Hi Robert. It will turn the 50 into an 85 F3.4, and the 28 into a 47 F4.8, both should work fine. The 35-105 becomes an F6 and may not autofocus very well, anything over 5.6 seems "iffy". I just tried the converter on a 70-210/3.5 and wasn't pleased, sometimes it focused OK, sometimes not. This was on a ZX-5n, the ZX-L mileage may vary. It's a great converter but you do need to "pre-focus" to get in the ballpark, it will take over from there. My favorite use for it was to turn a 50/1.4 into a sort of 85/2.4 macro. The ZX-L (MZ-6) has recieved good reviews but I've never tried one. Keep in mind the 1.7x is usually rather hard to find and pricey.
Don > -----Original Message----- > From: Robert Woerner [mailto:[EMAIL PROTECTED] > Sent: Saturday, August 07, 2004 9:08 AM > To: [EMAIL PROTECTED] > Subject: Pentax 1.7X AF Adapter > > > Hello, > > I have a friend who is considering moving into AF Pentax film SLR from MF > Super Program. She has the excellent A 35-105 f3.5, A 50 f2.0 in > addition to > a Gemini 28 f2.8. I have recommended the ZX-L due to budget constraints > (otherwise I'd recommend the MZ-S). My question is: > > How well will the Pentax 1.7X AF adapter work with these lenses? She is > considering purchasing this instead of buying AF lenses at this time. > > I assume there will be a light loss making an f2.0 into an f4.0, etc. > > What are opinions good/bad about the ZX-L? From my reading it has > impressive > specs. > > Thanks in advance, > > Robert > >
