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Canon EF-S 55-250mm f/4-5.6 IS STM Lens

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Hello guys

i was wondering if any one had used the Canon EF-S 55-250mm f/4-5.6 IS STM Lens lens.  is it any good for astro use, as well as day use? (but mainly astro)

also what exactly does the STM do?

Many thanks


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I have not used this lens for astro but it is a good all rounder the STM as said uses a stepper motor for focussing and its quite smooth in opperation much better than the standard kit lenses that have a very slack action and limited focus movement, this should help if pointed at the sky.


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I have the similar non-STM EF-S lens. It's good for daytime photography but not the best for AP. Here's a 1 minute shot of Andromeda taken at 250mm/f5.6, note the elongated stars in the corners. Stepping it down would improve this but would also make it quite slow. My old SMC Takumar 200mm f4 is a far better lens for AP.

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