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I have just bought a 70-300mm f4-5.6 SP Di VC USD Lens and am confused over using manual focusing override when in automatic mode. The instructions say you can make fine tuning in automatic mode BUT then say interfering with the focusing ring may cause serious damage when in AF mode. I am a bit lost can someone advise me what you can safely do with the focusing with the lenses?
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I have that lens and it's perfectly safe to use the full time manual focusing facility.Only problem is that if you use the shutter button to focus then fine tune manually it will override your fine tuning. Solution ? use BBF ( back button focus ).
Here's a link for BBF with Canon Cameras.
Thanks for that
One thing I wonder is with the auto focus working with my 100m macro I can keep the exposure button 1/2 depressed and change the focus with no problem Are you also able to do this with the 70-300?
Being a wonderfully satisfied Tamron user for many years and a great fan of their cost affordable and high performance products. The answer to your question is a 'YES' this is so with the entire range, although I would not recommend it that often as you to get a slight clunking sound in the gear mechanisms which because of their lightweight build do tend to wear quiet significantly over a period of prolonged use or abuse...
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