PST + QHY5L-II

[Stu_2011]

Hi

First attempt at taking a full disk solar image with this combination. The QHY5L-II is attractive because it has a 1.25" body and therefore it can fit inside the PST eyepiece tube and get to focus. My DMK camera wouldn't come to focus even with a short extension and I didn't want to start chopping up my PST. I bought the QHY5L-II as a guide camera so was worth a try.

The image obviously has some Newton rings but I reckon a de focused flat image stands a good chance of removing these rings, they are quite widely spaced which will help with removal. The underlying detail is quite good I feel so I'm happy.

1500 frames at 15 FPS, stacked in Registax.

Thanks

Stuart

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[Merlin66]

Looks good!

I think the potential is certainly there.....

Well done.

[Stu_2011]

Looks good!

I think the potential is certainly there.....

Well done.

Thanks, I read these forums a bit so I know that you know your stuff when it comes to solar imaging.

Do you think a de focused flat will help remove the Newton rings?

Stuart

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[Merlin66]

Newton Rings are a PITA!

Yes, a flat may help, also try a "bag flat" - normal focus but place a white plastic bag over the objective, expose long enough to get a good histogram and see how you go...

[DrRobin]

That looks really good Stu. Flats will help reduce the bands produced by the rings, the other trick is to let the image drift around a bit, it averages out the dark bands.

Robin

[Montana]

An excellent image, I agree with the advice above :)

Alexandra

[Stu_2011]

Hi again

Attempt number 2 at the weekend. Getting better! I will try the de focused camera / bag flat next tim. In this case I adjusted the elaton / focus / camera position to minimise the Newton Rings.

Thanks

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[Adrena1in]

This gives me real hope.  I recently acquired a PST and would love to take photos though it, though I'm having a job deciding which camera to start with.  Tried my DSLR, but the results have been pretty rubbish.  Have considered the QHY5L, as they're not too pricey, and your images have made up my mind.  

Can I ask though, is it the mono camera, and you've added false colour afterwards, or is it the colour camera?

Thanks,

Tim.

[Merlin66]

Mono is definitely the way to go for maximum resolution.

In post processing you can have any colour you want ;-)

[Pete Presland]

excellent start some very nice surface detail showing.