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Transit of Mercury in the Spicule Layer. Phil took this great image with his Quantum 6 Scope, Solar Spectrum etalon and PGR Camera.

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12" White light Newtonian

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AndiesHandyHandies
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12" White light Newtonian

Post by AndiesHandyHandies » Thu Oct 24, 2019 8:09 am

Hi

I now can use some bits for a 12" dobsonian.
I lent the mirror to someone and they cleaned it without asking and took half the aluminium off!
'Home' aluminised at my first club and some pre-cleaning artefact in the coating it looked like.

So might as well take it all off.

Whats the best narrow band filter (s) to use?

Rod points out he used a 10" Newtonian for solar projection for hours with no issues.

Andrew

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MalVeauX
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Re: 12" White light Newtonian

Post by MalVeauX » Sat Oct 26, 2019 2:06 am

Heya,

Well, use a 656nm (Astronomik HA 12nm) filter for poor seeing.
Use a 395nm or 430nm (Andover or Edmund Optics) for higher angular resolution with very good seeing.

Very best,

AndiesHandyHandies
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Re: 12" White light Newtonian

Post by AndiesHandyHandies » Sat Oct 26, 2019 7:45 am

Thanks.

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Re: 12" White light Newtonian

Post by bart1805 » Sat Oct 26, 2019 8:20 am

Don't forget to de-aluminise the secondary mirror!

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Re: 12" White light Newtonian

Post by marktownley » Sat Oct 26, 2019 10:58 am

bart1805 wrote:
Sat Oct 26, 2019 8:20 am
Don't forget to de-aluminise the secondary mirror!
Depends how much light you want coming through 😉
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Re: 12" White light Newtonian

Post by bart1805 » Sat Oct 26, 2019 11:23 am

marktownley wrote:
Sat Oct 26, 2019 10:58 am
bart1805 wrote:
Sat Oct 26, 2019 8:20 am
Don't forget to de-aluminise the secondary mirror!
Depends how much light you want coming through 😉
Yep, you are absolutely right!

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Re: 12" White light Newtonian

Post by allhoest » Sun Dec 01, 2019 4:40 pm

"Don't forget to de-aluminise the secondary mirror!"

If you do so, you will have a very strong filtering.
Maybe you want it that way, but keep in mind that you will have to collimate it!

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