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|  » Stats |
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18-04-2010, 10:01 PM
|  | Officer of the Wild Empire | | Join Date: Jul 2008 Location: South Coast, UK, nr Dorchester
Posts: 717
| | | Daft Question
I just know this is a really stupid question but it occured to me last night that if a lens is "IF", internal focussing, with all the moving parts enclosed this means its auto focus only, right?
Told you it's a stupid question.
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18-04-2010, 10:18 PM
|  | Commander of the Wild Empire | | Join Date: Mar 2006 Location: West Lothian
Posts: 2,432
| | | Re: Daft Question
Quote:
Originally Posted by nigel_b  I just know this is a really stupid question but it occured to me last night that if a lens is "IF", internal focussing, with all the moving parts enclosed this means its auto focus only, right?
Told you it's a stupid question. | Hi Nigel, No that is not correct. I have the Sigma EX 100-300mm f4 lens with IF and it can be usual in manual and auto focus mode. This lens therefore retains a constant length throughout it's operation.
John D Zenfolio | John's Wild World |
19-04-2010, 06:19 PM
| | Commander of the Wild Empire | | Join Date: Mar 2006 Location: West Lothian
Posts: 2,432
| | | Re: Daft Question
Quote:
Originally Posted by John D Hi Nigel, No that is not correct. I have the Sigma EX 100-300mm f4 lens with IF and it can be usual in manual and auto focus mode. This lens therefore retains a constant length throughout it's operation.
John D Zenfolio | John's Wild World | CORRECTION TO ABOVE- read USED instead of 'usual'.
John D Zenfolio | John's Wild World |
19-04-2010, 08:29 PM
| | Commander of the Wild Empire | | Join Date: Jan 2008 Location: S. Devon
Posts: 3,900
| | | Re: Daft Question
And the bonus is that they don't suck in dust like the variable length zooms.
I use my Sigma 180 macro mostly with manual focus. |
19-04-2010, 10:10 PM
| | Officer of the Wild Empire | | Join Date: Jul 2008 Location: South Coast, UK, nr Dorchester
Posts: 717
| | | Re: Daft Question
Thanks for the replies. Didnt want to make a costly mistake.
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