M 57 - Ring nebula in Lyra

A few 30s light frames through a 150mm f/5 reflector and 7D @ ISO 400.

100% crop inserted in the frame.

Enjoy

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ecce_lex wrote in post #12326292
A few 30s light frames through a 150mm f/5 reflector and 7D @ ISO 400.

100% crop inserted in the frame.

Enjoy

Nice shot, can you post a pic of your scope with the camera attached, just curious....

Unfortunately, I haven't taken pictures of the setup. But that shouldn't be a problem.. as we have our good friend google that has a nice collection.

Just a short explanation I find useful related to the terminology used. When talking about astrophotography, "150mm f/5" means an instrument with a diameter of 150mm and a focal length of 750mm - the essential feature of an instrument is its diameter, so that's the first information given.

So do not expect to see M57 as large as on this picture using a 150mm FOCAL length.

Cheers

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Great shot and great FOV with the small M57.

Try for longer and more exposures, you might just start to bring out the inner stars of the nebula.

Looks good , can you post an image without the enlargement attached please ?

Thank you for your comments.

I will post a nice wide field, full res and with no inserts. It was a quick^n dirty one in the excitement of the moment

I only shot 13 frames.. spent half the night getting the goto to work. Still doesn't. However, I am happy to report that the mag 15 white dwarf is visible. Not bright, but there none the less.

I realised I have no idea of the relative sizes of the Messier objects. maybe someone can point me to a set that was shot at the same focal length? Except for Andromeda, all should fit in my 750mm frame (on crop senzor) - but some will be very small?

Those will be trial and error for that size scope but you can check at Celestrons' website for the Omni 150mm scope images . Pretty much the same scope and there is some images to show you what to expect .

http://www.celestron.c​om …t.php?CatID=63&​ProdID=433

ecce_lex wrote in post #12332052
I realised I have no idea of the relative sizes of the Messier objects. maybe someone can point me to a set that was shot at the same focal length? Except for Andromeda, all should fit in my 750mm frame (on crop senzor) - but some will be very small?

CCDCalc is just the tool for you. You select your object, camera and lens/telescope and it will show you an image scaled to suit.

Steve.

Thank you for the links, very useful.

Here is a link to the full version : https://picasaweb.goog​le.com …9gIMLblSQ?feat=​directlink

Cheers