Tamron AF 18-250 WON'T Manual Focus with 2X Adapter
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From: infiniteMPG on 27 Apr 2010 17:24 I have a Sony Alpha A-100 DSLR camera and a nice Tamron AF 18-250 DiII zoom lens. Recently I bought a nice Tamron 90mm f2.8 telephoto to use for macro shots and also bought a 2X Teleplus converter to get in real close, all manual focus of course. Works great! Even will autofocus, too. Curiosity got to me and I slapped the 18-250 on the 2X converter and even in manual focus mode, it feels like the focus ring is locked and like I'd be grinding things if I forced it to focus. Kind of thought when this camera in manual focus mode that the focus ring drive would be totally disengaged. Any hints on what's going on and how I could use this adapter with the 18-250 lens????? Thanks!
From: Peter on 27 Apr 2010 17:32
"infiniteMPG" <57classic(a)gmail.com> wrote in message news:0571b4e4-d4ae-4a12-bc56-2b27f0c69faf(a)p17g2000vbe.googlegroups.com... >I have a Sony Alpha A-100 DSLR camera and a nice Tamron AF 18-250 DiII > zoom lens. Recently I bought a nice Tamron 90mm f2.8 telephoto to use > for macro shots and also bought a 2X Teleplus converter to get in real > close, all manual focus of course. Works great! Even will autofocus, > too. Curiosity got to me and I slapped the 18-250 on the 2X converter > and even in manual focus mode, it feels like the focus ring is locked > and like I'd be grinding things if I forced it to focus. > > Kind of thought when this camera in manual focus mode that the focus > ring drive would be totally disengaged. > > Any hints on what's going on and how I could use this adapter with the > 18-250 lens????? > The lens is probably designed so that the rear element is touching the 2x converter. To solve that issue I have successfully used the Kenko 1.4 converter on other lenses, the Nikon 18 -200 and the Nikon 80-400, with that issue. From your description of the problem I suspect you have the same issue with your Tamron. HTH -- Peter |