It works, whooooppeeeeedoooo.

Years ago I tried Infra red photography, using a filter fitted to the front of the D70S I then owned. Using a filter worked but necessitated the use of a tripod and long exposures, sometimes as long as 20 - 30 seconds, even on a bright day. As it is impossible to see through the lens when the IR filter is on it was necessary to focus, set the exposure timer then fit the filter; during this process focus may have been disturbed.Consequently the camera had to be stable but the vegetation I was photographing would invariably be moving in any breeze. 
These days cameras are available on E-Bay with the original sensor removed and replaced with an IR sensor. That may sound expensive, in essence it is, the D200 I bought already converted was £185. The benefit is that I can look through the lens, take an image as if I was using an ordinary camera and voila, an IR image. The benefit of the D200 is it has a 10 Megapixel sensor, compared to 5.9 M with the D50 etc.

You may buy filters for £50, but they appear to be money ‘wasted,’ that is you would probably be disappointed with the results, then purchase an excellent Hoya filter for £115. Compare that to buying an older Nikon and having it converted; the total would probably be about £165 - £180. Yes it’s more expensive but if you get instant results that satisfy I think the extra cost is worth it. Plus you can always switch cameras conveniently and quickly going from normal to IR. 

This image was the first I took. I didn’t make any adjustments to the camera, straight out of the box. The man who did the alterations had set it up and sent instructions; fit the kit lens 18 -55 and click. Normally the sky would show as blue but we have cloud cover today. Have a look around google images at IR images. In the search box of E-Bay have a look at “Nikon D50 IR converted camera” There’s a decent one all set up for £125. Seems like another creative use for your hobby. 

PS The same dealer does a sensor change option if you already have a “spare” camera. He will do the job for £55 - £65 depending on the camera. Any questions please ask.