Jump to content


The Sun White Light 17 June 2012 (dSLR + Telezoom).


Recommended Posts

Hi all,

Finally a gap through the clouds!

Took this picture 10 minutes ago with my Nikon D3100 and a Sigma 70-300mm telezoom lens.

Baader Solar Filter, 300 mm at ISO 100 F/30; Raw edited and converted to JPEG using Adobe Lightroom.

Click to Enlarge:


Link to comment
Share on other sites

Thanks for the comments. My first attempts, few months ago, were made using a cheap welding glass and a bridge camera. Even cheaper! :) Here is the pic: http://www.flickr.co.../in/photostream

Although proper equipment will give a better experience, one doesn't need to spend much money to enjoy our universe and its natural events. :)

All I need now is a chance to practice with my relatively new Skywatcher 200P.

And, after saving up some cash, I will purchase a Lunt LS35 or a Coronado PST to start some proper solar observing / imaging.

Clear Skies !

Link to comment
Share on other sites

Looks like you've got the Solar bug. Good man!

:D I had a hint of that bug when I was about 9 or 10, when I purchased my newtonian reflector and a mylar solar filter. It was a small fortune back then. I had several observing sessions with that equipement, but after a while the bug went away since it was a pretty quiet period and couldn't see any kind of detail in the sun - not even a small sunspot. Until I did that welding glass experiment and imaged the Sunspot AR 1339 - then I realized that it was actually possible to see some details and whenever I have a chance I grab my DSLR and Telezoom and start shooting our nearest star :) (I'm unable to quickly grab the 200P and the Eq5 telescope :p) And every single time I feel that it's not enough and I could get more....

But one day the H-Alpha telescope will be mine.

By the way, any suggestion about CaK imaging? Is it worth it, what should I buy to start with?


Link to comment
Share on other sites

I would love to do some CaK imaging but the funds won't stretch that far yet. I know that you can get a CaK type PST and Lunt make CaK modules.

Maybe sheri can point you in the right direction.

That's some lovely collection of different wavelengths :)

I thought that CaK would be cheaper then H-Alpha - i.e. Baader + some £ 200 eyepiece mounted filter.

I even found an american reseller who sells CaK filters for about $ 35 - unmounted, so they need to be fitted into

a 1.25" filter ring... but still I have no idea of how all this thing works, it should be all much more straightforward and cheaper then H-Alpha anyway : ) hopefully some more experienced people will mentor us on this :p

  • Like 1
Link to comment
Share on other sites

Be careful with CaK, yes it is OK to buy the Baader filter or the even cheaper version mentioned to add to a white light set up, however..... the filter width is very broad and the most you will see is a white light image with a hint of faculae around the active region. You will not see the super granulation or the diverse features seen with a good narrowband CaK filter like that from Lunt or the discontinued CaK PST. Like with Hydrogen alpha, good narrowband comes with a price.


  • Like 1
Link to comment
Share on other sites

The Baader CaK 1.25" is quite good although not quite as tight of passband as the PST CaK. It certainly gives you the CaK activity used with a 'normal' scope so inexpensive and worth it to see if you want to invest more. For example: http://www.flickr.com/photos/sherikarl/sets/72157630224160418/ The full disk was taken with the PST CaK and the portion of the disk was taken with the Baader CaK 1.25" filter and Baader ND 5.0 filter film on a 110mm refractor.

Hopefully this illustrates a bit about the difference in detail resolution you can get. I've not had a chance to try the Lunt CaK diagonal although the images I've seen on SGL look very good.



  • Like 2
Link to comment
Share on other sites

I take the chance to make a few other questions.

- Did anyone try the Thousands Oaks solar filters? Is there any appreciable difference between them and the more popular Baader white light filters ?

- Are there available for us common humans other interesting wavelengths / filters to observe / image sun details?

- What is a good EU reseller of CaK and other sun imaging filters and equipment?

Thank you all for your consideration and time :)

Clear Skies


Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.