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Old Oct 21, 2007, 10:36 PM   #1
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Join Date: Oct 2007
Posts: 3

Just bought a Sony HDR HC7, and I need to purchase a wide angle lens extension for indoor walk-throughs for real estate sales videos.

The Sony lens retails for about $360, which is pretty expensive for a screw-in extension.

As I recall, the Sony lens is 0.7, which tells me very little.

I was searching for aftermarket lenses, and found a pair of Cokin lenses that will fit. The wide angle lens is 0.5 magnification. The telephoto is 2.O. And the price for the pair is $150, compared to $720 for similar in the Sony brand.

Can anyone tell me if Cokin lenses are okay? And is 0.5 even wider than 0.7?? Or less wide?

Thanks in advance.
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Old Oct 22, 2007, 5:00 AM   #2
Join Date: Feb 2006
Posts: 96

Not sure about the quality of Cokin lenses. Their filters have a good reputation. As far as the focal length multiplier is concerned, a 0.5 is going to be wider than a 0.7.

Simply take the wide angle focal length of the existing lens on your camera eg. 35mm and multiply it by the factor quoted by the add-on lens manufacturer. Thus a 35mm lens is going to have its focal length modified to 17.5mm by the 0.5 lens and 24.5mm by the 0.7 lens.

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Old Oct 22, 2007, 10:14 AM   #3
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Thanks Ron. I was thinking the maths you mentioned.

I'm gonna take a chance on the Cokin lenses.
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