Opteka 2x Telephoto Lens for Pentax Optio M60, M50, E60, E30, A30, A10, 750, 555, 550, S5N, S5I, S50, S40 and S4 Digital Camera

I don't know why they sell something that had a working problem. This create a blur all around and a undesirable "tunneling effect".

Lens caps wrong size. Do not stay on. Called and they said they were just mean't for shipping and the bag was to be used instead. He said he would go to the shipping room to see if they had any others to send me, Like Right!

Does what it says - would have been better to explain how the lens attaches to the camera (I assumed it screws on, but it attaches magnetically). Good value.

Product advertises doubling camera zoom. at my estimate I can see possibly 40% increase. Produces some perimeter distortion but actually an interesting product.

There is way too much vignetting with this lens unless I "zoom" the standard camera lens out quite a bit, however I can make things appear to be considerably closer when I do "zoom" enough so that they appear to be closer than they would appear to be...

Unfortunately, the quality and incremental magnification of the resulting image do not justify the inconvenience of carrying and attaching the lens. The take home lesson for me is that if I want the features of my old single lens reflex film camera I...