The Sun - 16th Jun 2013

[David Smith]

Finally a brief gap in the clouds. Managed to rattle off a couple of hundred but more than half were cloud affected. Still at least the wind has dropped today. Stacked 55 in the end, from the 80 I fed into R5.1) and am reasonably pleased with the result.

Last couple of days (with spots on either side of the Suns' disk) it has been very obvious that the focus point for the two limbs is different through my scope. Do others find this? I can get around this by shooting two runs at different focus points and then combining them (didn't have time today). I had suspected this before and this does help to explain the lack of clarity in the faculae at the limbs on my shots.

20130616 by David_The_Bears_Fan, on Flickr

And a crop of the new group

20130616_Crop by David_The_Bears_Fan, on Flickr

[Steve Ward]

Nice gap catching ...

If there's a marked difference in focus from one side to the other I suspect somethings not sitting square , ie the chip is tilted to the focal plane somehow , slop in the focuser tube maybe ?

[Bizibilder]

As above - something isn't square (or straight) hence the difference in focus. otherwisw good capture and close-up.

[David Smith]

Thanks chaps. Probably my hurrying to capture during a gap and not making sure the T adaptor is sqaure in the focuser. There is quite a bit of focuser slop as I rack in and out anyway so could just be that I suppose. Something else to remember when I am presented with a few minutes gap.

[Steve Ward]

You should be able to adjust out the slop in the focuser , or failing that add some self adhesive thin teflon strips to the drawtube for a better fit.

[David Smith]

Yes, had a couple of goes at that, including adding the teflon strips. Will revisit at some point as it clearly hasn't had the desired effect.

[Montana]

A very fine full disc

Yes it is a pity the right hand side isn't the same as the left, but I am sure you will get it sorted soon.

Alexandra

[michael.h.f.wilkinson]

Very crisp, lovely detail in those ARs