MRHooker2u Loc: Kingston, WA

Benefit/drawback of setting a DX crop factor on a Nikon FX camera versus a 1.4 Teleconverter versus cropping in PP.

CHG_CANON Loc: the Windy City

The DX crop reduces the pixel resolution of the resulting image file. Let's take a 24MP camera like the D750. Your largest option for the DX crop gives you 10MP files. Throwing away all those pixels could be a pretty poor setting if you need to do more with that image file than what the camera gives you.

A teleconverter 'enlarges' the image circle over the sensor, in the case of 1.4x by 40%, where the sensor then 'crops' a full-resolution image from that enlarged image circle, such as 24MP of the D750 example above. There's more glass involved in this magnification, so you lose 1-stop of light / effective aperture. And, depending on the equipment, there may be a noticeable loss of image quality, although typically not by much from the major brands like Nikon or Canon extenders and lenses.

R.G. Loc: Scotland

Quality-wise, cropping in PP gets you to the same place as using DX crop mode in-camera, but shooting FF then cropping gives you far more framing possibilities compared to using DX mode.

ELNikkor

I use DX mode on my D750 when I want the smallest possible file-size. (Also go to "Small, Basic, Size Priority" jpeg. settings) Gets around 500-600 kb files, good for sharing out to friends with cell phones, internet sites, or for documents.

Robertl594 Loc: Bloomfield Hills, Michigan and Nantucket

Personally, I would only use the largest file size when capturing. You can reduce the size of the files in post. What happens if you get the photo of a lifetime and it is in basic JPEG tiny image? Not much you can do but wish you had a larger file size for printing.

Of course, it depends on your ultimate use of your images.

Celtis87

Thanks. I found that really helpful, and I didn’t even ask the question.

stan0301 Loc: Colorado

these days software lets you do (very well, and in a comfortable environment) nearly anything you want - check out Topaz