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From: Paul Furman on 5 May 2008 14:25
Hal Murray wrote:
>> Nikon lenses designated AF-S and AF-I have an autofocus motor in the
>> lens. AF-I is an older design. Sigma lenses designated HSM have an
>> autofocus motor. I don't know of any other third party lenses with
>> autofocus motors, but there may be some out there now.
>
> What are the advantages and/or disadvantages of putting the
> motor in the lense?

Quieter, faster, and you can make the body smaller & cheaper without a
motor & screw drive mechanism.

--
Paul Furman
www.edgehill.net
www.baynatives.com

all google groups messages filtered due to spam
From: nospam on 5 May 2008 14:29
In article <ziITj.13881$V14.7369(a)nlpi070.nbdc.sbc.com>, Paul Furman
<paul-@-edgehill.net> wrote:

> > What are the advantages and/or disadvantages of putting the
> > motor in the lense?
>
> Quieter, faster, and you can make the body smaller & cheaper without a
> motor & screw drive mechanism.

on the other hand, one motor in the camera and just gears in the lens
can be less expensive. it's all tradeoffs.
From: "PDM" pdcm99minus this on 5 May 2008 16:32

"Paul Furman" <paul-@-edgehill.net> wrote in message
news:ziITj.13881$V14.7369(a)nlpi070.nbdc.sbc.com...
> Hal Murray wrote:
>>> Nikon lenses designated AF-S and AF-I have an autofocus motor in the
>>> lens. AF-I is an older design. Sigma lenses designated HSM have an
>>> autofocus motor. I don't know of any other third party lenses with
>>> autofocus motors, but there may be some out there now.
>>
>> What are the advantages and/or disadvantages of putting the
>> motor in the lense?
>
> Quieter, faster, and you can make the body smaller & cheaper without a
> motor & screw drive mechanism.

Downside: bigger and heavier.

PDM


From: "PDM" pdcm99minus this on 6 May 2008 17:10

"Tzortzakakis Dimitrios" <noone(a)nospam.void> wrote in message
news:fvpvqg$qlt$1(a)mouse.otenet.gr...
>
> ? "Mark Sieving" <mark_sieving(a)yahoo.com> ?????? ??? ??????
> news:e073ff36-1752-4eb8-85e8-9007e753a166(a)56g2000hsm.googlegroups.com...
> On May 6, 1:40 am, "David J Taylor" <david-tay...(a)blueyonder.neither-
> this-bit.nor-this-bit.co.uk> wrote:
>> PDM wrote:
>>
>> > Downside: bigger and heavier.
>>
>> Here are a couple of examples from the Nikon range:
>>
>> Nikon 18-55mm 205g, 70 x 74mm
>>
>> Nikon 55-200mm - 255g, 68 x 79mm
>>
>> These are not big or heavy lenses, even if there are some extra grams of
>> focus motor in there....
>
> It's hard to find direct comparisons between AF-S and AF lenses, but
> for what it's worth, the AF-S 60mm f/2.8G ED is a little bit lighter
> than the AF version, though longer:
>
> AF Micro- NIKKOR 60mm f/2.8D - 440g, 70x74.5mm
> AF-S Micro- NIKKOR 60mm f/2.8G ED - 425g, 73x89mm
>
> Despite the apparent similarity, these lenses are different optical
> designs, so they may not be strictly comparable. But it does seem
> that putting an autofocus motor in the lens doesn't necessarily make
> for a significantly larger and heavier lens.
> <end quote>
> Yes-with today's technology, which makes many things possible. Even the
> best science fiction author couldn't predict the internet, mobile phones,
> optical drives and everything we have today....

My 105 VR SWM lens is 729 grams. The discontinued non SWM version is 435
grams.

The 70-200 SWM zoom is 1470 grams; a similar discontinued lens 70-210 is 375
grams.

Although I agree it is difficult to compare older lenses with modern ones
the SWM motor and VR adds size and weight.

PDM


From: David J Taylor on 6 May 2008 02:40
PDM wrote:
> "Paul Furman" <paul-@-edgehill.net> wrote in message
> news:ziITj.13881$V14.7369(a)nlpi070.nbdc.sbc.com...
>> Hal Murray wrote:
>>>> Nikon lenses designated AF-S and AF-I have an autofocus motor in
>>>> the lens. AF-I is an older design. Sigma lenses designated HSM
>>>> have an autofocus motor. I don't know of any other third party
>>>> lenses with autofocus motors, but there may be some out there now.
>>>
>>> What are the advantages and/or disadvantages of putting the
>>> motor in the lense?
>>
>> Quieter, faster, and you can make the body smaller & cheaper without
>> a motor & screw drive mechanism.
>
> Downside: bigger and heavier.
>
> PDM

Here are a couple of examples from the Nikon range:

Nikon 18-55mm 205g, 70 x 74mm

Nikon 55-200mm - 255g, 68 x 79mm

These are not big or heavy lenses, even if there are some extra grams of
focus motor in there....

David


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