fo 300mm in the EXIF data. If you take the same shot with the 1.3 crop you will see no difference in the EXIF data, you will received a "cropped" image at 67% of the file size. Although I believed I would recieve the "multiplier" affect of the 1.5x1.3 in 35mm equivalence, and didn't, I still love the 7100 for all the other features and improvements it has delivered! Turbo
The biggest advantage I find of the 1.3 crop is when you are in a situation where you can't reduce the distance to your subject and the resulting desired image will not be larger than the crop area. . . (which is often the case in shooting wildlife subjects) I then switch to crop to gain faster FPS and smaller files to handle. No advantage at that point to shooting normal DX crop and dealing with the much larger file.
>The biggest advantage I find of the 1.3 crop is when you are >in a situation where you can't reduce the distance to your >subject and the resulting desired image will not be larger >than the crop area. . . (which is often the case in shooting >wildlife subjects) I then switch to crop to gain faster FPS >and smaller files to handle. No advantage at that point to >shooting normal DX crop and dealing with the much larger >file. > >Al
I found that quite useful at Bristol for driver introductions
Multiple focus points are valuable for certain subjects such as ones that move quickly from the initial focus point. This is one reason that cameras have multiple focus points, although only one may be the "final" focus point at time of shutter release. With 51 points covering nearly the entire image area in 1.3 crop, almost regardless of where the subject may move it will be "covered" by a focus point. Thus, the theory is, you are more likely to get a focused image despite the subject having moved. When not in crop mode, the 51 focus points do not cover the entire image area. As mentioned, the fact that the 51 points cover so much of the image area in 1.3 crop mode is not something that is necessarily advantageous for all types of subjects (that's why the camera includes other focus modes with fewer focus points).
51 focus points in 1.3 crop mode (or DX mode for that matter) work best for moving subjects when coupled with AF-C and back button AF. However, as others have commented in other forums, using 51 focus points is asking the camera do more work, so this may slow somewhat the camera's response time. Nothing is simple.
While the D7100 in 1.3x crop mode just provides a black box to show the image area within the entire DX frame,those who shoot live view or movies will be pleased to know that the cropped area is enlarged to fill the LCD monitor in stills mode, and masked to show only the movie area in movie mode.