LMC through light pollution

avandonk · #1 15-09-2005, 01:21 AM

Here is a pic of the LMC from suburban Melbourne 85mm at f 2.8 211secX20
stacked with Registar.Taken 7-9-2005.Where did the red go.

iceman (Mike) · #2 15-09-2005, 06:09 AM

Very pretty shot, nicely done!

btw are you coming to the ballarat starcamp?

atalas · #3 15-09-2005, 04:37 PM

Nice work avandonk !

Louie

davidpretorius · #4 15-09-2005, 04:42 PM

this is a great shot, i have been reading about this and i did not know it is a galaxy!

[1ponders] (Paul) · #5 15-09-2005, 04:44 PM

Its not an easy to drag the red out of avandonk. The ones I've tried have all ended up roughly the same colour as your. There's no denying you've got a great shot there though

asimov (John) · #6 15-09-2005, 06:52 PM

Very nice shot.

Striker (Tony) · #7 15-09-2005, 07:59 PM

Nice shot....what made you come up with "211 second x 20 exposures".....just curious

Itchy · #8 15-09-2005, 10:43 PM

This is looking pretty good. What camera have you used?

Cheers

avandonk · #9 16-09-2005, 11:04 AM

Quote:

Originally Posted by Itchy

This is looking pretty good. What camera have you used?

Cheers

Canon 20D 85mm F1.8 at F2.8, with Hutech LPS-P2 LPR filter piggyback unguided on HEQ5.With this lens 3.5 minutes (211sec) exposure gets good detail without saturating the sensor.I've added a crop from the original stack to show the detail even with a focal length of 85mm.I am still learning what is possible with these digital systems.

Itchy · #10 16-09-2005, 04:08 PM

Quote:

Originally Posted by avandonk

Canon 20D 85mm F1.8 at F2.8, with Hutech LPS-P2 LPR filter piggyback unguided on HEQ5.With this lens 3.5 minutes (211sec) exposure gets good detail without saturating the sensor.I've added a crop from the original stack to show the detail even with a focal length of 85mm.I am still learning what is possible with these digital systems.

Thanks. I am assuming that your 20D is unmodified. You asked "where did the red go?".

I asked the same question when I tried to shoot the Tarantula with my 300D. Unmodified cameras seem to miss all of the red on this object. Usually they can pick up a little and you can tease it out with processing. There must simply be not enough Ha there for the unmodified cameras to detect. Having said that I gave it a try anyway. The first link was my first attempt. As you can see No Red!

http://users.bigpond.net.au/itchysas...antulaweb1.jpg

This one is from the same RAW's processed for red emphasis. Not much better really.

http://users.bigpond.net.au/itchysastro/taraLX.jpg

So I think if you want red on this object, then the IR filter needs to come out!

cheers

avandonk · #11 17-09-2005, 02:16 PM

Quote:

Originally Posted by Itchy

So I think if you want red on this object, then the IR filter needs to come out!

cheers

Yes,the sensitivity to H-alpha is down to about 20% to that of green say,on the 20D due to this filter.I have been tempted by the modifications Hutech do to Canons.
http://www.sciencecenter.net/hutech/canon/index.htm

The other way of course is to cheat and take exposures through a H-alpha filter for four to five times the exposure of the normal spectral response of the sensor and superimpose with Registar.

Next thing to try.

Bert