Eagle and Swan

[avandonk]

I reprocessed some data along the lines of the Lagoon and Trifid images here
http://www.iceinspace.com.au/forum/showthread.php?t=16030

Details.
Canon 5DH Canon 300mm F2.8L at F2.8, Hutech LPR filter, 14x240sec at ISO 400. Corrected for flats with ImagesPlus, stacked with Registar and digitally developed in IP. Only adjusted levels in PS.

Eagle and Swan 2.2MB
http://members.optusnet.com.au/~avandonk1/EAGLE&OMEGA.jpg

Zoom in and check out the detail. The uncompressed jpg is 13MB. If you view it at 100% of your monitor resolution the ful image size is about 1300x850mm.

Bert

[RB]

Very nice Bert.
I like it.

Just a quick question, how do you attach the Hutech LPR filter to the 300mm f2.8?
What size is the filter?

[iceman]

Very sharp and very nice. I find it a little too pinky for my liking.. just not sure how much Ha is around that area? Maybe it's suppsoed to be pink :)

[avandonk]

The Canon 300mm F2.8L has a rear 48mm filter holder as do all the super telephotos from Canon (some have 52mm). Same thread as an eyepiece. This slot also takes a circular polarizing filter which can be rotated by a small wheel from the outside. You can see there is method in my madness. I don't think a 110mm LPR filter would be cheap or even available.

Bert

[avandonk]

Mike if I got rid of the pink you refer to both nebulae would disappear. Most people are used to widefields with film not Halpha enhanced DSLR's. I dont think you can find a better widefield anywhere. If you do let me know.
Of course the LPR filter could (and is) biasing the image somewhat. I am only trying to get real signal into the image.

Bert

[RB]

So basically you can use any of the 2" filters that we use in our scopes for use in the 300mm as well, is that right or did I missunderstand?

I knew about the drop in filter on the 300mm but I thought it was only for geletin type filter usage.

And Bert, am I right that your lens is the non IS version? (from memory).

[avandonk]

Yes you are right on all counts. The original filter for the 300mm was a gelatin holder. I bought a 48mm (same as eyepieces) filter holder very soon after. Yes my 300mm F2.8L is the non IS version. The IS version is not as good for astro as the non IS. My theory is that any optics that can move to compensate for lens movement cannot then be exactly aligned when one turns the IS off. Is the 'park' position perfectly aligned. My gut says NO.

Can it take a better terrestial picture at lower than optimum shutter speeds, of course!

Bert

[Ric]

Great image Bert. lots of fine detail in that one

Very nice indeed.

Cheers

[Garyh]

Very nice Bert ! pinpoint stars from edge to edge..
and lots of fine detail...well done there.
Cheers Gary

[spearo]

Nice Bert,
very well focussed,
a lot of pink though...might just be me or my screen...
f