Teleconverter magnification comparison. (5 imgs)

Started Aug 25, 2013 | Photos thread
Nicols Contributing Member • Posts: 865
Re: Klaus...Groups and Elements...

brandrx wrote:

Everything looks identical except for one thing. In your first image it appears that the rear element sticks out a couple of milimeters. Mine is completely level with that black ring with the lines (grooves) around it and has three screws in it.

Yes, it sticks out about 2mm.

EDIT: Another quick look at my Promaster Spectrum 7 1.7X Pz_AF shows that it too sticks out a couple of millimeters and looks identical to your image below. I also think that if you measured the diameter of the glass that can be seen in the rear of your's, you will find it is probably 25mm, which is the same as the Promaster (my Kenko measures about 27mm).

That is as you suppose: 25mm diameter

It seems that my Kenko is identical with the version that has been sold as Promaster 1.7x: Same scale increase, same diameter and position of the back element. Maybe for some time it was sold with this brand, and later they changed. Who knows…

The reflections are hard to count. One appears only approaching the eye to very close distances, and I suspect that some of them are probably two, but I am not able to distinguish clearly the two images…

Thank's a lot, Ron, for your help.

Cheers - Klaus

 Nicols's gear list:Nicols's gear list
Pentax K10D Pentax K-5 Pentax K-3 Pentax smc DA 16-45mm F4 ED AL Pentax smc DA* 300mm F4.0 ED (IF) SDM +16 more
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