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Canon XH Series HDV Camcorders
Canon XH G1S / G1 (with SDI), Canon XH A1S / A1 (without SDI).


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Old December 1st, 2007, 03:17 AM   #1
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Zoom stops

More a remark than a question...

It's a pity that the A1 doesn't have any straight forward reference to the zoom/focal stops.

It has a lens that in HD runs from focal distance 'SLR' equivalent of 32,5 to 650mm. It was almost by accident that I discovered under the 'custom functions', 'zoom indicator' you can switch from a dial to number indication. Doing this, a small calculation (assuming the lens behaves linear) leads to the following (I only retained the relevant 'photographic' numbers):

Number / focal d mm

0 32,5
3 51,22
11 101,14
17 138,58
27 200,98
43 300,82
59 400,66
91 600,34
99 650,26

This is surely of interest when you care about framing and the spacial look of your footage. Imagine that in photography it is hardly mainstream to walk around with anything above 200mm's... being in the A1 at about 1/3th of the zoom scale.

I also understand this won't be very accurate, but comparing it to a SLR, it should match to a certain extend. I've the impression it's a little bit more wide-angle in the lower numbers.

Anyone having thoughts on this?

Last edited by Dirk Bouwen; December 1st, 2007 at 12:08 PM.
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Old December 3rd, 2007, 11:31 AM   #2
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Quote:
Originally Posted by Dirk Bouwen View Post
(assuming the lens behaves linear)
Well the focal length range is curvilinear, not rectilinear, so these values are not accurate, sorry.

I'll try to dig up the actual focal length values.
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Old December 4th, 2007, 12:13 PM   #3
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Thanks, Chris. I'm looking forward to this.
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Old December 20th, 2007, 11:28 AM   #4
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correction

Quote:
Originally Posted by Dirk Bouwen View Post
More a remark than a question...

It's a pity that the A1 doesn't have any straight forward reference to the zoom/focal stops.

It has a lens that in HD runs from focal distance 'SLR' equivalent of 32,5 to 650mm. It was almost by accident that I discovered under the 'custom functions', 'zoom indicator' you can switch from a dial to number indication. Doing this, a small calculation (assuming the lens behaves linear) leads to the following (I only retained the relevant 'photographic' numbers):

Number / focal d mm

0 32,5
3 51,22
11 101,14
17 138,58
27 200,98
43 300,82
59 400,66
91 600,34
99 650,26

This is surely of interest when you care about framing and the spacial look of your footage. Imagine that in photography it is hardly mainstream to walk around with anything above 200mm's... being in the A1 at about 1/3th of the zoom scale.

I also understand this won't be very accurate, but comparing it to a SLR, it should match to a certain extend. I've the impression it's a little bit more wide-angle in the lower numbers.

Anyone having thoughts on this?
I revised the above with some measurements and calculations, and though I'm pretty sure it won't be mm-accurate, after a comparison with SLR it surely won't differ too much:

zoom reading / mm focal distance

0 33
5 40
10 45
20 50
40 75
60 125
75 180
90 350
95 500
99 650
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