Correct me if I am wrong. F/stop usually refers to how fast the lens
is, or how abundant the camera can get the light behind the lens. I
recall some of the old Canon lenses can have an F/stop to close or
below 1 on their fixed lenses ( F/0.95 or F/1.1 in 50mm lenses). Zoom
lenses are typically slower (started with F/stop around 2.8 or 3.5).
How does this applied to the P&S digital cameras? I realize that all
or most of the digital cameras nowadays has a zoom lens, instead of a
fixed lens. Two questions:
1. Could anyone tell me, which digital camera has the fastest zoom
lens?
2. Do they manufacture P&S digital camera with a fixed lens nowadays?
I always see that it has at least 3x optical zoom. I am referring to
the estinguished camera brand names (Canon, Nikon, Pentax, Olympus,
Fuji, Lumix, Kodak,etc) , not those cheap 1MP cameras.
Thanks for info.
<aniramca@gmail.com> wrote in message
news:1178986889.395152.211190@e51g2000hsg.googlegr oups.com...
> Correct me if I am wrong. F/stop usually refers to how fast the lens
> is, or how abundant the camera can get the light behind the lens. I
> recall some of the old Canon lenses can have an F/stop to close or
> below 1 on their fixed lenses ( F/0.95 or F/1.1 in 50mm lenses). Zoom
> lenses are typically slower (started with F/stop around 2.8 or 3.5).
>
> How does this applied to the P&S digital cameras? I realize that all
> or most of the digital cameras nowadays has a zoom lens, instead of a
> fixed lens. Two questions:
> 1. Could anyone tell me, which digital camera has the fastest zoom
> lens?
> 2. Do they manufacture P&S digital camera with a fixed lens nowadays?
Don't think so. They would not sell.
> I always see that it has at least 3x optical zoom. I am referring to
> the estinguished camera brand names (Canon, Nikon, Pentax, Olympus,
> Fuji, Lumix, Kodak,etc) , not those cheap 1MP cameras.
> Thanks for info.
>
Repeat after me: An fstop is an fstop regardless of what kind of camera
hooks to the lens.
"Jim" <j.n@nospam.com> wrote in message
newsao1i.2806$zj3.2265@newssvr23.news.prodigy.ne t...
>
> <aniramca@gmail.com> wrote in message
> news:1178986889.395152.211190@e51g2000hsg.googlegr oups.com...
> > Correct me if I am wrong. F/stop usually refers to how fast the
lens
> > is, or how abundant the camera can get the light behind the lens.
I
> > recall some of the old Canon lenses can have an F/stop to close or
> > below 1 on their fixed lenses ( F/0.95 or F/1.1 in 50mm lenses).
Zoom
> > lenses are typically slower (started with F/stop around 2.8 or
3.5).
> >
> > How does this applied to the P&S digital cameras? I realize that
all
> > or most of the digital cameras nowadays has a zoom lens, instead
of a
> > fixed lens. Two questions:
> > 1. Could anyone tell me, which digital camera has the fastest zoom
> > lens?
> > 2. Do they manufacture P&S digital camera with a fixed lens
nowadays?
> Don't think so. They would not sell.
> > I always see that it has at least 3x optical zoom. I am referring
to
> > the estinguished camera brand names (Canon, Nikon, Pentax,
Olympus,
> > Fuji, Lumix, Kodak,etc) , not those cheap 1MP cameras.
> > Thanks for info.
> >
> Repeat after me: An fstop is an fstop regardless of what kind of
camera
> hooks to the lens.
>
> Jim
>
>
>
The f-stop is the ratio of the area of the iris aperture to the focal
length of the lens. As area is a square formula then halving the light
will require half of the area and thus a change in the stop of root 2.
Hence why lens stops go 2-2.8-4-5.6-8-11-16-22 - each step is a factor
of 1.4 or root 2.
harrogate3 wrote:
> "Jim" <j.n@nospam.com> wrote in message
> newsao1i.2806$zj3.2265@newssvr23.news.prodigy.ne t...
>> <aniramca@gmail.com> wrote in message
>> news:1178986889.395152.211190@e51g2000hsg.googlegr oups.com...
>>> Correct me if I am wrong. F/stop usually refers to how fast the
> lens
>>> is, or how abundant the camera can get the light behind the lens.
