The Eta Saga continues...

[Peter Ward]

What do you do with a full moon and rare clear skies?
Eta-Carina of course!

The original is a 9000 pixel wide 8 panel mosaic...decidedly web-unfriendly, so...

Here's one for those with 4K monitors.... (http://www.atscope.com.au/BRO/gallery345.html)

[multiweb]

I like the way you think. Big Enchilada indeed. :thumbsup::thumbsup::thumbsup:

[rustigsmed]

i need a bigger tv!

awesome work.

rusty

[gregbradley]

That's fantastic.

Greg.

[Peter Ward]

Thanks Guys...colour would have been nice....but I only had a couple of hours to spare and needed a 'scope fix. :)

[clive milne]

needs a wider fov Peter.

[alpal]

That's nice Peter,
we would all love a Astro-Physics Riccardi-Honders Astrograph.

cheers
Allan

[NOMH]

Holy moly what a field of view!

JB

[Peter Ward]

Ta



Well...while mine's not for sale...every man has his price...:)



Should it be clear tonight I may go a little to the left ;)

[alpal]

Hi Peter,
I just bought 10" f4 Newt. - it's more in my price range &
that will keep me busy for a while. :)

cheers
Allan

[atalas]

Quite excellent Peter....those tiny stars blow my mind too!

[Regulus]

Nice, Nice, Nice, Nice, Nice!
Excellent result Peter.

Trev

[clive milne]

Politically?

Incidentally, on a serious note....
when you put forward the idea of doing a group buy on 1.5nnm filters, can you recall the specs, number of units in a production run, price point etc?

regards,
c.

[Andy01]

Bazinga! that is impressive indeed :)

[Peter Ward]

Left? Me? ..well a little... I still thank Gough for my education.:)

From memory they worked out at about $US 900 ea (in 2") i.e similar price to NB Astrodons, but with half the bandwidth again.

The response was underwhelming to say the least....:shrug:

[Placidus]

I am in love!

[SpaceNoob]

That's just a bit of a big field you've got there! :lol:

Very cool! Get some Oiii!

[pluto]

Very nice!
Looks great on my 235ppi screen :)

[clive milne]

Can you recall the manufacturer.... was it Alluxa?
They seem to be doing some pretty impressive filters - down to 0.5nm bandwidth with square transmission profiles.

[Peter Ward]

Just had a search through my old email, while didn't find the correspondence, I'm fairly sure it was Alluxa.

P.S. found it. It was them $US895 a piece for <2nm, min batch of 10x 50mm

[clive milne]

I'm really surprised that they didn't have the foresight to just make a batch and sell them directly. I'm sure that they would become a coveted item.

Incidentally, the following article article for SPIE goes into the background of the technology behind the Alluxa filters. It is very informative.
http://spie.org/x105131.xml

One very illuminating graphics shows the passband shift (by virtue of incidence angle) for a range of focal ratios. It would seem that if you chose your centre frequency correctly (0.5nm towards the red end) the emission line will still be un-attenuated for the full aperture of optical systems down to F5 for a 0.94nm filter with a square wave transmission profile. At F4 however, it basically falls apart.

btw) Have you ever considered trying your (solar) blocking filter on an emission nebula?
It should by rights have a 1nm bandpass.

best
c

[Paul Haese]

I like the expanse of the image buuuut, think it ought to be a bigger resolution so I can take advantage of my screen. :) I do like the contrast and the framing.