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Canon 85mm Front + Back focus problem

Started May 22, 2014 | Discussions thread
Timbukto Veteran Member • Posts: 4,988
Re: Canon 85mm Front + Back focus problem

andrewdaviesphotography wrote:

I have a Canon 85mm 1.8 purchased from a certain auction site some months ago. Since getting it i have been unhappy with the focus results.

I have tried adjusting technique whilst hand holding and also been through the moire and ruler tests to attempt an adjustment.

Today i tried the battery test with 5AAs at 45 degrees to the camera on tripod 2 second timer centre spot focus.

At around 1 metre i had to dial in -20 ( the max ) on my 5D3 and -10 on my 5D2 to get it spot on, it then performed perfectly even off the camera at that distance.

I them aim it into another room at a wall clock about 4 meters away and now its front focusing and i have to return it to zero on both cameras to get it in focus.

This has left my head hurting and not sure what to do with it ( bar throwing it in a bin )

Is it possible for a lens to both front and back focus depending on the distance if so is this a mechanical fault that can be repaired does anyone know ?

thank you
Andrew

North East and Yorkshire Wedding Photography by Andrew Davies

I think you got a dud.  Local craigslist sales are the only way I deal unless some auction was incredible and for some old legacy lens and not a commodity lens.

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