The adapter has a simple lens element which increases the focal length by 1.4x. It will also degrade image quality a bit so you would need to stop the lens down for best quality. The adapter is a simple device like a TC and does not support any auto focus. Stop down metering will be required. Even though I don't recommend using an adapter with an glass element I guess it wouldn't hurt to try it out. The built in element is required to allow the lenses to focus to ∞.
Greg, There is no alternative if you want to use the Olympus lenses on a Nikon body. Of course the glass element can be removed and turns the lens into a macro, no ∞ focus. The only way to use the lenses without a glass element adapter is to get a Canon body. I have a few Pentax and Leica R lenses I use on a Canon body. You'll get good photos but I really don't like it. The Canon body doesn't have have an electronic rangefinder the way Nikon does so I fitted the Canon with a split image focusing screen. I originally bought the Canon to use my Nikon non-AI lenses with. Now that I have the Nikon Df I don't need the Canon. I also have an Olympus M4/3 body with adapters for Nikon, Pentax, Exacta and Leica R and M lenses. That works much better than the Canon plus it gives me body image stabilization which works fine for all the lenses.
As far as stop down metering, all you need to do is set the camera to aperture priority mode and set the aperture ring. The shutter speed will change as you change the aperture and the exposure will be accurate.
Nikon flange to film distance (flange to sensor) is 46.5 mm which is on the long side as compared to other brand so it's not possible to mount lenses (made for 35mm format) from other made on a Nikon body without adding a glass element. Unless of course if you don't need to focus to infinity. But this fact made it's easier to mount Nikon lenses on other cameras.
Thank you for the replies. Looks like I am limited to using my OM2n body with these lenses. Problem is that I have a nice set of Nikon autofocus lenses that are hard for aging eyes to replicate accuracy using manual focus lenses! I also have a F100 that on which all my Nikon lenses (14-24mm f2.8, 24-70mm f2.8, 70-200mm f2.8 VRII, 24-120mm, f4 VR, 50mm, f1.4., and 28-105mm f3.5-4.5 D) work perfectly. It seems a shame to let the OM2n sit idle with all that nice Zuiko glass. I don't suppose they are worth much in this modern, digital market.
I have purchased from these people 1st class adapters for my OM Zuiko glass to adapt for the Nikon F mount. There is NO glass element in these adapters and the fit and finish is superlative. You need one adapter per lens, since you actually replace the mount of the lens.
I have adapted the following lenses:
24mm F2.8 Zuiko 28mm F2.8 Zuiko 28mm F2.8 Zuiko MC 35mm F2.8 Zuiko 35mm F2.0 Zuiko MC 50mm F1.8 Zuiko 50mm F1.8 F-Zuiko 50mm F1.4 Zuiko MC 85mm F2.0 Zuiko MC 135mm F2.8 E-Zuiko
and all of them work perfectly well on my F5. Please, bear in mind that you have to manually set the aperture for focusing and then for taking the actual photo as there is no coupling between the lens and the camera.
Also, there is actually 2 OM to Nikon F adapters available, but the site is quite explicit about that, depending on the lens you are trying to adapt.
As you can see from the website, Leitax adapts many, many lenses and they are very well known. Again the fit and finish is EXCELLENT. Expensive, but worth every penny.
PS. All these lenses are quite good, but the Zuiko 50mm F1.8 really stands out at F5.6, F8. Like: "WOW". I have not tested the F-Zuiko 50mm F1.8 yet.
Interesting thread. I used OM-1s for a while many years ago when I couldn't afford to stay with Nikon. The bodies were a bit fragile, but the glass was stellar! I have particularly good memories of the 300mm F4.5. I've used several long lenses over the years, but that Olympus was by far the best I've used before the 300mm F4 AFS Nikkor. The Olympus was so much better than the Nikkor 300mm 4.5 that for some years I kept an OM-1 to use with that lens even after I was able to get back into Nikons...