p.1 #1 · Lens Caliberation (Body Caliberation as well?)
Many a times i have read about people needing to have their lenses caliberated for various softness issues, here on this board. Usually, as i understand, lenses which tend to front or back focus stand to benefit the maximum from caliberation.
I have also read, some contradicting views about caliberations - some people suggest that the only the lens in question needs caliberation, yet others suggest that its a good idea to send in your camera as well, so the lens may be caliberated to work the best on that particular body.
Going by the idea that both the lens and the body should be sent in, is the body caliberated in any way ? If yes, then what happens to those lenses which were focusing well on the same body earlier ? would they be affected by the caliberated body ?
Is there any harm in taking all the lenses and the camera body for the tweaking, without there being any apparent need (situation where the pictures arent out of focus, but dont jump out even with the L lenses ? Any cons ?
Could someone shed more light on these issues?
TIA
Edited by starlights on Dec 31, 2005 at 11:55 AM GMT
p.1 #3 · Lens Caliberation (Body Caliberation as well?)
Sometimes it's the lense, sometimes it's the body.
I had a 1DS that backfocused with all my lenses.
Sent it in, Canon calibrated it and it was perfect.
Sometimes a lens is confused and it need calibration.
Dec 31, 2005 at 12:09 PM
Sunrise Bobby Offline • • [X]
p.1 #4 · Lens Caliberation (Body Caliberation as well?)
calibration calibration calibration
But .................. what the hell are they calibrating
p.1 #5 · Lens Caliberation (Body Caliberation as well?)
Lens and body calibration are equally important. Calibration is adjustments to firmware lookup tables containing things like the correct position of the focus ring to focus at 13 feet. This will vary slightly from lens to lens, so the data is stored in tables in the lens firmware. The body calibration deals with the magnitude of the focus error signal from the AF sensor, and how much of a lens adjustment is required to achieve correct focus. If either body or lens calibration is incorrect, focus errors will result.
Dec 31, 2005 at 02:17 PM
Sunrise Bobby Offline • • [X]
p.1 #6 · Lens Caliberation (Body Caliberation as well?)
jonwienke wrote:
Lens and body calibration are equally important. Calibration is adjustments to firmware lookup tables containing things like the correct position of the focus ring to focus at 13 feet. This will vary slightly from lens to lens, so the data is stored in tables in the lens firmware. The body calibration deals with the magnitude of the focus error signal from the AF sensor, and how much of a lens adjustment is required to achieve correct focus. If either body or lens calibration is incorrect, focus errors will result.
p.1 #8 · Lens Caliberation (Body Caliberation as well?)
Hmm ...thanks guys for your replies so far
I have this new 5D,on which my 85 1.8 focuses so beautifully that the images tend to pop out, the 50 macro and the 20-35 focus fine too, but i am on the second 135 f2 and this one doesnt seem to focus exactly where intended. On the paper scale test, it showed a bit of backfocus (3-4mm) at the nearest focusing distance at an angle of 45 degrees, but in the field, somehow, its frustrating, because the eyes are never tack sharp (even if center focused on eyes at high shutter speeds)- and i am not getting the wow factor out of it - its an internet purchase from amazon, so i couldnt test and choose a copy (though after one replacement, amazon refunded me $150 on a suggestion that rather than exchanging another time, i have it caliberated)
The Jersey Canon service center is on my route to work, so i am planning to take it in for caliberation, after i receive the 17-40 from amazon as well which is currently on order (incase that has issues too). Hence the dilemma. Should i just walk in with all my lenses and the body ?
