In Boz' wonderful page he explains the difficulties with using Adaptall mount lens with the KA adapter. I don't quite understand what he is saying. I have a bunch of Tamron lens that I want to use on my new *ist D (in the future of course) but don't understand what limitations they will have. I have a 17/3.5, 35-105/2.8, 80-200/2.8, 90/2.5, 180/2.5, 350/5.6, 400/4, and 500/8. What are the practical limitations on use of my Tamrons? I looked back in the archives a couple of years but came up with only the info below. Please help.
Warren <<<http://us.f144.mail.yahoo.com/ym/ShowLetter?YY=13073&order=up&sort=date&pos=1 The Tamron KA Adaptall Mount When Joachim Hein read the above discussion, he immediately understood the roots of the exposure problems that some Adaptall lenses have. These are all "slow" lenses with minimum aperture setting of f/22 and an "AE" setting or f/32 and no "AE" setting In the latter case, f/32 is converted to "AE"). "AE" is the Tamron equivalent of the Pentax "A" setting. Looking in the second column of the table above, we see that there is no contact pattern for lenses with apertures ranging between f/4.5 or slower and f/22. Tamron solves this by making the Adaptall mount indicate a maximum aperture of f/4 and warning in the mount manual that the photographer must watch the aperture read-out in the view-finder (not available with P30/P50!) to ensure that only values within the true aperture range are used.>>> ===== Warren Xato For where to go when you know when [EMAIL PROTECTED] __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com
