FoCal question
/forum/topic/1164335/0



PatrickSweeney
Registered: Oct 12, 2004
Total Posts: 405
Country: United States

OK, do I print out the targets, display them on the screen, what?

The software is unhelpful at this point, or Windows has scattered files further than I thought. (Still finding them.)



Andrew J
Registered: Mar 20, 2006
Total Posts: 3489
Country: United States

print



Mexecutioner
Registered: Dec 07, 2010
Total Posts: 114
Country: United States

print on matte paper using an inkjet printer to avoid reflections from laser toner and the paper itself.



mco_970
Registered: Apr 03, 2009
Total Posts: 5290
Country: United States

+1 for matte paper w/ an inkjet. I used a luster type paper for a while, and have better results on matte.



RAF09
Registered: Mar 04, 2009
Total Posts: 295
Country: United States

Targets are included in the download, 2 sizes. Non glare is very important as is good lighting and not fluorescent.



vsg28
Registered: May 07, 2012
Total Posts: 1227
Country: United States

I actually tried out the targets on my tablet and it worked nice enough. I did have a better time with target acquisition with the printed targets though.



328iGuy
Registered: Dec 23, 2003
Total Posts: 575
Country: Canada

Definitely go with printed targets, you don't want any chance of glare to mess with the MA.

You will find a folder under FoCal that has all the target images in it.



dgdg
Registered: Jul 20, 2011
Total Posts: 2889
Country: United States

Definitely print your target.
I believe there is a short manual included with the download that seemed to cover everything step by step. I found reading it through a couple times was helpful. Setting up your target in good light at the right distance is the most hands-on thing you will need to do.



Kenneth Farver
Registered: Nov 06, 2006
Total Posts: 1045
Country: United States

Anyone have a good distance to use for each focal length?
I tried 50x and that's not working.
They said to try closer.
I then got the small square to check OK but when you zoom I get the X from the software.
Sent them screen shots again today.
Previously (before latest beta) I would set up the target, start the test, and the test would say it lost the target.
I've spent way too many hours to try to get this software to work.
Any help would be appreciated, thanks, Ken.



dgdg
Registered: Jul 20, 2011
Total Posts: 2889
Country: United States

25-50x focal length should be good
With help here I realized my shutter speed was too slow on my 400mm
Once I put a spot lamp on the target and boosted the iso to 320-400, calibration was fine. Even on a solid tripod, I had issues completing the test if my shutter speed was not 1/FocalLength.
Focal does want to see the whole target adequately when zoomed, so make sure you are not too close or far away.



scalesusa
Registered: Sep 02, 2008
Total Posts: 2453
Country: United States

From the manual

3.2 Printing the Target
Ideally, the target should be printed on Matte Heavyweight Paper with an Inkjet printer.
When printing with a laser printer, the toner can be quite reflective and may upset the analysis of the image and result in a less reliable result.
Printing on standard (lightweight) paper will work OK, but there can be some issues with the paper curling over time. Also, when using a smaller macro target at close to 1:1 magnification, fibres on the paper can become a significant part of the image and reduce analysis performance.



Suresh T
Registered: Jan 28, 2007
Total Posts: 65
Country: United States

Kenneth Farver wrote:
Anyone have a good distance to use for each focal length?
I tried 50x and that's not working.
They said to try closer.
I then got the small square to check OK but when you zoom I get the X from the software.
Sent them screen shots again today.
Previously (before latest beta) I would set up the target, start the test, and the test would say it lost the target.
I've spent way too many hours to try to get this software to work.
Any help would be appreciated, thanks, Ken.


It did take a bit of practice for me to get the target setup to work both for normal and zoom, particularly at 50x with longer zoom lengths (200mm+). What worked for me (even at 50x for 300mm) is making sure the camera was directly in front of the target, at the same height, with camera sensor plane parallel to the target (or as close as I could get it :-)), etc. Then, zoomed out, I try to get the target as centered as possible, then zoom in and make minor adjustments as needed. It was tricky though at 50x with the heavier 70-300L at 300mm.



PatrickSweeney
Registered: Oct 12, 2004
Total Posts: 405
Country: United States

Thanks. for some reason, Windows scattered the downloads/unzip files all over the hard drive. So I had to search for them, just to assemble the FoCal folder.

Getting into it, looks like fun and I'll report on the results.



Kenneth Farver
Registered: Nov 06, 2006
Total Posts: 1045
Country: United States

I had problems getting the software to give me the "green checkmark" so I could use the software.
I believe I had a defective lens that would only lock on to the outside edge of the target.
I put my cameras in LiveView 10X and centered the target at 50X the focal length (actually a little over that)
I was able to calibrate the rest of my lenses to both my 5D2 and 1D4.
Now to go shoot and be amazed at the results.



2ndgen
Registered: Sep 28, 2011
Total Posts: 8
Country: United States

Kenneth Farver wrote:
Anyone have a good distance to use for each focal length?
I tried 50x and that's not working.
They said to try closer.
I then got the small square to check OK but when you zoom I get the X from the software.
Sent them screen shots again today.
Previously (before latest beta) I would set up the target, start the test, and the test would say it lost the target.
I've spent way too many hours to try to get this software to work.
Any help would be appreciated, thanks, Ken.


From their web site:

Focal Length Recommended minimum test distance
<10mm 0.5m (50x or greater)
24mm 1.2m (50x)
50mm 2.5m (50x)
85mm 3.5m (40x)
100mm 4m (40x)
200mm 6m (40x)
300mm 7.5m (25x)
400mm 8m (20x)
500mm 10m (20x)
600mm 12m (20x)
800mm 16m (20x)
1000mm 20m (20x)
Macro lenses Typical working distance – e.g. 0.3m for 1:1 shooting

Note that Focal length is the actual focal length of the lens (and teleconverter combination if
applicable) – the sensor “crop factor” can be ignored.



Alan321
Registered: Nov 07, 2005
Total Posts: 9957
Country: Australia

I suggest that you do multiple tests for zooms at different focal lengths, or for large aperture lenses at different apertures, or for any lenses at different shooting distances, so that you get a number of AF MA settings for each lens that cover the various shooting scenarios more completely. Now, you can only use one setting per lens in the camera at any time but you can easily change that setting if you know that you have to when you change the way you use the lenses - and Focal makes it so easy.

- Alan