 Dennis Creaghan |
Zoom lenses Is it a characteristic of zoom lenses that the longer the zoom, the less chrisp and clear the image?. or does it depend on the quality of the lens? I'm using a canon 10D with a Sigma 28-105 1: 2.8-4 aspherical lens and zoomed in it's very muddy. If anyone can recommend a good all purpose lens, I will send you my first born. Thanks Dennis
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Tony Sweet |
Dennis, I don't need anymore kids! But...the muddy look to which you refer could be caused by flash underexposure or just general underexposure. Don't forget that you lose a stop when zoomed in and need to readjust your exposure, if you're shooting manually. If you're on auto exposure, the zoom shouldn't make any difference in your exposure. Is the lens compatible with the Canon D10? Tony Sweet
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Piper Lehman |
Dennis, Check out some of the reviews of this lens. Sometimes certain lenses lose quality at the extreme ends of the zoom. You might try shooting at f/8 at the zoomed end and see if this improves the sharpness at all. Most lenses are best in the 'middle' as opposed to their extremes - both zoom- and aperture-wise. Check out Thom HOgan's Nikon site. I think he has some Sigma reviews there.
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Piper Lehman |
Forgot to add that you're going to pay in order to get a great all-purpose lens. There is no do-it-all glass out there, but some of the best come close. I recommend sticking to Canon models. The faster the better. I'm a Nikon user, but I'm sure it's the same with CAnon. Try the Canon lens of the same focal length as your Sigma, and then start pricing them out from there. Prime glass is going to be your sharpest, but then, this defeats the all-purpose issue. You'll likely give one option up in order to get the best of another.
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doug Nelson |
At the long end of zooms, we all sometimes forget to hold it STILL. It's harder to hand hold at longer focal lengths. That old "rule" about the inverse of the focal length being the slowest speed at which you can hand hold: lens at 200mm, hand hold at 1/250th. I don't believe it. I try to go a speed faster. Watch sports photogs on the sidelines. They use at least a monopod, even with Image Stabilization lenses.
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Dennis Creaghan |
Thanks Piper Tony and Nick for your responses. I'm very guilty of not using a tripod at the longer settings which magnify even the slightest tremor, and I will check out the web site. I can't get rid of that kid eh?
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