New answers tagged nikon-d7000
The filter thread is 67mm on the Nikon 18-140mm f/3.5-5.6G ED VR AF-S DX NIKKOR Zoom Lens. This information can be found on the Nikon product page here: http://imaging.nikon.com/lineup/lens/zoom/normalzoom/af-s_dx_18-140mmf_35-56g_ed_vr/
It could be the RAW+JPEG mode as mentioned earlier. In that case I'd leave it as is. RAW = Good for editing and stuff - Think old school negatives JPEG = Good for quickly putting pics on Facebook etc - think of old school prints I would just set the Jpeg to a low resolution because you won't need the extra detail for editing because you'll have the Raw files ...
Have you checked file extensions? You might have your camera set in the RAW+JPEG storing mode, producing both .JPG and .NEF file for each shot, showing the same thumbnail for both of them. Also many image viewers would show both of them. Solution: Turn off RAW+JPEG mode and use JPEG only mode. Check page 85 of the Nikon D7000 manual - Image Recording ...
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