Low light digital camera f stops etc..

[Neil McNaughton]

I posted on this topic a while back and got some good advice - but before
shelling out lots of ?? I would like to ask for some more advice...

I am looking to upgrade because I am not getting the shots I need - low res,
low light mug shots of speakers in conferences from not inconsiderable
distance..

My current camera is a Sony Digital Mavica FD73 with the following specs
according to the documentation....

Image Device 1/4 inch CCD
Lens f=4.2-42mm (40-400mm when converted to a 35mm still
camera)
F1.8-2.9

On the camera itself the lens is quoted as f=4.2-42mm 1:1.8 [phi] 37

As I am contemplating the purchase of a new digital camera with a F2.0 lens
I am a bit puzzled by the above info which suggests that my old Mavica has a
F1.8 lens - even though it is obviously a lot smaller than the one I am
contemplating (A Sony CyberShot DSC F717)

FWIW the Cybershot spec gives
Focal length 9.7-48.5 (38-190mm equiv.)
Aperture f2.0-2.4

But how do these lenses compare 'like for like' - ie how do the fstops
compare at full zoom? Will I really get more light from the Cybershot.
Related question is what progress on the CCD end of the cameras has been
made since the Mavica days?

Sorry of this is badly formulated question. I am confused - any
enlightnement gratefully received.

Neil

[Deathwalker]

quite often if you zoom to the 'tele' end of the zoom the maximum
aperture is a very slow 5.6 or even 8.

"Neil McNaughton" <in...@oilit.com> wrote in message
news:c9prif$sba$1...@news-reader4.wanadoo.fr...

[dennis.ri...@gmail.com]

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