Raynox DCR-250 On Crop Camera

According to Raynox's web site, the DCR-250 is:

"Suitable camera lens: f= 75mm* or longer focal length.
*35mm film equivalent."

Does this mean it will not work on the Canon 40mm pancake lens a crop sensor camera?

Depends on what you mean by work. You will get an image but not much magnification- around 0.3:1. The crop sensor does not come into it. It's the actual focal length of the lens that matters and add on diopters like the Raynox work best with longer focal length lenses.
You would be better off using extension tubes with a short lens like a 40mm
Brian V.

With a diopter like Raynox, you can get some vignetting if you use a too wide lens.

Well, let's run a test! brb.

All images are uncropped, and have had the lightroom preset "Zeroed" applied.

My AAs ran out after the first shot, so I had to convert to using the pop-up flash. So, the lighting and shadows are horrible. The purpose of these images is to show magnification only anyway, so it shouldn't matter.

Here is the 40mm at it's minimum focusing distance with no Raynox:

Thanks for the test shots. It looks like it's not quite what I'm looking for. I did read a blog or forum somewhere that said it worked fine on a the 40mm lens so that's why I bought it. I can't seem to find the link anymore. I guess I'll just send it back to B&H. I haven't actually received it yet. It's in transit due to be delivered tomorrow, well maybe anyway since we are under a blizzard warning until Tuesday morning.

EDIT: I just checked and it will fit on my Tamron 70-300 so maybe I'll try it out and see how it works.

It should work great on your 70-300 OR your 90mm macro.

Here's a shot done with the 40mm pancake lens and the Raynox.

http://www.flickr.com/​photos/i9mark/74576957​42/

Maybe it will work after all.