Focus ring

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naveen.nag

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Naveen
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I got my brand new canon 10-22 lens yesterday and already loving it.

However had a query to ask regarding the focus ring. While trying out the lens, i unknowingly twiated the focus ring couple of time when thenlens was in AUTO FOCUS mode. Did i do something wrong, would it have any negative impact on the lens? Ia m little concerned over this.

Pls throw some light.
 
No it's fine, it has full time manual override, so you can manually focus even in AF.
 
Hello

I wouldn't keep twist that lens in AF mode why don't you use MF on the lens?
 
TCR4x4 said:
No it's fine, it has full time manual override, so you can manually focus even in AF.
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Thanks Tom. I dint know that. Thats a relief.

Just curious, so what about other lenses? Wjat happens when we twist the focus ring in AF mode? Does it spoil or damage the lens?
 
A lot of lens theses days,if set on auto focus,will allow your to to grab the focus ring and manual focus,you may have to be a bit more careful with some older lens :)
 
naveen.nag said:
Thanks Tom. I dint know that. Thats a relief.

Just curious, so what about other lenses? Wjat happens when we twist the focus ring in AF mode? Does it spoil or damage the lens?
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Possible but unlikely. You'll feel resistance and it will just turn the gears. Im pretty sure on canon it's impossible to do that, as the motors are all in the lens and not the body but I'll stand corrected if anyone knows different.
 
I could be mistaken, but my understanding was that the ease of full-time manual operation is primarily due to such lenses using ultrasonic motors (AF-S, HSM, USM, etc), where the nature of the motor permits for effectively an automatic clutch release - if the motor senses you're trying to move the lens, it can simply disengage.

The Wikipedia entry on ultrasonic motors is worth a peek, in any event. Such a nifty concept!
 
TCR4x4 said:
Possible but unlikely. You'll feel resistance and it will just turn the gears. Im pretty sure on canon it's impossible to do that, as the motors are all in the lens and not the body but I'll stand corrected if anyone knows different.
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AFAIK, you're right, Tom. It would be a slightly different matter on a Nikon with a screw driven lens on a screw driver body but you feel so much resistance then that you know something ain't quite right!

Again AFAIK (not a Canon user so I'm not 100% certain) if the camera/lens are in AF mode, manually overriding the AF jus gets overriden itself when the ring is released.
 
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Nod said:
Again AFAIK (not a Canon user so I'm not 100% certain) if the camera/lens are in AF mode, manually overriding the AF jus gets overriden itself when the ring is released.
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Depends on the lens. The 50mm f/1.8 and any other lens without FTM (Full Time Manual override) will break the AF clutch eventually if you keep doing it.
 
Thanks for that correction. Now I know so can pass that on if the same question pops up.:)
 
one thing i don't like with Canon and Sigma's manual AF override (not sure about Tamron or Tokina) is that you can't stop it from AF before it locks by twisting the lens.

with Nikon's M/A mode, you can twist the lens while engaging AF, the AF will stop immanently and let you manual focus.
 
wuyanxu said:
one thing i don't like with Canon and Sigma's manual AF override (not sure about Tamron or Tokina) is that you can't stop it from AF before it locks by twisting the lens.

with Nikon's M/A mode, you can twist the lens while engaging AF, the AF will stop immanently and let you manual focus.
Click to expand...

If you use BBF, this is hardly an issue - one of the reasons I hafe AF on the shutter button. With BBF you can always choose when and on what you're focussing on with no chance that the camera will decide to fight you about it.

BBF = Back Button Focus (for those that need clarification)
 
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