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M51 in RGB


Graham

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Had a surprising clear spell tonight.

Still finding out what the RC can do so I decided to try an HA RGB image.

 

HA -- 11 subs at 600 seconds

RGB -- 11 subs each at 300 seconds

 

Things did not quite go to plan.

The HA subs would not stack for some reason.

The RGB subs were horribly over exposed and the focus was a bit soft.

 

I have had to batter this to death to get something half way decent out of the data.

But as part of the learning curve for the new scope I have made some important discoveries for the future.

 

Onward and upward as they say.

 

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Still a great start Graham despite the issues, If you are focusing manually the take advantage of the diffraction spikes on a bright star... you can use them rather like a Bahtinov mask...the spikes will appear double when out of focus.....it might make your life a little easier when focusing.

What camera were you using Cmos or CCD?

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Thanks Peter

Focus issue was the difference between the broad band and narrow band filters, 

I focused using the HA filter, next time I will use the Lum filter instead of he HA.

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1 hour ago, Graham said:

Thanks Peter

Focus issue was the difference between the broad band and narrow band filters, 

I focused using the HA filter, next time I will use the Lum filter instead of he HA.

Ah yes....that explains a lot Graham

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27 minutes ago, Bottletopburly said:

Could you fit an autofocuser to the RC graham 

 

I have an electronic focuser fitted David.

Problem is with the OAG, if I change focus between filters I will defocus my guide star and loose guiding.

I was just going to do Narrow band last night but had a change of mind mid session.

My LRGB filters are parfocal so not an issue..

I might look into fitting an ST 80 as a guide scope , we will see .

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12 hours ago, Peter Shah said:

Still a great start Graham despite the issues, If you are focusing manually the take advantage of the diffraction spikes on a bright star... you can use them rather like a Bahtinov mask...the spikes will appear double when out of focus.....it might make your life a little easier when focusing.

What camera were you using Cmos or CCD?

 

Sorry Peter seem to have missed the second part of your question.

I am using the QSI 683 with the built in OAG

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2 hours ago, Graham said:

 

Sorry Peter seem to have missed the second part of your question.

I am using the QSI 683 with the built in OAG

I was just wondering if you were using a Cmos......

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Not at all Phil.

It is not bad as a starting point with a new scope.

Hopefully I can get the focus better next time.

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2 hours ago, Graham said:

Not at all Phil.

It is not bad as a starting point with a new scope.

Hopefully I can get the focus better next time.

 

I think the truth is that we are all learning and experimenting.

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Just now, Graham said:

We are indeed Phil I am always pushing the boundaries to learn more.

 

Without trumpet-blowing I made great strides last year in what can be done with a 300mm lens. I think all of us here are getting better photos, even when we haven't upgraded our gear.

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You did indeed Phil.

There was a noticeable and steady improvement to your images last year.

Long may it continue 

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