Re: Question from a optics illiterate.

From: Leonard Migliore (ora_at_laserk.com)
Date: 02/25/05 

Date: Fri, 25 Feb 2005 10:43:43 -0800

In article <NMHTd.50175$Am3.1559703@news20.bellglobal.com>,

> OK I get the gist of what you mean. I re measured my sensor and it's
> near as damit to 9 mm by 7 mm which gives me about an 11 mm diagonal so
> I should be looking for a 2/3" which translates to a 16.933 mm diameter.
> And from the chart I find these two examples of lenses that would be a
> match:
>
> Camera Sensor Type Pixel count Sensor
> size
>
> Sony DSC-F717 2/3" CCD 5.2 million 8.8 x 6.6
> mm
> Minolta DiMAGE 7Hi 2/3" CCD 5.2 million 8.8 x 6.6 mm

No, those are whole cameras which happen to have 2/3" sensors and you
can't easily take the lenses out of them. An example of loose lenses
that you can put on your camera is here:

http://www.edmundoptics.com/onlinecatalog/displayproduct.cfm?productID=12
75

Again, the world is rife with C-mount lenses and they are available at
low cost from many sources. You just have to decide what field of view
you need and then pick an appropriate focal length. For a 2.3" sensor, a
12mm focal length will give you a horizontal field angle around 40
degrees, which is considered a "normal" perspective. Shorter or longer
focal lengths will alter the field angle for wide angle or telephoto use.

Relevant Pages

  • Re: Why full-frame?
    ... >> that can't be found in Canon or Nikon's cameras based on APS-C sized ... > think any zooms that fast are available for APS-C sensors. ... > Of course these lenses are breathtakingly expensive. ...
    (rec.photo.equipment.35mm)
  • Re: Aperture size and camera phones.
    ... Small sensors use very short focal length lenses. ... Cameras work best when lenses can bring as much light as possible to focus ... When lens focal lengths get to 12mm and less the absolute size of the ...
    (rec.photo.digital)
  • Re: Minolta Thoughts..
    ... cameras at the level just above a digital Rebel is a good example). ... a large investment in a Maxxum 7 and eight nice lenses that I am holding ... What is being called "full frame sensors" are really 35mm sized ... The standard DSLR sensors are better than all but the best ...
    (rec.photo.digital.slr-systems)
  • Re: Product Endorsement
    ... when full frame 35mm sensors on domestic level cameras can only be a ... Some cameras have them now purely because it allows older lenses to be used "1:1." ... If enough smaller-sensor camera bodies are sold, then the reverse logic starts to apply, phasing out the old lenses in favor of a more-modern body, and selling more "digital" lenses to ensure that small-sensor bodies don't become obsolete. ... The investment in the Canon lenses is long-ago amortized, and there are other reasons to go with the Nikon. ...
    (alt.guitar.bass)
  • Re: 35mm equivalent f/stop
    ... f-stops of very short focal length lenses. ... even a cursory examination of the f-stop ranges in small sensor cameras will ... lenses with APS-c and smaller size sensors, not the noise inherent to the ...
    (rec.photo.digital.slr-systems)