Lens Focus Testing

I just read an article that I thought was interesting enough to pass along, assuming at least some of you have SLRs! =)

Seems like I recently heard some pro photographers saying that they send their lenses in every year for re-calibration. My MarkIII has a built in calibration tool that I can use to make minor adjustments to each/any lens individually, but Iโ€™ve never really had to use it so far. Even on lenses Iโ€™ve had for years. Maybe buying โ€œLโ€ (professional) lenses is the difference, but we do have a couple of plain olโ€™ EF lenses that have never given us any trouble so far.

Anyway, when I saw this focus test article, I was pleased to have a good way to actually scientifically test each one just to be sure. If you use it and find it helpful, Iโ€™d be interested in hearing about it! I plan to test mine as soon as I have an hour to take my time and go through all of my lenses and camera bodies. Should be fun! I like that kind of thing.

Hereโ€™s what the target looks like:

And thatโ€™s the setup.

And here are the results (or what *should* be the results if your lens is in focus). If your lens is out of focus, youโ€™ll get something more like thisโ€ฆ

โ€ฆin which case itโ€™s time to send it back for adjustments!

(Oh, for the record, all of these photos came from http://photo.net/learn/focustest, not my lenses, thankfully! =)

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