December 12, 2017, 09:30:25 AM

Author Topic: FoCal – Long / Fast Lens Calibration  (Read 28445 times)

Raptors

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Re: FoCal – Long / Fast Lens Calibration
« Reply #15 on: March 10, 2014, 09:48:49 PM »
Mackguyver,

I too would like to thank you for taking the time to post your FoCal method. I have used the LensAlign
MKII, but never getting consistent results...that's why I am seriously thinking about buying FoCal. 

I have a few questions, regarding calibrating zoom lenses. I have the 1DX and would be calibrating my
200-400mm 1.4X...I do know that you can calibrate at both ends of the zoom range, but would FoCal
recognize when I engage the internal 1.4x as well as the external 1.4x?

Thanks
Raptors, I am happy to pass along things I learn and yes, FoCal would recognize the lens via the EXIF data, and would give you the calibration for any focal length you choose.  I'm guessing the 1DX treats this as two lenses in the AFMA settings, right?  I see that DxO does that, so I'm betting that the camera sees a 200-400 1.4x and a 200-400 with 1.4 engaged or something like that and there are separate AFMA settings for each at W & T.  If that's correct, then FoCal would work the same way.

Mackguyver,

Thanks...sorry for the delay, I have been out of the city for a couple of weeks.  With the 1DX, the camera is able to save independent AFMA values for use w/ or w/o the built-in extender, as well as w/ or w/o the external 1.4x.  Here are the 4 different profiles from the camera.

1) AFMA, focal length 200-400mm
2) AFMA with the built-in extender, focal length 280-560mm
3) AMFA with the built-in 1.4x extender and the external 1.4x, focal length 292-784mm
4) AMFA with just the external 1.4x, focal length 280-560mm

For the target set up, you recommend roughly 20x to 30x focal length. What is the procedure for zoom lenses? As I can calibrate at both ends of the zoom range, I gather you need to change the distance to target for each focal length?

Sorry for all the questions...thanks in advance
Raptors
I guess I didn't cover zoom lenses or think about all of the combinations when you add in (external) extenders, but that makes sense in terms of the number of possible profiles for the 200-400 1.4x (with or without the internal 1.4x and external 1.4x).

To answer your question, yes, you need to move the camera for the Wide and Telephoto measurements, and a wise man will take photos with every camera body he owns before moving the set up.  Ask me how I know that ;).

Thanks Mackguyver...as I'm going to need a fair amount of space, I will have to wait till it stops snowing!!!

Thanks again for all your time and effort

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Re: FoCal – Long / Fast Lens Calibration
« Reply #15 on: March 10, 2014, 09:48:49 PM »

mackguyver

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Re: FoCal – Long / Fast Lens Calibration
« Reply #16 on: March 10, 2014, 11:03:04 PM »
Thanks Mackguyver...as I'm going to need a fair amount of space, I will have to wait till it stops snowing!!!

Thanks again for all your time and effort
I'm happy to help and I hope it warms up for you soon!
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hovland

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Re: FoCal – Long / Fast Lens Calibration
« Reply #17 on: April 18, 2014, 11:55:40 AM »
Thanks mackguyver.
Just what I needed after some inconsistent results trying to calibrate my 135L.
I’m also new to focal, so you guide helps a lot  :)
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mackguyver

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Re: FoCal – Long / Fast Lens Calibration
« Reply #18 on: April 18, 2014, 12:05:13 PM »
Thanks mackguyver.
Just what I needed after some inconsistent results trying to calibrate my 135L.
I’m also new to focal, so you guide helps a lot  :)
I'm glad it's helpful and I also had trouble calibrating my 135L until I got better about how I set up and used FoCal. 
CPS Score: 111 points, those 0 and 1 point items really add up

mackguyver

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Re: FoCal – Long / Fast Lens Calibration
« Reply #19 on: January 03, 2017, 10:59:08 AM »
FYI, I have updated this post based on some refinements made over the last year or so.  As many of you may have new lenses from the holidays, I wanted to share this.  Also, if you have any questions, please let me know here.
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Maiaibing

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Re: FoCal – Long / Fast Lens Calibration
« Reply #20 on: January 03, 2017, 02:05:14 PM »
FYI, I have updated this post based on some refinements made over the last year or so.  As many of you may have new lenses from the holidays, I wanted to share this.  Also, if you have any questions, please let me know here.

Thanks for your efforts. Canon recommends 50x FL to target; you suggest 20x to 30x. I usually go with Canon - what's your suggestion based on?

neuroanatomist

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Re: FoCal – Long / Fast Lens Calibration
« Reply #21 on: January 03, 2017, 02:11:04 PM »
Thanks for your efforts. Canon recommends 50x FL to target; you suggest 20x to 30x. I usually go with Canon - what's your suggestion based on?

