Eta Carina Widefield

[gregbradley]

It was clear for a large part of last night. Seeing was average to weak but it does not affect a wide lens type image so much.

A quick Eta Carina.

https://pbase.com/image/169050011/large Colour and Ha

https://pbase.com/image/169050021/large Ha only.

Greg.

[Peter Ward]

A great wide field eta..seeing doesn't affect the data much at 300mm. Sadly for me there is not enough back focus with the STX to use it with camera glass.

BTW I used the Taka 0.73 reducer on the BabyQ recently, which pulls it down to around 300mm as well...have to say the stars from the Pentax glass are very comparable :thumbsup:

[gregbradley]

Thanks Peter.

The Pentax 67 and 645 as I recall (I can look it up) have a lot of backfocus for a camera lens. From memory its something like 85mm or more. One of the longest of all lenses which I think is another reason why they have been popular for astrophotography.

Good to know about the lens performance. I have a step down ring on it so its doing F5.17. F4 is fine except I was getting some odd shapes in the blue channel.

Greg.

[strongmanmike]

Yeah great field that Greg :thumbsup:...could do some nice big vistas with that.

Mike

[codemonkey]

Very nice, Greg!

[gregbradley]

Thanks Mike. Its a poor mans FSQ!



Cheers Lee.