On 10 Jun 2004 at 19:30, Kostas Kavoussanakis wrote: > We had discussed in the past (Rob?) that the manual recommends against > using the adapter with some lenses (eg 15 or 18) and warns that they > may be damaged if combined.
Hi Kostas, We did discuss the AF TC. The reason the manual warns against use with the 15mm (and I assume the 18mm as I don't have one to check) is that the rear elements of this lens protrudes to the point that they would have a clash of glass should they be paired. Not a good thing to do. > Has anybody used the AF adapter F with the F or FA50/1.7 (I have the > latter but I think they are the same)? I am quite tempted by a semi-AF > 85/2.9. at half the length of the Tamron 90SP. How much of a hit in > resolution should I expect? I would like to use it for portraits. I haven't used the AF TC in conjunction with the lenses you cite above however I have used it with the several other 50mm lenses and it worked OK. Of course most TCs are designed to work best with lenses of short tele length or longer. So YMMV using it with relatively short lenses. What I can say though is that if the lens is good enough you will loose very little resolution at mid range apertures and suffer very little loss of contrast. IOW it's a pretty good TC overall, you should find it pretty handy, I have mine. 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
