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SIGMA 70-300 mm f/4-5.6 DG Macro Telephoto Zoom Lens


leemanley
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Hi,

I own this lens but I wouldn't recommend it for Astro work. For slightly cheaper you may be better off going for this 50mm prime.

http://www.amazon.co.uk/Canon-EF-50-1-8-Lens/dp/B00005K47X/ref=sr_1_1?ie=UTF8&qid=1371974082&sr=8-1&keywords=canon+50mm+lens

If it was me I'd go for as wide a lens as possible but I've not attempted imaging the Milky Way. I'm sure someone else on SGL will give you the advise you need shortly.

Al

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I had the APO version and it was a great bit of glass , BUT it was so smooth/loose in the Zoom that every time I pointed it above 45 degrees it would creep down and un-zoom itself.

Had to swap it for the Canon version .

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Plasticky it might be but the optics are very good for the money....

To get decent star shapes corner to corner it will need to be stopped down to around f3.5-f4...

Use MF (or use AF on the moon then switch to MF).

I use a bit of blue tack or micrpore tape to stop the focus ring creeping...

Peter...

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