I received my magnifying eyepiece during the week which I ordered to help me with using manual focus in certain situations. Wearing glasses with a dSLR is not the easiest or most practical thing so I sometimes struggled (particularly in low light) with getting tack sharp images. I purchased the magnifying to hopefully make this issue go away.

The product I bought actually came with a number of adapter pieces included making it suitable for virtually all Nikon dSLR models. I believe the regular product from Nikon does not come with the adapters and a separate adapter may need to be purchased depending on your camera. I am currently using the eyepiece with my Nikon D60.

Attaching the eyepiece was easy enough once I figured out the correct adapter to use. It is simply a matter of sliding up the standard rubber eyepiece and then sliding the magnifying eyepiece down. According to the specifications the eyepiece provides 1.3x magnification. It is definitely a noticeable increase in size.

Once attached I played around with a few test images in different situations comparing auto focus against my best attempts at manual focus using the new eyepiece for the same photo. I was quite pleased with the results and could see virtually no difference between the auto focus and my manual focus (when the auto focus actually got it right).

The only down side of the DK-21M that I could find is that it is round while the standard eyepiece is rectangular for the D60. This obviously isn't a problem for all Nikon models but for the D60 in particular it makes composing the shot just a little it harder as there could be elements in the corners you can't see until you've taken the photo.

All in all I'd have to say I'm pretty pleased with it.