On 28 Apr 2005 at 1:24, Fred wrote: > > In my opionion most early Pentax and non- > > Pentax teleconvertors really aren't worth wasting time with, they often > > lower > > contrast significantly and introduce aberrations such as CA towards the > > edges > > of the frame. > > Hi, Rob. As far as I know, the first Pentax TC was the (6-element) T6-2X, > and I've had good luck with it - I've had trouble distinguishing its > results from those of the (7-element) A 2X-S. Are you referring to this > TC, specifically?
Hi Fred, I wasn't too impressed with the T6-2X but it was a while back, maybe the other one I was thinking of was a Tak?, again it was long ago and I didn't keep it. In any case I sold off my X-S TCs after acquiring a 1.7AF TX and now only have 2 x X-L TC and the 1.7AF TC. It's not that the 1.4X-S and 2X-S were bad they just essentially became redundant in my kit. I probably could even liberate the X-Ls without causing myself too much heartache given the lack of action they've seen even though I own three lenses to use them with. The 1.7AF TC is a little beauty though, it doesn't reduce contrast significantly, it's doesn't noticeably degrade the image quality when it's used behind a good lens. It's got a useful mag factor and only 1.5 stops loss plus it translates the lens aperture on the A capable bodies and of course can magically make manual focus lenses AF :-) The only problem that I've found with the AF1.7 TC on a manual body is that the moving elements can end up being in a close focus position so that you can't focus to infinity, the fix is simply to wind the AF screw fully clockwise. Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
