I recently bought a used D700 and no matter what len or setting I use there is a black ring around my images. What can I do to fix this?

You most likely are using a DX format lens and the D700 is a full-format sensor so it will create the "vignetting" effect you described. Try the body with an FX lens, or use the settings to dial back the sensor to accept a DX lens. Hope that helps.

I love my D700, but if I was getting a new camera I'd get the D800. The files are definitely going to be much bigger and that's a consideration to make since it'll make loading and editing RAW files more difficult. However computers are constantly getting faster and hard drives are cheap. I have network attached storage and it takes a second or 2 to load the D700 RAW files in Lightroom 4. I like the larger megapixels of the D800 for zoom purposes. If you set your D700 to DX crop mode you get an image that's less than 6MP. On the D800 in DX crop mode, the image is probably going to be larger than the 12MP of the D700. I'm not sure about the white balance on the D800, but the D700 goes towards the green, so I have to adjust that on most photos I take. Also the D800 records video. It's a capability that might or might not interest you, but I wish my D700 had that capability.

How many shutter revolutions?

If you mean how many clicks or actuations on a Nikon D700 camera, you can google the question and get your response there.

Does having one CF card slot make this risky for paid work? If yes than I am buying a new D610. Thank you!!!

I think it would be hard to quantify the risk. 2 slots would reduce that risk but I would recommend a different Nikon if you're thinking of buying the D700 new from Amazon. For less that what Amazon sells the D700 for ($3400) you could get a D800 ($2800)or D800E if you want to spend a little more than the D700 costs. The D800/E accommodate 1 CF card and 1 SD card. I'm not a professional but I've taken almost 20,000 shots with my D700 since I bought it new about 1.5 years ago. I use Lexar Compact Flash 1000x UDMA cards (16GB and 32GB) because they're fast. I haven't had any failures yet. In the 12+ years that I've been doing digital photography I've only had failures with Viking cards so I quit buying that brand. I've also used SanDisk, Kingston and Transcend brand cards with no problems.

Package Dimensions L x W x H	30.5 x 23.6 x 17 centimetres
Package Weight	1.72 Kilograms
Product Dimensions L x W x H	14.7 x 7.7 x 12.3 centimetres
Item Weight	2.37 Pounds
Brand	Nikon
Colour	Black
Continuous shooting speed	5 FPS
Has image stabilisation	No
Included components	Camera Body Only
Max Focal Length	1.5 Millimetres
Minimum shutter speed	30 seconds
Model year	2008
Plug profile	Nikon F
Part number	25444
Water Resistance Level	Not Water Resistant
Zoom Type	Optical Zoom
Expanded ISO Maximum	25600
Autofocus Points	51
Focus type	Auto Focus
Maximum shutter speed	1/8000 Seconds
Aperture Modes	F2.8-F16
Effective still resolution	12.87 MP
Guaranteed software updates until	unknown

D700 Body Only (12.1 MPix, ISO 100-6400, HD Video)

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