Another Sunday - 27 February 2011

[Matt Wastell (Matt)]

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]

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 (Trevor)]

Nice data set Matt, the active region near the limb is very impressive, thanks for the view.

Cheers
Trevor

[Matt Wastell (Matt)]

[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 (Mike)]

Lovely images Matt, I really like the 1st one!

[Shiraz (Ray)]

very nice images Matt - thanks for keeping us up to date with solar stuff. regards Ray

[sheeny (Al)]

Excellent Matt, as usual.

Al.

[Quark (Trevor)]

Originally Posted by Matt Wastell

[QUOTE What f ratio are you at when imaging?
Derek

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]

Very nice set of images Matt

[Matt Wastell (Matt)]

Originally Posted by Quark

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!!!!!!!!

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!