I want to know if I can use a Hoya IR filter R72

That would depend on the filter.

Since Tamron has never made a lens with a fixed focal length of 72mm, I assume the 72mm is referring to the filter thread. I also assume you mean the Hoya RM72 infrared filter. The "72" in the filter name is a description of the filter and has nothing to do with its physical size. One vendor lists the RM72 filter in sizes ranging from 46mm to 77mm. As long as you get the filter to match the thread on the front of the lens then it will screw right on.

The filter doesn't go onto the camera, but onto the lens. Assuming it's the proper size, it should just screw into the threads on the front of the lens (the end away from the camera). If the lens hood is on, remove it first.

Hi,
Based on the fundamentals of retaining rings, The filter lens probably fits into the ring housing first, and the retainer ring is inserted inside of the ring, following the lens. The retainer will need to be compressed in order to fit inside the ring, but will snap into a groove once in proper position.
I hope this is helpful... Good luck.

a 46mm!

The D200 uses a different way of changing the aperture than on that old lens. Set the switch to 22 and lock it with the little lock just above it. It always has to set like this. Now the D200 will stop complaining.

Hi Karen,

I would check your white balance. I would also highly recommend some good reading. The author Ken Rockman really has this camera "dialed in". I know he addresses that problem in there. You can find it here. http://www.kenrockwell.com/nikon/d200/users-guide/d200-users-guide.pdf

Have fun with your camera!

Rob

Your camera doesn't have any filters built in, but you can simulate a lot of the filter effects in post-processing. You would be advised to have polarizing filters for your lenses, and possible neutral density graduated fiters (which do work in the Cokin System). Those are difficult to do without.

Sigma lenses sometimes need re-chipping for full compatability with certain Nikon camera. They are usually quite good about doing this gratis.
Try the Sigma on another body at the camera shop or at home (preferably and older AF film camera). If it works then its likely just a chip compatibility issue.

Check it by point the lens at an IR source, like a remote control. Click on the remote, if you can see the IR light in the LCD finder, then the camera is sensitive to IR and should work. I think it will. The specs on the CD400 is almost completely the same as the S85 (excepting the obvious differences) and it probably has a lot of the same guts.

you can get screw-in filters, but those that require adaptors or holders are more versatile, as you can use them on a variety of different sized lenses.