My Nikon D5100 has been fell in water, did any one faced such case and what is the recommended place for repaire in Egypt?

To use Metz 45CL-1 with Nikon D5100, you need use in apperture priority mode (A), adjust same ISO and apperture in Flash and Camera (Ex: ISO400 and F: 5.6) . The flash adjust light intensity to mantain correct exposition. You need use an adapter to conect Sync cable in your camera.

Letting it dry out in a nice warm location before seeing if it worked would have been the best solution. It is likely that a lot of electrical damage has taken place and the cost of repair to the camera body my outweigh the cost of a new body. You may pay out a lot for the repair and have re-occurring problems. personally, I would cut my losses and buy a ne body for the camera.

Open your appuatue set your ISO to 200 or 1600 what ever it needs

There is no way to really answer this question as the camera was dropped. If it was dropped with the lens, then the problem could be either in the body or the lens (or both). If you have another lens try it and see if you get the same result. Otherwise you are probably going to have to take it to the shop or send it to Nikon

This is not a DIY job, you need to take your camera to a Nikon camera service center for repairs.

No. This lens lacks an autofocus motor, relying on the camera to have one. The D5100 lacks an autofocus motor, relying on the lens to have one. Adding a battery grip does not change this situation.

The D5100 only autofocuses with lenses having an internal autofocus motor. Nikon designates such lenses AF-S, Sigma calls it HSM. Lenses without the motor will only autofocus with the larger and heavier Nikon cameras such as the D7000.

Based on the fact that you asked this basic question, I STRONGLY URGE YOU TO NOT ATTEMPT TO FIX THE CAMERA YOURSELF! The problem you describe requires the services of a knowledgable camera repair man. I recommend that you go on Nikon's website and find the location of the nearest Nikon repair depot and follow instructions for return of your camera. Ask them for a repair estimate before they proceed with the work.

If your lens has a Nikon mount then yes, you can use it on the D5100. You'll have to switch to the Manual exposure mode and you won't get any exposure help from the camera's light meter.

Quantaray makes lenses with a variety of mounts for a variety of cameras. A lens with a Sony mount, for example, will not fit onto a Nikon camera. Assuming the lens has a Nikon mount, it will fit on the D5100. However, the D5100 requires the lens to have an autofocus motor. If the lens does not have such a motor then it will not autofocus. It will still work fine as a manual focus lens.

I would recommend you give Nikon a call. You can reach them in the US at 1-800-645-6687. This may be covered under their current No Fault Policy, in which case it shouldn't cost more than $10 to get them repaired or replaced.
Best Regards,
Ben

Ben Lizdas
Sales Manager
Eagle Optics
www.eagleoptics.com