Posts Made By: Roland Christen

Great Stuff!

Rolando

Rod Kaufman said:

http://www.sciencedaily.com/releases/2014/03/140327142447.htm
Perhaps we'll see a new application to deflect light pollution...one can only hope.
Presently, I've taken stacking of three light pollution filters(0111,CLS,NPB) and used them successfully to suppress light pollution on certain objects but the method described above *might* be an alternative to deflect unwanted light while lending itself to the addition of one or more filters. Seems like an exciting application!

In a telescope, light pollution is coming in at the same angle as the object you are trying to image. It does not have a different angle, so this type of filter is useless for that purpose.

Rolando

Comparison of our relatively short exposure with a 50 hour exposure taken by the 90inch scope at La Scilla in Chile (on the mountain just down the coast from ours).

Yeah I know, we just need to try harder next time, ours was barely 2 hours total exposure.

Rolando

Closeup of the jet at 200% size.

Ernie Spragg said:

hi - how large a Dob is large enough? how big is too big? thanks - Ernie Spragg Fresno CA

Go to Obsession website. He explains how to choose a size right for you.

Rolando

This is a max resolution crop of M61 showing the core detail.

Rolando

Just to compare M13 with the larger glob in the southern hemisphere, here is Ignacio's Omega Centauri. Image was taken with a 130F6.3 AP refractor, a Canon digital camera and a drizzle technique that increases resolution:

http://www.pampaskies.com/gallery3/var/fulres/OmegaCent_drizzle_hires.JPG

Ignacio's full post:

Last Saturday I had the most productive session in my four years of astroimaging. Perfect weather combined with a new moon, a long winter night, and a working setup, allowed me to collect about 8 hours of data on three objects. The only thing that bothered a little was high humidity and dew. But that's typical of this location, so I am used to it.

Anyway, as the seeing at dusk was quite good, I decided to revisit this old friend, Omega Cent, to try to capture some of the IFN around it, as this would be the first time I image it from rural skies. With a fully cooled canon 6D (sensor at -5°C) at prime focus of the AP130GT, I collected a bit over one hour, while the cluster was going thru the meridian up in the sky.

The set of 22 3-minute frames was processed using a new drizzle module in pixinsight, that includes pixel rejection (quite novel), to enhance resolution. There is a hint of IFN in the background, although it clearly requires a longer integration.

low-res with data: http://www.pampaskies.com/gallery3/Deep-Space-Objects/OmegaCent_drizzle

high-res (14MP): http://www.pampaskies.com/gallery3/var/fulres/OmegaCent_drizzle_hires.JPG

cheers
Ignacio

Excellent! That's for sure.

Rolando

Thanks everybody

Rolando

Just beautiful!

Rolando