Halpha triffid

[Peter Ward]

First up, my thanks to Precise Parts, who modified their adapter database to allow the creation of a STX coupling just 4mm thick.

The reason: this was the required spacing for Alluna's AFFR reducer/corrector....which had to be within 1mm to be on spec.

The result: a 16" F6 with sublime correction to the edge of a 16803 CCD.

proof of the pudding here

I have to say I am very pleased with the results....really tight stars across the entire chip.

It's really nice when things work as advertised

[Andy01 (Andy)]

Looks great Peter, first class- going full NB I hope?

[batema (Mark)]

Stunning. What a beautiful scope.

Mark

[DJScotty (Scott)]

Lovely Peter.
Great to have the gear working perfectly

[gregbradley]

Beautiful image.

That's great to hear. It takes a while to get even top gear fully dialled in.
I know the process. Its worthwhile though when you get a breakthrough like that. Especially with gear that is still quite new to the Astro support industry.

Ashley is very good and has made lots of money from me!

Greg.

[alpal]

Great work Peter,
yes the stars are pin pints right across the whole field.
What is the FWHM on axis compared with the corners on the RAW frame?

cheers
Allan

[Peter Ward]

Originally Posted by Andy01

Looks great Peter, first class- going full NB I hope?

I'm not planning on it....the Triffid is more stunning in natural colour methinks

Originally Posted by batema

Stunning. What a beautiful scope.

Mark

Originally Posted by DJScotty

Lovely Peter.
Great to have the gear working perfectly

Thanks guys...I doubt it will ever be perfect, but have to say I'm happy with the result.

Originally Posted by gregbradley

Beautiful image.

That's great to hear. It takes a while to get even top gear fully dialled in.
I know the process. Its worthwhile though when you get a breakthrough like that. Especially with gear that is still quite new to the Astro support industry.

Ashley is very good and has made lots of money from me!

Greg.

Yep, I suspect Ashley has done well out of a few of us diehards. Sure not cheap, but, hey, if you want to make an omelette, you have to break some eggs

Originally Posted by alpal

Great work Peter,
yes the stars are pin pints right across the whole field.
What is the FWHM on axis compared with the corners on the RAW frame?

cheers
Allan

FWHM's were not astounding...about 2.5 arc sec. But I find the measure is a little meaningless in quantifying optics (more a measure of the seeing)...the spot size should be under 5 micron....but I never get seeing that good!

I do however like the fact that the core stars show no signs of bloat and are beautifully resolved. Always a good sign

[Atmos (Colin)]

It is very nicely resolved Peter!
I am a bit surprised that you don't seem to have picked up the back forums nebulosity. Your FOV appears quite similar to mine but shows very different in the background.

Black clipped maybe?

[Peter Ward]

Originally Posted by Atmos

It is very nicely resolved Peter!
I am a bit surprised that you don't seem to have picked up the back forums nebulosity. Your FOV appears quite similar to mine but shows very different in the background.

Black clipped maybe?

Not sure what you mean...this is just 2x 10 minute H-alpha exposures with very little processing.

There is of course much more signal in this location, in different parts of the spectrum

eg Here

(taken with the same telescope, sans reducer)

[Stevec35 (Steve)]

Looks excellent Peter

Steve

[Atmos (Colin)]

Originally Posted by Peter Ward

Not sure what you mean...this is just 2x 10 minute H-alpha exposures with very little processing.

There is of course much more signal in this location, in different parts of the spectrum

eg Here

(taken with the same telescope, sans reducer)

Attached is a single 10min Ha sub from a while back. Just stretched the histogram and saved.

EDIT: Looking at your image on my laptop, its easier to see some of the nebulosity than on my iPhone earlier today (of which I couldn't see any).

[astronobob (Bob)]

Heavens to murgatroid

[Peter Ward]

Originally Posted by Atmos

Attached is a single 10min Ha sub from a while back. Just stretched the histogram and saved.

EDIT: Looking at your image on my laptop, its easier to see some of the nebulosity than on my iPhone earlier today (of which I couldn't see any).

Nice H-alpha image. You've captured quite a bit more field...I've scaled and overlaid my data to better match yours...the differences and similarities are
interesting

[Atmos (Colin)]

It is a really interesting field, quite a lot of Ha floating around in the background. It's showing up a lot better now, possibly just lacking contrast in your big one making it difficult to spot that fainter stuff. Being 2x600s, not exactly a lot of data

Yours is certainly sharper!

[SimmoW (SIMON)]

Man, so crisp! An excellent start Peter

[codemonkey (Lee)]

Beautiful and sharp as a tack, Peter. A bit noisy, but that's what you get with 20mins of data. I hope you'll be adding some more data (and some colour) too?

[Paul Haese]

Still think this scope needs to be at a dark sky site. You could park it at my place. It might get a bit dewy though.

[Peter Ward]

Thanks Guys...but my only reason for posting was a demonstration of the field corrector...(As Gene Wilder said in Young Frankenstein: it's alive! )

I've no real plans to re-do the trifid anytime soon...not that the current Sydney weather (wettest July in 50 years ) would let me should I be so inclined....