First attempt on Jupiter with my ETX!

Canopus Lim · Post by **Canopus Lim** » Sun Apr 29, 2007 9:35 pm

Nice work Jiahao. Looks like webcam imaging is real good on planets!

Tachyon · Post by **Tachyon** » Mon Apr 30, 2007 1:15 am

The blue hue is due to over processing. That is why I usually stop short of making the image perfectly sharp. It was recommended in one book (Introduction to Astrophotography by Robert Reeves) to adjust the wavelets to what you would like, and then REDUCE it by 50%, for the first 3 levels.

The details are not so obvious, but the picture is more pleasing.

Cheers!

jiahao1986 · Post by **jiahao1986** » Mon Apr 30, 2007 9:15 am

hi Tachyon,

Thanks for your advice! But I'm wondering that is the color fringe so obvious in your guys' computer screens? It's barely detectable in mine...

Jia Hao

yanyewkay · Post by **yanyewkay** » Mon Apr 30, 2007 9:42 am

yah it is. The tiny moon on near the edge is purple-coloured as well.

Post by **weixing** » Mon Apr 30, 2007 10:10 am

Hi,

Thanks for your advice! But I'm wondering that is the color fringe so obvious in your guys' computer screens? It's barely detectable in mine...

Don't worry about it, it's actually not that obvious...

I guess it may be cause by the atmosphere... Jupiter too low or bad seeing.

Anyway, may be you should try image with a UV cut filter and check the result again.

Happy imaging and have a nice day.

Post by **rcj** » Mon Apr 30, 2007 10:11 am

actually, there are very few Maks out there that utilizes two element aspheric corrector, coz it is expensive as well. The ETX is already IMHO quite good for its price value. Another one is Orion's Mak, which seeing the sunspot results through Meng Lee's version, puts this Mak as well amongst the top listing for beginner-intermediate scope purchases. Of course, if you are fine with narrow FOV. Otherwise, get a rich field refractor!

jiahao1986 · Post by **jiahao1986** » Mon Apr 30, 2007 10:21 am

yanyewkay wrote:yah it is. The tiny moon on near the edge is purple-coloured as well.

hah? Ganymede looks perfectly white in my screen and the color fringe is blue and only appears on the lefthand side, but barely visible...

jiahao1986 · Post by **jiahao1986** » Mon Apr 30, 2007 10:23 am

weixing wrote:Hi,
Thanks for your advice! But I'm wondering that is the color fringe so obvious in your guys' computer screens? It's barely detectable in mine...
Don't worry about it, it's actually not that obvious... I guess it may be cause by the atmosphere... Jupiter too low or bad seeing.

Anyway, may be you should try image with a UV cut filter and check the result again.

Happy imaging and have a nice day.

hi weixing,

Jupiter was over 70 degrees high when i captured this image, so it may be caused by UV light as you mentioned. Thanks for the advice!

Jia Hao

Meng Lee · Post by **Meng Lee** » Mon Apr 30, 2007 10:54 am

Hi, you can see my Avatar jupiter pic, its taken with Toucam with UV/IR cut filter with a pure mirror telescope (Dall-Kirkham), you can still see the fringing. (Jupiter was 40 degree high only). So I think most of the fringing is due to atmospheric dispersion and some is due to various forms of CA.

Btw, this is the atmospheric dispersion corrector:

http://www.astrovid.com/products.php?subcat=103

river · Post by **river** » Mon Apr 30, 2007 11:06 am

Hi Meng Lee, do you have a sample? Good??