Lens specifications of the A1 lens in 35mm terms at DVinfo.net

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Old October 25th, 2007, 03:49 PM   #1
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Lens specifications of the A1 lens in 35mm terms

I'm wondering what the focal legth range is of the A1 lens in terms of 35mm. Also when I see an f stop of 1.6 is this truely 1.6 or something else really?

I'd appreciate some technical (formulas) explantion if possible rather than just numbers :)

Thanks.

Shiv.
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Old October 25th, 2007, 04:41 PM   #2
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I think the lens is 25mm-650mm zoom
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Old October 25th, 2007, 05:06 PM   #3
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It's about 31.5 mm on the wide end, which would be about 630 on the long end. I wish it did go to 25mm!

My guess is the f-stops are more like t-stops, but I don't know.
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Old October 25th, 2007, 11:38 PM   #4
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From Canon's website on the A-1

Focal Length: 4.5mm - 90mm (32.5mm - 650mm; 35mm photo equivalent)

Max. F/Stop: f/1.6 -- 35mm
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Old October 26th, 2007, 12:16 AM   #5
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When you zoom in the f-stop drops to f/3.6 or something.
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Old October 26th, 2007, 12:38 AM   #6
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For Shiv, please see my Canon XH A1 Frequently Asked Questions page at http://www.dvinfo.net/canonxh/xhfaq.php -- thanks in advance,
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Old October 26th, 2007, 03:11 AM   #7
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Thank you all for your replies. It is much appreciated.

Chris, I did look at the FAQ before asking. I guess I was looking for a question similar to the one I asked :)

Shiv.
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Old October 26th, 2007, 06:51 AM   #8
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Focal length and maximum aperture values are both explained on that page.
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Old October 26th, 2007, 07:03 AM   #9
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Yes they are. What I meant to say is that I was looking for a specific question and didn't find one that I thought would have an answer for me. I wasn't looking at the answers, just the questions.

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Old October 26th, 2007, 09:15 AM   #10
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Oops I missed it by a mm. 32.5, not 31.5. I find that to be wide enough for just about everything I do. So far I haven't had a need for a wide angle adapter and from past experience with an 8.5mm on a 2/3" chip camera, I doubt I'll need one. The same thing is not true for the XL series standard lenses. In shooting with a friend's XL2, I had the wide angle adapter on more than off. If I got the XL H1 I'd have to also get the wide angle lens.
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Old October 26th, 2007, 11:47 AM   #11
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Just keep in mind that the 35mm equivalent focal lengths are based on field of view, and are approximate. The aspect ratio of a standard 35mm film frame is ~3:2 while the camcorder does 16:9 or 4:3.
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Old October 26th, 2007, 02:43 PM   #12
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Don,

Right, I did forget to take that into account. So is the FOV of a 16:9 considered more than 3:2?
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Old October 26th, 2007, 06:29 PM   #13
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Wish there was a 32.5 - 650 mm "L" lens for D-SLRs!
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Old October 26th, 2007, 07:01 PM   #14
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Sigma has a 50-500. That's probably as close as you can get.
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Old October 27th, 2007, 08:03 PM   #15
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3:2 would correspond to 13.5:9
4:3 would correspond to 12:9
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