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Matt Wastell
27-02-2011, 04:00 PM
Hello all,

After a bike ride this morning I was a touch cranky as the clouds began to roll in - I still set up and dodged clouds for several hours and was pleased to capture some images.
The Sun had three active regions and a nice filament that deserved some attention.

Lunt 60 / 2.5 Powermate / DMK31 (1/30 exp, Gain 386 and Gamma 67) and processed in Registax 5 with my usual inverted side by side presentation.

Image 1 - AR 1163 and 1164
Image 2 - AR 1165 (small but growing)
Image 3 - Filament

Thanks for looking!
Derek Klepp
27-02-2011, 04:21 PM
Nice ones Matt been watching them live onscreen and had a good view of the region in white light using a Lunt wedge.My camera seems to induce too many artefacts for good surface shots .What f ratio are you at when imaging?
Derek
Quark
27-02-2011, 04:26 PM
Nice data set Matt, the active region near the limb is very impressive, thanks for the view.

Cheers
Trevor
Matt Wastell
27-02-2011, 04:55 PM
[QUOTE What f ratio are you at when imaging?
Derek[/QUOTE]

Hi Derek,

I have no idea regarding F ratios - someone once told me how to calculate but I have forgotten.

If you know reply and I will do my homework!!!!!!!!
iceman
28-02-2011, 06:00 AM
Lovely images Matt, I really like the 1st one!
Shiraz
28-02-2011, 05:53 PM
very nice images Matt - thanks for keeping us up to date with solar stuff. regards Ray
sheeny
28-02-2011, 06:26 PM
Excellent Matt, as usual.

Al.
Quark
28-02-2011, 06:36 PM
Hi Derek,

I have no idea regarding F ratios - someone once told me how to calculate but I have forgotten.

If you know reply and I will do my homework!!!!!!!![/QUOTE]

Hi Matt,
There is a most helpful article in the Projects & Articles section here on IIS, by Anthony Wesley "How to calculate focal length from plate scale"

http://www.iceinspace.com.au/63-386-0-0-1-0.html

If you do this then by dividing the the calculated focal length by the dia of your aperture you will get the your focal ratio.

Regards
Trevor
Troy
28-02-2011, 09:11 PM
Very nice set of images Matt :)
Matt Wastell
28-02-2011, 09:52 PM
Hi Matt,
There is a most helpful article in the Projects & Articles section here on IIS, by Anthony Wesley "How to calculate focal length from plate scale"

http://www.iceinspace.com.au/63-386-0-0-1-0.html

If you do this then by dividing the the calculated focal length by the dia of your aperture you will get the your focal ratio.

Regards
Trevor[/QUOTE]

Thanks Trevor - my focal ratio is 500mm (focal length) / 60mm (diameter) = 8.33. I do use a 2.5 Powermate too!