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I got a FLI adapter for Nikon lenses for my FLI filter wheel. It recesses into the filter wheel. The only problem with it is it goes in too far and tends to impede the filter wheel. So I leave it slightly unscrewed (1/2 turn). I used a bit of masking tape to stiffen it up as it had very slight wobble which meant some images on one side of the mount were angled slightly differently to the other side meaning it was hard to align the images.
Precise Parts is also the usual place for adapters. Starlight express have quite a few adapters so I would check them first.
I use a Nikon 180 ED at times. Its quite good but it has chromatic aberrations. A better lens would be the Pentax 67 165mm F2.8. Its perfect wide open and you can get cheap adapters off ebay and the lens is further away from the filter wheel giving more freedom for an adapter.
I got an adapter from Precise Parts where he got a t thread adapter and screw fixed it to a machined part to fit my filter wheel.
Pentax 67 75 F3.5 and 165mm F2.8 are fabulous and cheap lenses. Better than the Nikon 180ED. The Pentax 67 300mm EDIF is expensive but is as good as many scopes.
These are the lenses I have used or have seen used and give good results:
1. Pentax 67 - 75mm F3.5, 165mm F2.8, 300mm F4 (some chromatic aberration unless you get the EDIF but the regular 300mm (about $400 2nd hand or less) is good for narrowband. The 75 is worth about $85 the 165 around $100 or so.
2. Nikon 105 F2.5 AIS - very nice, not much chromatic aberration but a bit.
3. Nikon 50mm F1.8D (the g is also good but the D has an aperture ring).
4. Pentax SMC 200mm (not 67) (Marc on this site uses this one and the images are great) also the 150mm.
5. Zeiss 300mm (that'd be expensive).
6. Nikon 85mm F1.8G (good from about F2 on).
7. I don't have many Canon lenses but the 50mm of any brand is usually good. Canon/Nikon 50mm lenses are pretty close in performance.
I would stick to the Pentax 67 lenses as they are cheap, they have more backfocus are very tolerant and have metal construction and manual aperture rings. Most modern lenses need the camera to move the aperture so you need an adapter that will change the aperture (sometimes they hide whether or not it has this ability, if they don't specifically state they do then assume they don't and you'd be right 99% of the time).
Ebay lists millions of adapters that are very cheap.
Greg.
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