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mikehab

Minimum equipment for imaging Rosette?

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Hi - I am wondering whether it is possible to image the Rosette nebula without any kind of tracking mount, an un-modded DSLR (60D) and either a standard 250mm lens or 400m scope attached?   According to Stellarium the nebula should fit easily into a 250mm f/3.5 lens field of view, and perfectly in a 400mm f/5.6 ST70 scope fov - but without tracking the maximum exposure times are only going to be around ~2" and ~1.25" respectively (roughly).

Is it even worth trying with this kind of very basic setup or would I be wasting my time anyway?

Would adding some kind of light-polution (or other) filter help - or is this nebula one that specifically requires filters in order to even see anything at all?

Thanks in advance,

Mike

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Any object apart from the brightest ones are going to be hard without a tracking EQ mount. Not impossible but you have to tailor your expectations to suit.

The rosette is a fairly large and IMO challenging target, I've managed to capture it (albeit faintly) with a Nikon so it's not impossible. My best advice is to give it a bash and experiment.

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A tracking mount with guiding if not your  subs will be limited to about 30s ( a well aligned Astrotrack can do 120s with a 300mm lens unguided ), a modded DSLR with a good light pollution or nebula filter, a decent 200~300mm fast lens and about 3 hours of data.

A.G

Edited by lensman57

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I got a reasonable pic of the Rosette using a 340mm or so focal length scope (just about right to fit it all in) with about 2hrs of data in 5min guided subs.... it's a feint object (in comparison with M42 for example) and I doubt you'd get much even at high ISO at 30 sec exposures and at 300mm fl on a tripod you'd get star trails after a second or two.. As has also been said, an hour or two of data would be needed to see much at all... save it for when you have a motorised mount and, even better, when you have guiding.

Ben

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