RRS Loc: Not sure

Thanks, when aligning my 600mm f/4.0 with Lens-align the recommended minimum distance is 49'2' and maximum is 98'4". Is there a max or min distance that has to be used to get reliable and repeatable results with Focal Pro? I guess I could set all of this up in my office and shoot the target across the street through an open window. Has your program (software) stopped in the middle of an alignment? I don't have a laptop.

RRS Loc: Not sure

I just got home from a day out shooting, more like fighting the wind today, but I think I will order this tomorrow morning and then compare what things are common with the Lens align. Thanks so much for all the info TriX/OnDSnap.

TriX Loc: Raleigh, NC

Go to the FoCal website and download the manual. As I recall, the recommended distance varies from 50x focal length for wide angles to 20X for long teles. If I remember correctly, I used about 35’ for my 400mm with a 1.4x extender (560mm). There’s nothing magic about the distance - you can use whatever is the distance you most likely shoot at. BTW, I originally tried Lens Align, but it was way too subjective and imprecise for me.

BtW, there are two versions - pay the extra $20 for the pro version. The lower version is limited to 400 mm and doesn’t have all the features such as acuity vs aperture. You can download and print your own target on a good printer. I mounted mine on a piece of plywood with a stand with the FoCal target on one side and a standard resolution target on the other.

RRS Loc: Not sure

Thanks. I'll do that.

OnDSnap Loc: NE New Jersey

OnDSnap Loc: NE New Jersey

Try it at both distances, compare the results. I'll test my zooms at for example 70mm, 90mm, 110mm etc. on up through the lenses range while at equal footage 70', 90',110, (just to keep it simple & within suggested lengths given by FoCal). Then compare all the data and make a choice that suits my shooting. I'll do the same with fixed focal length with respect to distance. i.e. 20', 60',80' ect.. If you feel you shoot more at a particular distance more than the others and your comparisons are noticeably different... I would probably sway to the reads outs at the distance I'm more likely to be shooting at. I think I read somewhere Canon allows for two setting per lens can be saved. Near and far. No my software hasn't stopped in the middle of a test, however don't allow the laptop to hibernate or go into a screensaver. I can't help but snicker about you shooting across the street from your office window, careful you don't get caught... in this day and age someone is more likely to think your a peeping tom. Sadly so. No long halls in you're office? Lighting the target is also important to test results. As it is out in the wild with AF. You can do great at the driving range in a fixed & controled enviroment, but get out on the golf coarse and you spend more time in the woods looking for the ball, if you know what I mean.