Reikan recommend 50x at shorter FLs, and a reduced multiplier at longer FLs.

http://s449182328.websitehome.co.uk/focal/dl//Docs/FoCal%20Test%20Distance_1.1.pdf
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Re: FoCal – Long / Fast Lens Calibration
« Reply #21 on: January 03, 2017, 02:11:04 PM »

mackguyver

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Re: FoCal – Long / Fast Lens Calibration
« Reply #22 on: January 03, 2017, 02:28:26 PM »
Thanks for your efforts. Canon recommends 50x FL to target; you suggest 20x to 30x. I usually go with Canon - what's your suggestion based on?

Reikan recommend 50x at shorter FLs, and a reduced multiplier at longer FLs.

http://s449182328.websitehome.co.uk/focal/dl//Docs/FoCal%20Test%20Distance_1.1.pdf
It's based on my experience calibrating multiple fast (f/1.2-1.4) lenses.  I have purchased the larger Focal target from Reikan and that has helped with the shorter lenses, particularly the 11-24.
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Viggo

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Re: FoCal – Long / Fast Lens Calibration
« Reply #23 on: January 03, 2017, 05:32:43 PM »
I did not know that the manual shots could be analyzed by FoCal, I will absolutely try this when I get my 200mm back from service. Thanks!
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mackguyver

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Re: FoCal – Long / Fast Lens Calibration
« Reply #24 on: January 03, 2017, 07:33:24 PM »
I did not know that the manual shots could be analyzed by FoCal, I will absolutely try this when I get my 200mm back from service. Thanks!
Yes, it's so much faster to take the shots yourself.  Definitely give it a try.
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neuroanatomist

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Re: FoCal – Long / Fast Lens Calibration
« Reply #25 on: January 03, 2017, 07:53:05 PM »
I did not know that the manual shots could be analyzed by FoCal, I will absolutely try this when I get my 200mm back from service. Thanks!
Yes, it's so much faster to take the shots yourself.  Definitely give it a try.

The other advantages to manual are 1) you can oversample (relative to FoCal's algorithm) if desired, and 2) you can calibrate a new model that FoCal doesn't yet support.  I started using manual mode when I got my 1D X (it was a few months until FoCal support, and even then it was semi-manual), and found it better and easier, so I never went back.
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Ah-Keong

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Re: FoCal – Long / Fast Lens Calibration
« Reply #26 on: January 03, 2017, 09:38:05 PM »
thanks for the guide!  ;D
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1251division

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Re: FoCal – Long / Fast Lens Calibration
« Reply #27 on: January 04, 2017, 02:11:40 AM »
Yes, thank you all for the FoCal usage tips.  This is a great step-by-step guide, and very handy to bookmark.  I've been thinking about picking up FoCal as well.  I've read the mixed reviews, but have concluded that this is the best tool available for the job.

A somewhat tangential topic, but there was a recent thread discussing whether or not or to what extent high-quality filters affect IQ.  Has anyone ever run the APERTURE SHARPNESS test within FoCal  on a lens with and without a given filter?  https://www.reikan.co.uk/focalweb/index.php/tests/aperture-sharpness/

If you have, I'd be curious to hear about your results and observations.

(Personally "I don't always use filters, but when I do..." I use B+W XS-Pro Clear MRC-Nano 007 filters.  On my 24-70ii 82mm; visually, I notice almost no difference and results are very sharp; however on my 70-200ii 77mm, there is a noticeable fall-off in IQ between w/ and w/out filter.) I was wondering if this before/after comparison would be useful in assessing a specific filter's quality in general and was looking forward to testing it out once I get the software.

Thanks!

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Re: FoCal – Long / Fast Lens Calibration
« Reply #27 on: January 04, 2017, 02:11:40 AM »

Maiaibing

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Re: FoCal – Long / Fast Lens Calibration
« Reply #28 on: January 04, 2017, 07:19:21 AM »

Calibration Target Set Up
Analysis and Re-Calibration (if needed)
1.   Remove the memory card, download the photos to your PC/Mac
2.   Launch FoCal, select Tools>Manual Mode
3.   Click on Add Files and select the shots you just took
4.   When they appear, make sure the AFMA values appear correctly (they should) and that you took all of the shots required

Looked at this, but cannot see any Manual Mode option.

Valvebounce

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Re: FoCal – Long / Fast Lens Calibration
« Reply #29 on: January 04, 2017, 09:15:40 AM »
Hi Maiaibing 
There is something funny with this, like manual won't show up if the camera is connected to the USB or similar, I don't have FoCal here so can't check, but it is not the easiest option to find.
I think this has been mentioned in a thread before if you know how to make the forum search provide you with any useful results! It never works for me. :-[

Cheers, Graham.


Calibration Target Set Up
Analysis and Re-Calibration (if needed)
1.   Remove the memory card, download the photos to your PC/Mac
2.   Launch FoCal, select Tools>Manual Mode
3.   Click on Add Files and select the shots you just took
4.   When they appear, make sure the AFMA values appear correctly (they should) and that you took all of the shots required

Looked at this, but cannot see any Manual Mode option.
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Re: FoCal – Long / Fast Lens Calibration
« Reply #29 on: January 04, 2017, 09:15:40 AM »