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Photo Forum / Digital Photography / DSLR Cameras / January 2005What does 'IF' stand for on Nikon lenses?
What does 'IF' stand for on Nikon lenses? Mine just says ED but I don't see that described elsewhere. >What does 'IF' stand for on Nikon lenses? > >Mine just says ED but I don't see that described elsewhere. Internal Focus. With IF lenses, the front element does not change position while focusing. (The focal length does change, but that's another story).  SignatureMichael Benveniste -- mhb-offer@clearether.com Spam and UCE professionally evaluated for $419. Use this email address only to submit mail for evaluation. >>What does 'IF' stand for on Nikon lenses? >>Mine just says ED but I don't see that described elsewhere. > > Internal Focus. With IF lenses, the front element does not change > position while focusing. (The focal length does change, but that's > another story). Hmm so what difference does this make in the real world? I got a Nikon AF 28-200mm f/3.5-5.6G ED but when I google that all I see is the same thing with IF added. I didn't get a lense hood is the only difference I noticed. The lense does not rotate when I focus, did they just forget to print IF on it? > Hmm so what difference does this make in the real world? Non-rotating front elements make it much easier to use such filters as polarizers and rectangular split NDs. > >>What does 'IF' stand for on Nikon lenses? > >>Mine just says ED but I don't see that described elsewhere. [quoted text clipped - 8 lines] > only difference I noticed. The lense does not rotate when I focus, did > they just forget to print IF on it? The non rotating while focussing is a complete red herring. It is solely about whether the lens assembly changes length. B > The non rotating while focussing is a complete red herring. It is > solely about whether the lens assembly changes length. It does not change length when focusing, only when zooming. > The non rotating while focussing is a complete red herring. It is > solely about whether the lens assembly changes length. If you use pol-filters or 'Cokin' filter holders, a non rotating front element is a blessing, neigh, a neccesity. Signature-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. > > The non rotating while focussing is a complete red herring. It is > > solely about whether the lens assembly changes length. > > If you use pol-filters or 'Cokin' filter holders, a non rotating front > element is a blessing, neigh, a neccesity. While this is true, really doesn't have much to do with the IF being discussed. B > >What does 'IF' stand for on Nikon lenses? > > [quoted text clipped - 3 lines] > position while focusing. (The focal length does change, but that's > another story). does that mean that the lens does not have to pump air in and out as it is zoomed and focused? > -- > Michael Benveniste -- mhb-offer@clearether.com > Spam and UCE professionally evaluated for $419. Use this email > address only to submit mail for evaluation. > does that mean that the lens does not have to pump air in and out > as it is zoomed and focused? The lens still has to move air around as it repositions element groups. I would guess that IF lenses pump _less_ air in and out, but I doubt that they are truly isolated from outside air. SignatureMichael Benveniste -- mhb-offer@clearether.com Spam and UCE professionally evaluated for $419. Use this email address only to submit mail for evaluation. > What does 'IF' stand for on Nikon lenses? > > Mine just says ED but I don't see that described elsewhere. IF=Internal Focus, not all lenses are IF. IF lenses barrells don't rotate nor do the lenses get longer as you focus closer. > What does 'IF' stand for on Nikon lenses? "Internal focus for fast AF operation" (first google hit, then clicked on an IF lense http://www.nikonusa.com/template.php?cat=1&grp=5&productNr=1940). /Allan > What does 'IF' stand for on Nikon lenses? It means IF you're lucky you might get a worthwhile picture. |
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