Picture of big,big sunspot

Post by **Airconvent** » Thu Oct 23, 2003 1:23 am

ahh..so that is what remus is up to these days...looking at the sun instead...what an interesting way to tide over the cloudy skies these days!

nice pic. care to share how you did this?
as a kid, I was told either to use a piece of car board, make a tiny hole and see the projection on the floor or to make a pin hole camera...

S&T actually features a shop that sells a contraption that looks like a foldable sun deck chair but is in fact a sun projection system.

Back to your pic, notice the lack of sunspots (most solar pics would be littered with them). That's because they increase and decrease in 11 year cycles and currently, it is well on the decline phase...

rich

Terry · Post by **Terry** » Thu Oct 23, 2003 9:34 pm

News: http://www.space.com/scienceastronomy/s ... 31023.html

Post by **Airconvent** » Fri Oct 24, 2003 1:02 am

antares2063 wrote:Hi Richard!
I just used solar projection using a normal 20 mm plossl, projected the image up at the ceiling, turned the focuser to focus it, and thats it.( I was observing inside my house not outside...heh)
Junwei

Hi Mate,
I'm not too sure what you mean by Solar projection on the ceiling...I thought it would be on the floor? Can you elaborate?
Enjoy your stay down under....and give my regards to Kylie....

rich

Post by **Airconvent** » Sat Oct 25, 2003 12:39 am

antares2063 wrote:Oh! my projection is towards the ceiling cos I turned my OTA in such a way that the eyepiece is pointing upwards. Basically the projection will be wherever the eyepiece is pointing to.
Junwei

oh...you mean you point your OTA towards the sun and capture the image through the eyepiece's projection on the ceiling? Do you use any protection?
Else I think the direct sunlight will damage your Newts' mirror coating?
cheers

rich

elton · Post by **elton** » Sun Oct 26, 2003 1:47 am

careful when using a plossl. the plossl design has cemented elements like most other designs and can be damaged at high heat. The best for projection are the cheap 3 element huygiens which have no cemented elements. Mostly we quickly upgrade and dump these "junk" eyepieces .. now they come in useful.

Grievous · Post by **Grievous** » Fri Oct 31, 2003 3:01 pm

Hi all, currently at RP with Sam from SP to help out RP with their signup booth. Just did a solar observation, and took some pictures, here they are.

Enjoy!
Charlie