My D300 has recently developed the tendency to lose communication with AF-S and AF-D lenses and default back to the last used Non-CPU lens stored in the menu.
Depending on the last Non-CPU lens, the exposure may be several stops over or under. It can also be fairly close if the Non-CPU lens has a max aperture that matches the AF lens mounted.
If I switch to manual mode from Aperture or Shutter Priority, I can still dial in the exposure fairly close.
If I grasp the lens body and work it back and forth and up and down within the limits of the slop of the mount, I can frequently restore communication for a short while.
This occurs with more than one lens and the lens works perfectly on my D700 so this is pointing me at the D300.
I have wiped the contacts on both the lens and body, removed and reseated the lens only to have the issue return. I just cleaned the body contacts with a Pec Pad and some Eclipse but the pad does not show any discoloration. If the issue persists, I am going to see if I can locate a source for a deoxidizer.
If that don't work, it looks like a vacation at Nikon will be in order.
>Hi 2pix, > >"I am going to see if I can locate a source for a >deoxidizer." > >That would be Radio shack. Deoxit is what you want. I had the >same problem as you a few years ago with my D300, problem >solved never to return.
Amazon has it readily available. I use it once a month on all my contacts. You would be surprised at the amount of dirt there is on the contacts
I use LPS, it can be sprayed directly on live computer boards so it should be safe. Most well stocked hardware, electronics stores, and auto supply houses carry it. I spray a little on a q-tip and wipe the contacts with the q-tip. It might cloud the mirror if you got some on it so be careful. Some lenses are worse than others for oxidation on the contacts. I have a Tamron that is really bad about oxidation. Too bad, but it is my favorite carry lens so I just re-clean every few months and live with it.
I was wondering about that grease that you get for treating the contacts on light sockets, circuit boards, etc? Anyone brave enough to try it?
Papa Smurf says that life is uncertain, eat dessert first!
Great to hear you had a good experience with Nikon El Segundo. I have dealt with them numerous times, always satisfactory. Of course they are a mile away from my house so I get to drop off and pick up and ask questions.