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Indexed info on FF(front focus) / BF(back focus)

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Bob J View Drop Down
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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Topic: Indexed info on FF(front focus) / BF(back focus)
    Posted: 09 August 2007 at 19:07
This index to useful FF (frontfocus) / BF (backfocus) information is a work in progress...



General info on Focus:

Circle of confusion (Wikipaedia)

Circle of confusion (Northnet)

Depth of field (Luminous Landscape)

Program to help understanding of focus



How AF works on SLRs:

Explanation of how Minolta AF works (7000)

General info on SLR AF principles by Doug Kerr



Focus Problems:

Info on Focus problems from Leon Goodman

Maybe it isn't backfocus - M Hohner - Don't recompose

Understanding issues on 'Keeping it Sharp'

Focus problems guide by Leon Goodman



Backfocus on other systems:

AF and backfocus on Canon kit

Adjusting backfocus on Video - Video University

Canon lens focus adjustment



Diagnosis:

info on Backfocus diagnosis from Digital Knowledge Base

Diagnosis - Michael Hohner's take .



Test Charts:

Jeffrey Friedl's article about focus test charts (contains test charts for download)

Jeffrey Friedl's focus test chart (direct link)



Cure:

Focus Shift Adjustment-AF Lens Operation - Pete Ganzel

Pages from 7D repair manual

Pete Ganzel's 7D adjustment pages

General discussion on FF/BF DIY adjustments (a700 and other cameras)





Dyxum forum postings, with originators and summary:



KM 7D

2manycameras - BF diagnosis

redstripe - more focus tests

photomaniac - Service turn-around

bmb77 - Service turn-around

radi9red - Misdiagnosis?

maxxum7d1 - problems reproducing BF for service

coffeebean - focus problems

since-z-gsi - focus problems

untimoamore - diy fix

dirk - sending to service

dirk - BF link to cleaning technique

joe bloggs - BF worse in low light

gnnbtrn - service

peter.s - repair in bancock

Bob Janes - general discussion on FF/BF issues



KM 5D

aarif - testing 5D for focus errors

Joe Bloggs - backfocus on some sensors only

Evolution - DIY adjustment gone wrong

Rno - Backfocus Fix on 5D

piko4566 Service

Evolution DIY Adjustment

Ivan Lee - BF/FF Issues



Sony A100

Mauricio11 on BF/FF adjustment

simima BF Testing

bharnois exchange after backfocus

madcat207 Service

stueyman Service

Ridley Service

Artur Diagnosis

Jan J Diagnosis

skaegget Extensive Issues post

leonbidon - Diagnosis



Sony a700:

General discussion on FF/BF DIY adjustments (applies to other cameras)

Edited by rovhazman - 04 October 2013 at 15:10
 



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Bob J View Drop Down
Admin Group
Admin Group
Dyxum Administrator

Joined: 23 December 2005
Country: United Kingdom
Location: London
Status: Offline
Posts: 25223
Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 10 August 2007 at 11:11
This is a new addition to the knowledgebase - constructive ideas or contributions to improve it as a forum resource are very welcome.. :-)
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