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Old Apr 22, 2005, 4:13 AM   #1
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Hi.

Can I increase the zoom capability of my canon A85 by using a teleconverter lens? How much zoom I would get ?

Please advice.

Rajesh
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Old Apr 22, 2005, 6:14 AM   #2
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Using Canon's conversion lens adapter and their teleconverter, you'll have a telephoto zoom of 250mm. I used a Tiffen adapter to mount the CrystalVue Sharpshooter 8x monocular to my A20 to extend the zoom to 840mm. Tiffen probably makes an adapter now for the A85.
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Old Apr 25, 2005, 2:43 PM   #3
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I am sorry, I am a newbie. Is 250 mm is equivalent to 8x?

Thanks.

Rajesh
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Old Apr 28, 2005, 5:26 AM   #4
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The A85 lens is 3x, 35-105mm. 35mm x 3 = 105mm. Canon's teleconverter is 2.4x. 105mm x 2.4 = 252mm. 840mm is equivalent to 8x. 105mm x 8 = 840mm. When I use the 8x monocular on my A20, the camera must be mounted on a tripod. I cannot hand hold it and get sharp pics. The 2.4x Canon teleconverter will not zoom in as close to a subject as the 8x monocular, but you will be able to hand hold it. The general rule is that the shutter speed needs to be the reciprocal of the lens in order to get sharp hand-held shots. In other words, the A85 with 2.4x converter is 252mm so you would need to use a shutter speed of 1/250th second or faster to get sharp hand-held pics. The A85 with 8x monocular is 840mm so the shutter speed would have to be much faster to get sharp hand-held shots...1/840th second or faster... which means you would have to set the shutter speed on the A85 to 1/1000th second. This severely restricts the usefulness of the monocular. The 2.4x converter is the way to go. If you find you still need more telephoto length, you should consider buying something like one of Panasonic's superzoom cameras which has a 36-432mm image stabilized lens. Image stabilization allows the camera to shoot hand-held at slower shutter speeds than it would be able to do if the lens were not stabilized.
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Old Apr 29, 2005, 9:01 AM   #5
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Thanks a lot for your detailed explanation.

Regards,

Rajesh
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