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04-10-2013, 01:05 PM - 3 Likes   #1
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"Ghetto" Lens Calibration Chart

I came across this post on PetaPixel a while back, but I sought it out again last night because my Tamron 17-50 arrived in the mail and I suspected it might need some AF adjustments done.

http://petapixel.com/2013/03/12/ghettoca-a-diy-lens-calibration-tool-for-mic...enabled-dslrs/

So I made the chart last night. It took all of 20 minutes. I used it today (at work, to kill time) and it was very helpful in letting me see how my Tamron was performing. The numbers on the ruler don't necessarily correspond to any sort of AF adjustment measurement (I think) but nevertheless the lines help you see what is and isn't in focus, and help you track the effect your adjustments are having.

I thought it might come in handy here since a lot of posts pop up relating to focusing issues.

And here's a shot of the chart in action:

https://www.dropbox.com/s/bq1zsdq4ztfqoa2/20130410_123404.jpg

Note: If you don't have a tripod/gorillapod handy to raise the level of your camera, you can just use a stack of magazines or books to raise the level of the chart and camera until they are even with each other.


Last edited by EarlVonTapia; 04-10-2013 at 01:12 PM.
04-10-2013, 01:17 PM   #2
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Thanks for the link, I was thinking of buying the real one just to make sure my lenses are focusing ok. The GhettoCal should do.
04-10-2013, 01:23 PM   #3
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QuoteOriginally posted by Roob-N-Boots Quote
Thanks for the link, I was thinking of buying the real one just to make sure my lenses are focusing ok. The GhettoCal should do.
Yeah buddy. Save that money for some LBA.
04-10-2013, 01:33 PM   #4
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QuoteOriginally posted by EarlVonTapia Quote
Yeah buddy. Save that money for some LBA.
Yup, just pulled the trigger on a White K-01 with DA40xs this morning. Now I'm about to head over to my local camera shop to see what they have. I guess I can use the money saved from not buying the Lens-cal to splurge on some manual lenses.


Last edited by Roob-N-Boots; 04-10-2013 at 10:14 PM.
04-10-2013, 04:23 PM   #5
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I like that, it's a useful tool. Thanks for posting.
04-10-2013, 07:00 PM   #6
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Thanks for taking the time to share. I'll be checking this out.
04-10-2013, 07:31 PM   #7
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I use the gray cement sidewalk outside my front door that has one crack with short grass to focus on :-) I've only ever adjusted one lens.
04-20-2013, 12:12 PM   #8
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the guy says he is lazy.. im way too lazy to make that.... i'd have to make a trip to the store!

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