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High Resolution widefield image of Horsehead

used AP155EDF f/7 and PL39000M camera
Red= 15 x 15min
Green = 9 x 15min
Blue = 18 x 15 min
Lum = 18 x 15 min

total time was 15 hours.

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Comment by Richard Crisp on January 12, 2012 at 8:11am

I added Linearity to the performance brief....

Comment by Conor on January 12, 2012 at 3:37am

This entire comments section needs to be archived somewhere appropriate for people as a hardware reference.

Comment by Richard Crisp on January 11, 2012 at 6:13pm

here's the performance brief: I updated the PTCs and revised the summary values.

Comment by Marc Basti on January 11, 2012 at 5:29pm

Synthesize the green from red and blue? I've never tried it, is it an adequate solution in something like this. Marc

Comment by Richard Crisp on January 11, 2012 at 4:53pm

Hey Trevor... Glad you liked the image! The thread has been fun and interesting but not much about the image.
what I find interesting are the green channel reflections from Alnitak

check these out.....

the system is the AP155EDF f/7 with AP 4" field flattener and then a filter wheel with 50x50mm square filters. The filters-en-carousel are the stop in the system.

The sensor has no microlenses. The Sensor is 36.8 x 49mm. the filters are commonly used with 16803 (36.8x36.8) and do not vignette, in my case I get vignetting with that optical system because my sensor is larger in the X direction than is a 16803....

Comment by Richard Crisp on January 11, 2012 at 4:47pm

yes, fishing analogy... where there are crowds doesn't mean there are the best deals, best products, etc... it means there are crowds...

it might mean any or all of those good things but there's not a causal relationship...

Comment by Trevor Woodrow on January 11, 2012 at 4:37pm

Crisp...did you really just hit us with a fishing metaphor?

Charlie...damn marketing people!

Comment by Trevor Woodrow on January 11, 2012 at 4:24pm

HOLY POOH! Anyone viewing this on full size and scroll through...I just scrolled to the top left corner and rolled right. I don't have the super cool moniters that some of you gents have, I am on my crappy work laptop, but I I scrolled across I found three obvious galaxies and another 3-4 suspects! And that is only in the top 1/4 or 1/5 of the image. Sweet image, great work!

Figured since everyone was commenting on this might come by a take a look. Glad I did.

Comment by Charles Dunlop on January 11, 2012 at 4:13pm

Technical vs. Marketing. Business world is full of companies with the greatest technology in the world and not selling products, where some whiz bang marketing guy promotes an inferior product and takes the market. Common in fact.

Comment by Richard Crisp on January 11, 2012 at 4:11pm

Marc and others: regarding crowds... just because lots of people buy the same thing doesn't mean it is any good nor does it mean it is a good deal. It just means that a lot of people bought the same thing.

I used to do a lot of fishing... My brother and I would leave the beach near Galveston, Texas and maybe stop near the end of the jetties. Typically we'd stop because there would be a couple of boats stopped there fishing.

Usally a bit later another boat would drive by and many times they'd also stop and drop anchor. Within an hour or two we might have 20 boats there... all figuring these guys must really be into the fish and the reality is no one was even getting a bite...

The same herd mentality, with cult-like irrationality, seems to apply to astro-purchasing and astro-processing....

It would be nice if things were marketed and sold on the basis of objective and non-ambiguous criteria but that is not the case.


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