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04-26-2019, 03:32 AM   #1
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Lens calibration

Something I've never done and really only just become aware of . I'm expecting my new K-70 and 50mm f1.8 today or tomorrow , is calibrating something I need to do or check ?

Thanks

04-26-2019, 03:43 AM - 1 Like   #2
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QuoteOriginally posted by Barrington Quote
Something I've never done and really only just become aware of . I'm expecting my new K-70 and 50mm f1.8 today or tomorrow , is calibrating something I need to do or check ?

Thanks
It is worth a check.

Fixing Front and Back Focus - Introduction - In-Depth Articles
04-26-2019, 04:07 AM - 1 Like   #3
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QuoteOriginally posted by Barrington Quote
Something I've never done and really only just become aware of . I'm expecting my new K-70 and 50mm f1.8 today or tomorrow , is calibrating something I need to do or check ?

Thanks
Here is a couple of articles on lens alignment/focus:How To Calibrate Your Lenses | A Simple Fix For Blurry Images (2019 Update)
https://photographylife.com/how-to-quickly-test-your-dslr-for-autofocus-issues
https://photographylife.com/how-to-calibrate-lenses

Last edited by SharkyCA; 04-26-2019 at 04:12 AM. Reason: add a link and update message.
04-26-2019, 05:04 AM - 1 Like   #4
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Get out and enjoy your new gear! Take lots of photos in order to familiarize yourself with the camera. Make sure that your technique is solid. Ask lots of questions here on the forum. And don't worry about lens calibration right away. If, after taking lots of photos and finding a consistent problem with getting in-focus results, then consider calibration. Inquire here about proper testing methods. But beware. Make absolutely sure that you understand how Pentax AF is supposed to work. Be confident in your shooting technique.
In 10 years of shooting with 5 different models of Pentax DSLR, and too many lenses to count, I have yet to calibrate a single lens. Maybe I've just been lucky. I don't know. Just try to be sure that you have eliminated any other possible cause.

04-26-2019, 05:14 AM   #5
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Barrington: Making pictures should be fun! So take your new equipment and enjoy it.


I have been shooting with Pentax cameras and lenses for more than 12 years (approx 5 cameras, 20 lenses) and I have never needed any lens calibration. Once I let my new camera AF system calibrate.
04-26-2019, 05:50 AM - 2 Likes   #6
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Thanks guys , in my OP when I said I hadn't been really aware of calibration it was only when I was researching lenses for my K-70 I came across it , so I thought I'd ask .

---------- Post added 04-26-19 at 01:51 PM ----------

Oh btw the camera & lens have arrived , currently charging the battery
04-26-2019, 06:52 AM - 1 Like   #7
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QuoteOriginally posted by Barrington Quote
Thanks guys , in my OP when I said I hadn't been really aware of calibration
While your camera has an AF fine adjust feature (it is the camera that is adjusted, not the lens), the process of doing so can be tedious. I vote with those above who suggest getting out and enjoying your new kit. If there are problems with persistent missed focus, such will be apparent in the first few days of use.

Have fun!


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04-26-2019, 08:20 AM - 1 Like   #8
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Whilst i agree with those who say get out and start taking pictures, there is a place for camera/lens calibration.

Fine adjustment of AF began to appear in cameras as the megapixels of our sensors got more numerous and we were able to see detail that was not possible in early digital or before that film cameras. Basically the shortcomings of the Phase-Detect autofocus systems (viewfinder method) were revealed. PDAF tolerances when built at the factory can vary, and the accuracy of the system is not 100%. (Live View is not affected as the focus is done directly on the sensor itself.)

My K-1 was not giving me what I wanted when I first purchased it, and never having had a AF/FA system in a camera before I was stumped. i need to adjust +8 on average to achieve perfect AF behaviour with my lenses. It will vary by camera, so if the OP does feel that his pictures are not as sharp as they should be when viewed at 100%, there is an easy solution.

04-27-2019, 03:59 AM   #9
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QuoteOriginally posted by pschlute Quote

i need to adjust +8 on average to achieve perfect AF behaviour with my lenses.
Hi Peter , where is that adjustment found ?

Ok I've found it

Last edited by Barrington; 04-27-2019 at 04:14 AM.
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