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  1. #1
    No, that's not phonetic
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    New question here. Can someone 'esplain focal length, sensor size, field of view, etc

    With 35mm film cameras, all the models had the same image capture area (1x1.5") so all lens focal lengths were comparable. I *knew* what sort of field of view (FOV) a 28mm lens would offer.

    With a smaller image capture element in a digi SLR, the same lens offers a somewhat telephoto effect. Many digi cameras will list the real focal lengths in mm (say a 5-20mm zoom) along with the 35mm equivalent (28-112mm), but this still is a relationship between focal length and image sensor size. It would be more useful to just know the diagonal FOV at the wide and tele end.

    Is there a place where you can see all the popular cameras compared in terms of their FOV? Some advertise it (like GoPro) but many do not, not even on the manufacturer's website. WTF? They just say vague stuff like "wide". This newly announced Kodak has NO information on FOV or focal length at all and not even a vague term like "wide", and that frankly seems typical. In this Macworld Vado HD review they were nice enough to compare image coverage between the Vado, Zi6, and MinoHD, otherwise you would be hard pressed to guess the FOV.

    Any resources or specification pages I missed somewhere?
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  2. #2
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    Yes, it seems that with Helmet cams some companies lack that info, but as the digital revolution rages on it looks like the helmet cam industry is going for a straight FOV in degrees (which I prefer)

    Here is a comparison on a few cameras - this particular review is a year old but other reviews on my site will make note of the cam's FOV (a big pet peeve of mine). http://www.helmetcamreview.com/4camShootout.htm

    Here is a review comparing the STD go pro to the wide: http://www.helmetcamreview.com/GoProStdVsWide.htm

    If I test a cam without the published FOV I will measure it myself and publish, but I have not done that since my last "bullit cam" review quite some time ago.

    Hope this helps.
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  3. #3
    No, that's not phonetic
    Reputation: tscheezy's Avatar
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    Yeah, comparisons like that are invaluable. It amazes me that a manufacturer would not bother letting potential customers know such a totally fundamental specification. It would be like leaving out the sensor pixel count.
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