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I was out shooting small birds on snow this morning. I used a Nikon 600mmF:4G VR and a D810 set to 14 bit. I used manual with auto Iso and had compensation set to -0.7. It was  bright cloudy while I was shooting. All the shots are between 71 and 72 mb. I'm using adobe bridge so I opened NXi and it confirmed the size of the photos. So did the ground covering snow provide the huge reflector that I think happened? It flooded the shot from above (cloudy) and from below (reflective) to create a photograph size of 71 to 73 MB?

That's what a D810 uncompressed 14-bit NEF produces for a file size.

Just change it to compressed 14 bit - it's a lossless compression and you file sizes will be more in line with what you expect..

E.J. Peiker wrote:Just change it to compressed 14 bit - it's a lossless compression and you file sizes will be more in line with what you expect..

I think the size has to do with the amount of light on the subject. My files of small birds taken in the woods at Magee Marsh are in the 40-45mb range which I've seen for years. I shot a Pheasant with blue sky and standing on snow and it came out at 51.25MB. So to my question is with high MB shots are the result of brighter light. I've seen this MB increase over the years in all my cameras. I guess Ididn't realize it was soo bright out.

It has nothing to do with light and everything to do with the amount of compressible information. A blue sky is highly compressible as many pixels have the same value but a heavily textured or detailed scene does not.

You've probably been using compressed 14 bit previously and somehow changed to uncompressed.