> I
>>> recall some of the old Canon lenses can have an F/stop to close or
>>> below 1 on their fixed lenses ( F/0.95 or F/1.1 in 50mm lenses).
> Zoom
>>> lenses are typically slower (started with F/stop around 2.8 or
> 3.5).
>>> How does this applied to the P&S digital cameras? I realize that
> all
>>> or most of the digital cameras nowadays has a zoom lens, instead
> of a
>>> fixed lens. Two questions:
>>> 1. Could anyone tell me, which digital camera has the fastest zoom
>>> lens?
>>> 2. Do they manufacture P&S digital camera with a fixed lens
> nowadays?
>> Don't think so. They would not sell.
>>> I always see that it has at least 3x optical zoom. I am referring
> to
>>> the estinguished camera brand names (Canon, Nikon, Pentax,
> Olympus,
>>> Fuji, Lumix, Kodak,etc) , not those cheap 1MP cameras.
>>> Thanks for info.
>>>
>> Repeat after me: An fstop is an fstop regardless of what kind of
> camera
>> hooks to the lens.
>>
>> Jim
>>
>>
>>
>
> The f-stop is the ratio of the area of the iris aperture to the focal
> length of the lens. As area is a square formula then halving the light
> will require half of the area and thus a change in the stop of root 2.
> Hence why lens stops go 2-2.8-4-5.6-8-11-16-22 - each step is a factor
> of 1.4 or root 2.
>
>
No. It is the ratio of the _diameter_ of the lens opening to the
distance between the center of focus and the film/sensor plane. Thus a
lens with an opening of 25 mm and a focal length of 100 mm is 1/4, or
f/4, when the lens is focused on an object at "infinity". The distance
between the center of focus and the film plane increases as the lens is
focused on closer items; when the image is exactly the same size as the
object, the distance is twice the expressed focal length, so the lens
becomes in effect an f/8 lens and four times the exposure, or two stops,
is required. All this applies strictly single-element lenses; when the
number of elements is increased, especially in the case of zoom lenses,
simple external measurements don't apply.
Allen
aniramca@gmail.com observed
>Correct me if I am wrong. F/stop usually refers to how fast the lens
>is, or how abundant the camera can get the light behind the lens. I
>recall some of the old Canon lenses can have an F/stop to close or
>below 1 on their fixed lenses ( F/0.95 or F/1.1 in 50mm lenses). Zoom
>lenses are typically slower (started with F/stop around 2.8 or 3.5).
>
>How does this applied to the P&S digital cameras? I realize that all
>or most of the digital cameras nowadays has a zoom lens, instead of a
>fixed lens. Two questions:
>1. Could anyone tell me, which digital camera has the fastest zoom
>lens?
>2. Do they manufacture P&S digital camera with a fixed lens nowadays?
>I always see that it has at least 3x optical zoom. I am referring to
>the estinguished camera brand names (Canon, Nikon, Pentax, Olympus,
>Fuji, Lumix, Kodak,etc) , not those cheap 1MP cameras.
>Thanks for info.
>
[The reply-to address is valid for 30 days from this posting]
--
Michael J Davis
<><
Some newsgroup contributors appear to have confused
the meaning of "discussion" with "digression".
<><
"Michael J Davis" <?.?@trustsof.demon.co.uk> wrote in message
news:fsu+kKFjYiRGFwKH@trustsof.demon.co.uk.invalid ...
> aniramca@gmail.com observed
>>Correct me if I am wrong. F/stop usually refers to how fast the lens
>>is, or how abundant the camera can get the light behind the lens. I
>>recall some of the old Canon lenses can have an F/stop to close or
>>below 1 on their fixed lenses ( F/0.95 or F/1.1 in 50mm lenses). Zoom
>>lenses are typically slower (started with F/stop around 2.8 or 3.5).
>>
>>How does this applied to the P&S digital cameras? I realize that all
>>or most of the digital cameras nowadays has a zoom lens, instead of a
>>fixed lens. Two questions:
>>1. Could anyone tell me, which digital camera has the fastest zoom
>>lens?
>>2. Do they manufacture P&S digital camera with a fixed lens nowadays?
