MacRumors came across an interesting accessory for all of you iPhone-toting photographers. Have you ever wanted your iPhone to be capable of shooting long-distance photos? Well, now it can with this new SLR adapter.

An SLR adapter is a custom case with a lens-mounting ring. It allows you to attach your SLR (Single Lens Reflex) lenses to your iPhone, which is an absolute must-have for any budding photographer. Or is it?

This isn’t the first time we’ve seen one of these SLR lens mounters. The fact is, they are generally pretty expensive and geared for a pretty narrow audience. First, you have to have SLR lenses laying around, and second, you have to want to mount them to your iPhone.

This particular SLR adapter comes with a UV filter, and works with both Canon and Nikon SLR lenses. And oh yeah, it’s pricey. The adapter will run you $250 bucks for the iPhone 4 edition, and $190 for iPhone 3G/3GS models.

The accessory comes at a good time though, as iOS 5 is expected to drop in the next few months. The new software includes a number of enhancements for avid picture-takers, including the option to use the volume-up as a shutter button, and the new Photo Stream service.

A lot of folks have noted that if they have their SLR lenses with them, they probably have their SLR cameras too, which would take much better photos. But with the iPhone, you could snap a photo, edit it and then upload it on the fly. Isn’t that worth $250 dollars? Probably not.

What do you think?