Changing backfocus with sigma macro 70mm and K-5

Pan-Tau · 12-08-2014, 11:48 AM

Hello,

this is my first posting ever but I have no idea to solve my strange problem.

I just puchased a second-hand Sigma macro 70mm 2.8 dg ex in very good conditions, though with a backfocus on my K-5. In macro-modus back focus can be corrected with K-5's AF fine adjustment (+3). So far so good. But used as a telephoto lens and focused more than 5 m the maximum correction (+10) still isn't sufficient. The backfocus characteristics seems to be changing depending on wether macro und tele-modus is used.

I hope someone could help me.

Greetings from Germany

Blue · 12-08-2014, 12:49 PM

Welcome! I moved your thread to the Lens Subforum because it will likely get more attention here.

12-08-2014, 11:48 AM	#1
Pan-Tau New Member Join Date: May 2013 Posts: 1	Changing backfocus with sigma macro 70mm and K-5 Hello, this is my first posting ever but I have no idea to solve my strange problem. I just puchased a second-hand Sigma macro 70mm 2.8 dg ex in very good conditions, though with a backfocus on my K-5. In macro-modus back focus can be corrected with K-5's AF fine adjustment (+3). So far so good. But used as a telephoto lens and focused more than 5 m the maximum correction (+10) still isn't sufficient. The backfocus characteristics seems to be changing depending on wether macro und tele-modus is used. I hope someone could help me. Greetings from Germany

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12-08-2014, 12:49 PM	#2
Blue Moderator Site Supporter Join Date: Jun 2008 Location: Florida Hill Country Photos: Gallery \| Albums Posts: 17,377	Welcome! I moved your thread to the Lens Subforum because it will likely get more attention here.