Canon 70-200 f4 whats the 1.2m and 3m switch for

To limit the focus travel to those distances.
If you know your subject isnt going to be futher that 1.2m, then you can set it so the lens will only focus that far, thus speeding up the focus, the same for 3m.
 
minimum focus distance.

If you are more than 3m away use that one as it will focus quicker.
 
Ok, amusing (and beneficial for me) story about this.

A while back someone put a 70-200mm f4 IS on Ebay for £450 BIN or best offer. The seller had sold the lens previously but it had been returned by the buyer as not working and so was refunded. Unfortunately the seller had sold all his Canon gear and so couldn't test the lend and so put it on Ebay as faulty.The fault was that it would not focus when pointing down but was fine on objects further away.

Anyway .. taking a total gamble I offered £350 and it was accepted, lens arrived in perfect condition but it wouldn't focus on anything close.




Until I flicked over the focus limiter switch :bonk:
 
{ it would not focus when pointing down but was fine on objects further away.}

Embarrassed to say it catches me out now and again.
 
Mike.P said:
Ok, amusing (and beneficial for me) story about this.

A while back someone put a 70-200mm f4 IS on Ebay for £450 BIN or best offer. The seller had sold the lens previously but it had been returned by the buyer as not working and so was refunded. Unfortunately the seller had sold all his Canon gear and so couldn't test the lend and so put it on Ebay as faulty.The fault was that it would not focus when pointing down but was fine on objects further away.

Anyway .. taking a total gamble I offered £350 and it was accepted, lens arrived in perfect condition but it wouldn't focus on anything close.




Until I flicked over the focus limiter switch :bonk:
Click to expand...


Bargin, you must be one happy chappy
 
Hazza said:
I find it doesn't make a whole lot of difference in honesty... Can't say there is any noticeable difference in speed, or accuracy. Just always quick and efficient.
Click to expand...

I've found it makes the most difference in poor light conditions where the camera might rack the focus from MFD to infinity. In these more extreme situations the difference is significant.

Phil
 
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