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Vello lens calibration tool - $25 B&H
Posted By: madbrain, 05-12-2021, 10:02 PM

Never used one of those and I figured I have enough lenses to check for this to be worth it.

https://www.bhphotovideo.com/c/product/1439588-REG/vello_lens_2020_af_lens_c...981&
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05-18-2021, 05:02 PM   #31
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It's interesting someone finally made a knock off. The original was too expensive imo for what it was.

05-18-2021, 07:48 PM - 1 Like   #32
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I got the tool delivered today and spent a few hours calibrating all my lenses. It really is a bitch aligning the cameras properly on 2 tripods and making everything level.
I shot my tests shot with IR remote control and 3s delay. Mostly within 6ft distance except for the ultrawide and the wide end of zooms where I had to shoot closer to 2-3ft.

My results were pretty surprising. Every single lens was back-focusing. All the adjustments I had to make are listed below :

FA50/1.4 +4
DA35/2.4 >+10 (est +11)
DA40/2.8 +4
DA50 +9

Tamron 10-24 at 15mm >+10 (est +14)
Tamron 10-24 at 10mm +10
Tamron 10-24 at 24mm >+10 (est +12)
D-FA 28-105 at 28mm +5
D-FA 28-105 at 50mm +5
D-FA 28-105 at 105mm +5
Tamron 28-300 at 28mm +2
Tamron 28-300 at 70mm +1
Tamron 28-300 at 135mm +1
Tamron 28-300 at 300mm +1

I never noticed major back-focusing problems with my DA35, so that's pretty surprising it came in at +10. And I have shot the lens wide open.
I have tried shooting it on a couple of real subjects rather than the test target, and it's definitely better with the adjustment than without.

I just got the Tamron 10-24 from KEH last week, and I haven't gotten any really sharp pictures with it. Maybe this explains why.
Now I regret selling my Sigma 10-24 which was APS-C but sharper. I got the Tamron because it can shoot full frame at 15mm and above. I will likely only ever use it at 15mm.
I may consider returning the Tamron 10-24 to KEH.

My Tamron A061 28-300mm superzoom came in closest. I shoot with that lens the most. It is not optically great, though. But focus has definitely not been an issue with it.

The good news with the D FA 28-105 and Tamron 28-300 is that the adjustments were almost identical accross the focal lengths I tested.
Wasn't so with the Tamron 10-24 .

I wonder if there is something wrong with my K-1 II. It did take a fall in June of 2018. I had to sent it to Precision for insurance purposes. They said the camera was functioning normally.
I don' have another Pentax body to test the lenses with at this time.
05-19-2021, 05:10 PM - 1 Like   #33
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QuoteOriginally posted by madbrain Quote
I wonder if there is something wrong with my K-1 II. It did take a fall in June of 2018. I had to sent it to Precision for insurance purposes. They said the camera was functioning normally.
I don' have another Pentax body to test the lenses with at this time.
Glad you found it was a worthwhile activity, Madbrain.

I'm looking at the table of your results and I'll guess - your body is naturally +4 after its fall, and then the lenses vary around that.

That is within the +/- 10 tolerance of manufacture, that's why we have that setting and the calibration process.

I would immediately send back that Tamron 10-24 to KEH.

Sadly, my guess is that you can no longer do that with your DA35.

I recommend that *everyone* tests their lenses as soon as they receive them, and only purchase from vendors who accept refunds. These aren't stale bagels we can toss in the bin and shrug our shoulders, they cost serious money!
05-21-2021, 07:18 PM - 1 Like   #34
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QuoteOriginally posted by clackers Quote
I would immediately send back that Tamron 10-24 to KEH.
I'm definitely thinking about it. Still giving it some consideration. I have 60 days to return. I will make more attempts shooting with it.

QuoteQuote:
Sadly, my guess is that you can no longer do that with your DA35.
That's right, I bought it years ago. I guess the focus issue really hasn't shown in my landscape shots. Probably more of an issue at close focus I'll have to review previous shots.

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