What does 'IF' stand for on Nikon lenses?

[Paul]

Archived from groups: rec.photo.digital.slr-systems (More info?)

What does 'IF' stand for on Nikon lenses?

Mine just says ED but I don't see that described elsewhere.

 

[Darrell]

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"paul" <paul@not.net> wrote in message
news:eOCdnUeausNu9kXcRVn-2g@speakeasy.net...
> 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.

 

[Guest]

Archived from groups: rec.photo.digital.slr-systems (More info?)

On Sun, 02 Jan 2005 13:47:30 -0800, paul <paul@not.net> wrote:

>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).

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[Paul]

Archived from groups: rec.photo.digital.slr-systems (More info?)

Michael Benveniste wrote:

> On Sun, 02 Jan 2005 13:47:30 -0800, paul <paul@not.net> wrote:
>
>>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?

 

[Guest]

Archived from groups: rec.photo.digital.slr-systems (More info?)

paul wrote:

> 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.

 

[Guest]

Archived from groups: rec.photo.digital.slr-systems (More info?)

On 2005-01-02, paul <paul@not.net> wrote:
> 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

 

[Guest]

Archived from groups: rec.photo.digital.slr-systems (More info?)

paul <paul@not.net> writes:

> Michael Benveniste wrote:
>
> > On Sun, 02 Jan 2005 13:47:30 -0800, paul <paul@not.net> wrote:
> >
> >>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?

The non rotating while focussing is a complete red herring. It is
solely about whether the lens assembly changes length.

B>

 

[Paul]

Archived from groups: rec.photo.digital.slr-systems (More info?)

Bruce Murphy wrote:

> paul <paul@not.net> writes:
>
> 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.

 

[Guest]

Archived from groups: rec.photo.digital.slr-systems (More info?)

Bruce Murphy wrote:

> 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.

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[Guest]

Archived from groups: rec.photo.digital.slr-systems (More info?)

Michael Benveniste wrote:
>
> On Sun, 02 Jan 2005 13:47:30 -0800, paul <paul@not.net> wrote:
>
> >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).

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.

 

[Guest]

Archived from groups: rec.photo.digital.slr-systems (More info?)

Alan Browne <alan.browne@freelunchVideotron.ca> writes:

> Bruce Murphy wrote:
>
> > 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>

 

[Guest]

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"paul" <paul@not.net> wrote in message
news:eOCdnUeausNu9kXcRVn-2g@speakeasy.net...
> What does 'IF' stand for on Nikon lenses?
>

It means IF you're lucky you might get a worthwhile picture.

 

[Guest]

Archived from groups: rec.photo.digital.slr-systems (More info?)

"Crownfield" <Crownfield@cox.net> wrote in message
news:41DA0CD0.71D9@cox.net...

> 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.

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Michael Benveniste -- mhb-offer@clearether.com
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