>>I always see that it has at least 3x optical zoom. I am referring to
>>the estinguished camera brand names (Canon, Nikon, Pentax, Olympus,
>>Fuji, Lumix, Kodak,etc) , not those cheap 1MP cameras.
>>Thanks for info.
>>
>
> 1. If you mean non interchangeable lenses, then I recall an F2.0 Leica
> Digilux 2
> http://www.dpreview.com/reviews/leicadigilux2/
> or an f2.4 zoom on the Sony DSC-R1
> http://www.dpreview.com/reviews/spec...sony_dscr1.asp
>
> 2. Don't know.
>
> Mike
>
> [The reply-to address is valid for 30 days from this posting]
> --
> Michael J Davis
> <><
> Some newsgroup contributors appear to have confused
> the meaning of "discussion" with "digression".
The 3x zoom on the early G series canon and Casio 3 to 4000 was F2
"Trev" <trevbowdenAT.dsl.pipex.COM> wrote in message
news:TYSdnaOZRoxfsdvbnZ2dnUVZ8vWdnZ2d@pipex.net...
>
> "Michael J Davis" <?.?@trustsof.demon.co.uk> wrote in message
> news:fsu+kKFjYiRGFwKH@trustsof.demon.co.uk.invalid ...
>> aniramca@gmail.com observed
>>>Correct me if I am wrong. F/stop usually refers to how fast the lens
>>>is, or how abundant the camera can get the light behind the lens. I
>>>recall some of the old Canon lenses can have an F/stop to close or
>>>below 1 on their fixed lenses ( F/0.95 or F/1.1 in 50mm lenses). Zoom
>>>lenses are typically slower (started with F/stop around 2.8 or 3.5).
>>>
>>>How does this applied to the P&S digital cameras? I realize that all
>>>or most of the digital cameras nowadays has a zoom lens, instead of a
>>>fixed lens. Two questions:
>>>1. Could anyone tell me, which digital camera has the fastest zoom
>>>lens?
>>>2. Do they manufacture P&S digital camera with a fixed lens nowadays?
>>>I always see that it has at least 3x optical zoom. I am referring to
>>>the estinguished camera brand names (Canon, Nikon, Pentax, Olympus,
>>>Fuji, Lumix, Kodak,etc) , not those cheap 1MP cameras.
>>>Thanks for info.
>>>
>>
>> 1. If you mean non interchangeable lenses, then I recall an F2.0 Leica
>> Digilux 2
>> http://www.dpreview.com/reviews/leicadigilux2/
>> or an f2.4 zoom on the Sony DSC-R1
>> http://www.dpreview.com/reviews/spec...sony_dscr1.asp
>>
>> 2. Don't know.
>>
>> Mike
>>
>> [The reply-to address is valid for 30 days from this posting]
>> --
>> Michael J Davis
>> <><
>> Some newsgroup contributors appear to have confused
>> the meaning of "discussion" with "digression".
>
>
> The 3x zoom on the early G series canon and Casio 3 to 4000 was F2
>
That was an excellent f2.0 lens on the Casio 3000EX.
On Sat, 12 May 2007 17:21:29 +0100, aniramca wrote:
> Correct me if I am wrong. F/stop usually refers to how fast the lens is,
> or how abundant the camera can get the light behind the lens. I recall
> some of the old Canon lenses can have an F/stop to close or below 1 on
> their fixed lenses ( F/0.95 or F/1.1 in 50mm lenses). Zoom lenses are
> typically slower (started with F/stop around 2.8 or 3.5).
>
> How does this applied to the P&S digital cameras? I realize that all or
> most of the digital cameras nowadays has a zoom lens, instead of a fixed
> lens. Two questions:
> 1. Could anyone tell me, which digital camera has the fastest zoom lens?
Other august group members have already replied to it.
> 2. Do they manufacture P&S digital camera with a fixed lens nowadays? I
> always see that it has at least 3x optical zoom. I am referring to the
> estinguished camera brand names (Canon, Nikon, Pentax, Olympus, Fuji,
> Lumix, Kodak,etc) , not those cheap 1MP cameras. Thanks for info.
