I need an extra pair of eyes-AF finetune for 85mm f1.8

Started 4 months ago | Discussions thread
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Jimothy H
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I need an extra pair of eyes-AF finetune for 85mm f1.8
4 months ago

Hey guys.

I recently got myself a 85mm f1.8 AF (non-D) version second hand for about $250 USD. I realised it has a focusing problem. It seems to have a back focus issue. Photos from this lens also has red/purple colour fringing everywhere, which is another indication my lens focuses at the back of my subject.

I've done the focus calibration with my D7100 at two distances: 85cm (closest focus distance) and 4m (in 1.3X crop mode), which is quite a generic distance

My personal observation:

At 85cm -4 or -5 seems to be the best setting

At Well...... I really don't know. Maybe -7 ? It seems to be unsharp across the range.

One thing really puzzled me is that the photos taken from Live view seem terrible at 4m. Is it because I've got a bad copy?

Anyway, please let me know what you guys think, if you think I need to do any adjustment on my set up, please let me know as well.

https://www.dropbox.com/sh/au4bi1zfdj9dnt2/AAClOJ_ARRGbOf8BCXQxXUlQa

English isn't my first language, so sorry for any grammatical and spelling mistake in advance.

ps: The photos are still being uploaded to dropbox while I'm writing this page. There should be 5 photos per folder.

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