Sac I'm standing by to be corrected.
Sac Mafud
Sac [EMAIL PROTECTED]
Sac [EMAIL PROTECTED]
Mafud, the correction is simple ;)
do you have a variable aperture zoom? try it yourself.
Point a variable aperture zoom toward a evenly lit wall, set
~YOURSELF~ an aperture (e.g. f/8), and see the
-320 set to minimum aperture (f/32 at 80mm), the
viewfinder indicates a change to f/38 as the lens is zoomed to 320mm.
Regards
Jim Brooks
--
Date: Thu, 06 Dec 2001 20:09:05 -0600
From: John Mustarde [EMAIL PROTECTED]
Subject: Re: Variable aperture zoom question
Kent suggested:
Well that is correct except at the widest setting. If you have a 28-80/4-5.6 lens
and set the aperture manually at F4 and zoom from 28 to 80mm you will end up at
F5.6 even if the ring says F4. This is because at the widest setting the aperture
ring is not involved in the
[EMAIL PROTECTED] wrote:
I'll say this and no more: when you ~manually~ set the aperture, the
variable aperture becomes a preset (by you) aperture. Nothing you do
while zooming will (can) change the aperture until (you) change it to a
different setting. **And it does not matter whether you
I believe that when using Pentax cameras that allow
you to set the aperture at the camera body, such as
PZ-1P or ZX-7 and leaving the lens set at A, the
aperture will remain fixed as you zoom the variable
aperture lens.
Send your FREE holiday greetings online!
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-
This
varies.
Kent Gittings
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Michael Nosal
Sent: Wednesday, December 05, 2001 4:25 PM
To: [EMAIL PROTECTED]
Subject: Re: Variable aperture zoom question
At 03:36 PM 12/5/01 EST, Mafud wrote:
In a message dated 12/5/01
]
Sent: Wednesday, December 05, 2001 7:51 PM
To: [EMAIL PROTECTED]
Subject: Re: Variable aperture zoom question
In a message dated 12/5/01 4:19:36 PM Eastern Standard Time,
[EMAIL PROTECTED] writes:
That's precisely the point - that because the zoom lens is variable
aperture, I cannot
_
-Original Message-
Subject: Re: Variable aperture zoom question
In a message dated 12/5/01 4:19:36 PM Eastern Standard Time,
[EMAIL PROTECTED] writes:
That's precisely the point - that because the zoom lens is variable
aperture, I
On Thu, 06 Dec 2001 10:13:26 GMT, you wrote:
[EMAIL PROTECTED] wrote:
I'll say this and no more: when you ~manually~ set the aperture, the
variable aperture becomes a preset (by you) aperture. Nothing you do
while zooming will (can) change the aperture until (you) change it to a
different
At 10:14 AM 12/5/01 +0100, Boz wrote:
Hi,
That's not an easy task. The aperture markings usually correspond to
the widest aperture. So, if you set the focal length to 50 and the
aperture ring to where 8 is marked, you will have f/8 @ 28 and
something like f/13.5 @ 80 mm.
The trouble with the
In a message dated 12/5/01 8:53:28 AM Eastern Standard Time,
[EMAIL PROTECTED] writes:
Subj:Re: Variable aperture zoom question
(Hi,
Fred wrote:
Mike:
Suppose I have a variable aperture zoom lens, say 28-80mm
f3.5-f5.6 If I set the zoom at 28mm, and set the aperture wide
At 03:36 PM 12/5/01 EST, Mafud wrote:
In a message dated 12/5/01 12:03:46 PM Eastern Standard Time,
[EMAIL PROTECTED] writes:
The replies to my original query seem to agree with what I was told - that a
variable aperture zoom lens will vary the amount of light admitted as you
zoom in and
On Wed, 5 Dec 2001 [EMAIL PROTECTED] wrote:
I'll say this and no more: when you ~manually~ set the aperture, the
variable aperture becomes a preset (by you) aperture. Nothing you do
while zooming will (can) change the aperture until (you) change it to a
different setting.
[snip]
**And
I'll say this and no more: when you ~manually~ set the aperture,
the variable aperture becomes a preset (by you) aperture.
Nothing you do while zooming will (can) change the aperture
until (you) change it to a different setting. [snip] And it does
not matter whether you set it wide open or
In a message dated 12/5/01 8:46:30 PM Eastern Standard Time,
[EMAIL PROTECTED] writes:
So I think you're wrong here, but it'spossible that I'm misunderstanding
what you're trying to say.
chris
What I've said is: the physical aperture does not change. What happens in the
viewfinder I'm
Could you help settle a debate?
Suppose I have a variable aperture zoom lens, say 28-80mm f3.5-f5.6
If I set the zoom at 28mm, and set the aperture wide open, it should be
f3.5. If I then zoom to 80mm, the effective aperture goes down to f5.6,
right? And if I zoom to 50mm, the aperture will be
Mike:
Suppose I have a variable aperture zoom lens, say 28-80mm
f3.5-f5.6 If I set the zoom at 28mm, and set the aperture wide
open, it should be f3.5. If I then zoom to 80mm, the effective
aperture goes down to f5.6, right? And if I zoom to 50mm, the
aperture will be somewhere in between,
My F zoom lenses appear to have a second mark (a green dot) on the aperture
(not there on the primes) which would appear to align with the lower of the
two f settings. My guess would be this is the real f stop for the opposite
and of the range...
e.g. an F 70-210 1:4-1:5.6
Main orange f stop
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