1. The in-front-of-the-lens converters are just concentrating the light
rays. Tradititional converters are extra lens elements that change the
focal length and focal ratio, thus the light reaching the film. (I hope
that didn't sound too lame.)
2. Zoom ratios are always a trade-off. Higher ratios usually mean larger,
more complex mechanisms, and possibly lower quality at some point. You also
may get slower F/ratios on the telephoto range. I have a Canon G2, and
certainly would like more range than the 3x it has. But I'd have to give up
the form-factor and high apertures. You can't have it all, as they say.
Look at the size of the 28-200 lenses that are available for 35mm SLR's.
They're certainly not small (and they give up quality a fixed F/stop, and
high aperture to get that big zoom range). Also look at F/2.8 zooms like
the Zuiko 35-80 and Canon L series lenses. They're not svelte either.
Skip
From: William Clark <wclark@xxxxxxx>
Reply-To: olympus@xxxxxxxxxxxxxxx
To: "'Olympus List'" <olympus@xxxxxxxxxxxxxxx>
Subject: [OM] Two technical questions
Date: Tue, 29 Jan 2002 12:17:26 -0500
Issues I am thinking about:
1. I just actually read the instructions that came with my A-200
teleconverter and B-300 teleconverter (I use them on the Olympus 2100 uz
dig
cam). The instructions say that there is NO affect on aperture when using
them. How is this possible? I thought a TC always affected the amount of
light coming in.
2. This is a digital camera question. My 2100uz has a 10x optical zoom.
Why is it that most dig cams are 2,3, or 4 x optical zoom. Even the
amazing
E20 is just 4x. Is there a physical limitation of some sort?
Enjoy the day!!!
-Bill
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