My take on NGC 3918

[raymo]

Taken at 3,000mm focal length, and enlarged to somewhere around
a 20,000mm f/l image. The plainer image was just tweaked a little in PS,
and the more detailed image had the contrast increased a bit. I don't know whether the pattern is genuine, or a product of the increase in
contrast. I have never seen a high quality close up image of 3918
compare it with. 10 secs @ 1600.
Sorry about the huge size difference; I stuffed up.
raymo

[Flugel88 (Michael)]

Wow that's a tiny target you chose there Raymo at around 8-10 arc/s according to Wiki.
The only images i can find with any real detail were done with Hubble.

I love images of these quirky little Planetary Nebulae

Thanks for sharing Raymo

[raymo]

Thanks Michael. It was a single sub. I might try again with a longer focal length, and stack some subs, to see if it is possible to get any detail at all
with my modest gear.
raymo

[raymo]

Having looked at a Hubble version of this, I see that the pattern is genuine. I really must try for a better rendition.
raymo

[Flugel88 (Michael)]

I found this image taken by Steve Crouch from Canberra.
Using his 36.8cm RCOS

http://members.pcug.org.au/~stevec/n...STL6303_RC.htm

[raymo]

That's quite different from both the Hubble one and mine.
How can it be blue, when visually it is bright green?
raymo

[Flugel88 (Michael)]

I think the blue colours are perhaps a product of the Narrow band Data blending done for that image

[raymo]

I didn't see the info beneath the pic.
raymo