I'm hoping for a quick answer.
When you calibrate a 50D using a LenAlign at what distance do you set between the LensAlign and a EF-S 10-22mm and a 70-200mm ?
I’d really like the distance in feet.
1Dx MKII | 1Dx | 5D MKIV | 5D MKIII | 5Ds r | 5Ds | 7D MKII | 7D | G16 | G3x | EOS M & M3 | 800 f5.6 | 600 f4 | 400 f2.8 | 300 f2.8 | 200-400 f4 | 100-400 f4.5 - 5.6 II x 2 | 70-200 f2.8 | 14 f2.8 II | 50 f1.2 | 50 1.4 | 85 f1.2 | 135 f2 | 24-70 f2.8 II | 11-24 f4 | 35 f1.4 II | Pentax 645Z | SMC Pentax-DA 645 25mm F4 AL | SMC Pentax-D FA 645 55mm F2.8 AL | Pentax 90mm f/2.8 D FA 645 Macro ED AW SR | SMC Pentax-D FA 645 200mm f/4 IF | SMC Pentax-D FA 645 300mm f/4 ED IF | SMC FA 645 400mm f/5.6 ED IF Lens
Cream of the Crop
Joined Mar 2005
Location: Portage, Wisconsin USA
And LenAlign is ?
Joined Mar 2009
Location: CA, Bay Area
I don't have one gasrocks, but you can see what they are here: http://www.rawworkflow.com/lensalign
Joined May 2005
Location: Lonestar State
Canon recommends 50x the focal length of the the lens being tested. When calibrating a zoom, you need to decide what focal length you are calibrating against. If you want to calibrate at the 10mm end, the LensAlign target needs to be 500mm away (or 19.58 inches). If you want to calibrate it at the 22mm end, then the target needs to be 1100mm (or 43.3 inches away).
David (aka BigBlueDodge)
"After 40 years still not housebroken, I still piddle on the carpet"
Joined May 2007
Location: SF Bay Area
Bear in mind that the recommended distances are from the sensor, not the front of the lens.
"Be seeing you."
Joined Jul 2006
May 21, 2009 16:24 as a reply to @ number six's post |
If you need the numbers again, pick the longest focal length of the zoom and open to the widest aperture. The whole point is to get a DOF thin enough for you to be able to distinguish the OOF regions. Then enter into google search
Joined Mar 2009
Location: Fremont, CA
May 21, 2009 16:28 as a reply to @ joove's post |
This chart was posted on the lens align forum:
Note that Michael from lens align suggests that 25x focal length is fine as well.