Nikon D90 User Manual Available For Download
The Nikon D90 User's Manual – Guide to Digital Photography is now available for download at NikonTech.com.
Both English Language (printable and non-printable) and Spanish (non-printable) versions of the D90 owner operation guide can be downloaded.
For the printable Adobe Acrobat PDF document, you'd first have to register the serial number of your Nikon D90 and then agree to a license.
The printable document weighs in at 16.44 MB (megabytes) while the size of the 300-page, non-printable version is 11.5MB.

The guide discusses the features of the D90 and how to use the camera.
August 3rd, 2009 at 6:45 am
Three times now, for no apparent reason, my new D90 refuses to take pictures, and says "This memory card cannot be used. Card may be damaged. Insert another card." However, the problem seems to correct itself, or at least has done so twice before and I hope may do so again, because I would hate to lose all the pictures on it. The display on the top reads "CHR" which I do not understand.
What causes this? How can I prevent it from re-occurring?
Any information would be greatly appreciated.
August 30th, 2009 at 3:53 pm
I had the same problem. Especially occurred when hot or cold or moist. Camera would hang, I had to remove battery to reboot it. My camera also didn't always read the max f-stop from the lens – I had to give it a little extra twist.
The problem:
in my case the lens connector didn't read all the info from the lens, which caused all sorts of minor malfunctions.Had it in for service under warranty, problem gone.
You probably have a similar problem.
Hope this helps! It is a fantastic! camera – last night I used my 70-300 mm to take a picture of Jupiter's moons – freehand, no tripod!!!
Fredrik
January 28th, 2010 at 4:06 am
How can you take HDR photo's with the Nikon D90