There are still a few fixed focal length P&S cameras in the market.
aniramca@gmail.com wrote:
> Correct me if I am wrong. F/stop usually refers to how fast the lens
> is, or how abundant the camera can get the light behind the lens. I
> recall some of the old Canon lenses can have an F/stop to close or
> below 1 on their fixed lenses ( F/0.95 or F/1.1 in 50mm lenses). Zoom
> lenses are typically slower (started with F/stop around 2.8 or 3.5).
>
> How does this applied to the P&S digital cameras? I realize that all
> or most of the digital cameras nowadays has a zoom lens, instead of a
> fixed lens. Two questions:
> 1. Could anyone tell me, which digital camera has the fastest zoom
> lens?
> 2. Do they manufacture P&S digital camera with a fixed lens nowadays?
> I always see that it has at least 3x optical zoom. I am referring to
> the estinguished camera brand names (Canon, Nikon, Pentax, Olympus,
> Fuji, Lumix, Kodak,etc) , not those cheap 1MP cameras.
> Thanks for info.
>
Most brands have at least one model that has a fixed lens, at the lowest
price point. Just check the specifications.
On Sat, 12 May 2007 22:07:57 +0100, "Trev"
<trevbowdenAT.dsl.pipex.COM> wrote:
>
>"Michael J Davis" <?.?@trustsof.demon.co.uk> wrote in message
>news:fsu+kKFjYiRGFwKH@trustsof.demon.co.uk.invali d...
>> aniramca@gmail.com observed
>>>Correct me if I am wrong. F/stop usually refers to how fast the lens
>>>is, or how abundant the camera can get the light behind the lens. I
>>>recall some of the old Canon lenses can have an F/stop to close or
>>>below 1 on their fixed lenses ( F/0.95 or F/1.1 in 50mm lenses). Zoom
>>>lenses are typically slower (started with F/stop around 2.8 or 3.5).
>>>
>>>How does this applied to the P&S digital cameras? I realize that all
>>>or most of the digital cameras nowadays has a zoom lens, instead of a
>>>fixed lens. Two questions:
>>>1. Could anyone tell me, which digital camera has the fastest zoom
>>>lens?
>>>2. Do they manufacture P&S digital camera with a fixed lens nowadays?
>>>I always see that it has at least 3x optical zoom. I am referring to
>>>the estinguished camera brand names (Canon, Nikon, Pentax, Olympus,
>>>Fuji, Lumix, Kodak,etc) , not those cheap 1MP cameras.
>>>Thanks for info.
>>>
>>
>> 1. If you mean non interchangeable lenses, then I recall an F2.0 Leica
>> Digilux 2
>> http://www.dpreview.com/reviews/leicadigilux2/
>> or an f2.4 zoom on the Sony DSC-R1
>> http://www.dpreview.com/reviews/spec...sony_dscr1.asp
>>
>> 2. Don't know.
>>
>> Mike
>>
>> [The reply-to address is valid for 30 days from this posting]
>> --
>> Michael J Davis
>> <><
>> Some newsgroup contributors appear to have confused
>> the meaning of "discussion" with "digression".
>
>
> The 3x zoom on the early G series canon and Casio 3 to 4000 was F2
>
Yes, the good old days when high end P&S cameras offered good
quality fast lenses like my Canon G2 (f2-2.5, ), a hot shoe, & RAW
mode!
In all fairness, faster lenses were needed more back them
because the electronic read noise was higher. The G2 has a 4MP,
1/1.8" CCD & the G7 has 10MP on the same physical sized sensor. As I
see it, dropping RAW mode & the swivel LCD form the Gx line may signal
the end of the Gx line.
Thankfully the MP race seems to have stalled @ about 10MP so I
can only hope that manufactures may be getting ready to offer more
useful features again. Face recognition & Image Stabilization (IS)
can be very useful features for many P&S users.
A hot shoe on the new S5 IS is a nice added feature to that
line. It does make me wonder if that's not just 1 more nail in the Gx
series coffin.
I'm still hoping for 4 or 5MP B&W/IR *only* P&S with a high
dynamic range & greater usable ISO. That may or may never happen
because I know that this may be a fairly small niche market but I can
only hope & wait.
Respectfully, DHB
"To announce that there must be no criticism of the President,
or that we are to stand by the President, right or wrong,
is not only unpatriotic and servile, but is morally treasonable
to the American public."--Theodore Roosevelt, May 7, 1918
Fastest P&S digital camera 
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