Optical equivalent of lens

On Mon, 27 Aug 2007 12:05:38 -0700, Denis wrote:

> What optical zoom does this equate to
>
> with AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6G ED II

So, divide 55 by 18. The answer is: 3.0555555555555555x
 >> Stay informed about: Optical equivalent of lens 

Denis wrote:
> What optical zoom does this equate to
> with AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6G ED II

Well, 18-55mm. What is your real question?

jue
 >> Stay informed about: Optical equivalent of lens 

Denis wrote:
> ...
> Like 4x optical zoom that you'd see written on a compact camera spec
> ...

"4x optical zoom" refers to the ratio between the longest and the shortest focal
length of the lens. For a 18-55 lens that would be 55/18 = 3.05. So, it's almost
exactly 3x zoom.

There's a common misconception that "4x optical zoom" somehow refers to the
observed magnification the lens produce in the viewfinder (like, say, "4x
magnification" on binoculars), while in reality it has absolutely nothing to do
with it.

--
Best regards,
Andrey
 >> Stay informed about: Optical equivalent of lens 

On Mon, 27 Aug 2007 12:29:34 -0700, Denis wrote:

>>> What optical zoom does this equate to
>>> with AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6G ED II
>>
>> Well, 18-55mm. What is your real question?
>
> Like 4x optical zoom that you'd see written on a compact camera spec

It has a 3.055556x nominal zoom range, depending on your
calculator's precision. Individual samples probably range from
3.05x to 3.06x, or not. The zoom range is just the result of
dividing the lens's largest focal length by the shortest, so for
Nikon's 18-200mm VR lens, the zoom range is 11.11x.
 >> Stay informed about: Optical equivalent of lens 

This message is not archived
 >> Stay informed about: Optical equivalent of lens 

ray wrote:
> On Mon, 27 Aug 2007 12:05:38 -0700, Denis wrote:
>
>> What optical zoom does this equate to
>>
>> with AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6G ED II
>
> So, divide 55 by 18. The answer is: 3.0555555555555555x

I thought he was asking 35mm equivalent. For the sensor size on most
dslr's, there is an adjustment factor of 1.5x.
Dave Cohen
 >> Stay informed about: Optical equivalent of lens 

You don't know to divide 55 by 18?
Jim
"Denis" <denisphelan.RemoveThis@gmail.com> wrote in message
news:1188242974.797860.64380@y42g2000hsy.googlegroups.com...
On Aug 27, 8:18 pm, "Jürgen Exner" <jurge....RemoveThis@hotmail.com> wrote:
> Denis wrote:
> > What optical zoom does this equate to
> > with AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6G ED II
>
> Well, 18-55mm. What is your real question?
>
> jue

Like 4x optical zoom that you'd see written on a compact camera spec
 >> Stay informed about: Optical equivalent of lens 

Denis wrote:
> On Aug 27, 8:18 pm, "Jürgen Exner" <jurge....DeleteThis@hotmail.com> wrote:
>> Denis wrote:
>>> What optical zoom does this equate to
>>> with AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6G ED II
>>
>> Well, 18-55mm. What is your real question?
>>
>> jue
>
> Like 4x optical zoom that you'd see written on a compact camera spec

55/18 = 3.06
So it's a 3x zoom.

jue
 >> Stay informed about: Optical equivalent of lens 

On Mon, 27 Aug 2007 21:42:55 +0000, Dave Cohen wrote:

> ray wrote:
>> On Mon, 27 Aug 2007 12:05:38 -0700, Denis wrote:
>>
>>> What optical zoom does this equate to
>>>
>>> with AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6G ED II
>>
>> So, divide 55 by 18. The answer is: 3.0555555555555555x
>
> I thought he was asking 35mm equivalent. For the sensor size on most
> dslr's, there is an adjustment factor of 1.5x.
> Dave Cohen

I would assume, though I certainly could be wrong, that the quoted 18-55
is probably the 35mm equivalent. At any rate, the question was slightly
ambiguous or at least unclear.
 >> Stay informed about: Optical equivalent of lens 

On Mon, 27 Aug 2007 21:08:51 -0600, ray wrote:

> On Mon, 27 Aug 2007 21:42:55 +0000, Dave Cohen wrote:
>
>> ray wrote:
>>> On Mon, 27 Aug 2007 12:05:38 -0700, Denis wrote:
>>>
>>>> What optical zoom does this equate to
>>>>
>>>> with AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6G ED II
>>>
>>> So, divide 55 by 18. The answer is: 3.0555555555555555x
>>
>> I thought he was asking 35mm equivalent. For the sensor size on most
>> dslr's, there is an adjustment factor of 1.5x. Dave Cohen
>
> I would assume, though I certainly could be wrong, that the quoted 18-55
> is probably the 35mm equivalent. At any rate, the question was slightly
> ambiguous or at least unclear.

>>>>>>>>>>>>>>>>>>>>>

I'm probably wrong but an 18mm-55mm lens on a 35mm camera without a (1.6x)
DSLR factor would be more like -3/4X (wide angle 18mm) to (just about 1:1
50mm is 1X). On a DSLR with a 1.6X factor you would have the equivalent
of (28.8mm -1/2X power wide angle ) to (88.00 mm or a little over 1.75X
power).

Rich
 >> Stay informed about: Optical equivalent of lens