Lunt CaK module bandwide?

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Wah
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Re: Lunt CaK module bandwide?

Post by Wah »

Most cameras have higher sensitivity on H line than K line, aren't they?


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Re: Lunt CaK module bandwide?

Post by swisswalter »

Hi Wah

I don't think the sensitivity slope is inversed between 393nm and 396nm, ergo the opposite should be the case, if there is a noticable difference at all


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Re: Lunt CaK module bandwide?

Post by thesmiths »

Walter, the sensitivity of my camera (120MM) definitely decreases slightly between H (3968) and K (3934). Not a huge amount, but it is noticeable.
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Re: Lunt CaK module bandwide?

Post by swisswalter »

Hi Douglas

yes you are right and Wah too. I thought just the other way round :oops: . But I do not think that we can make out a difference in the final pic.


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Re: Lunt CaK module bandwide?

Post by marktownley »

I've thrown in another CaK disk in the comparison series of images further up this post, just adds confusion!


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Re: Lunt CaK module bandwide?

Post by swisswalter »

Hi Mark

a fery fine shot with the f/5 gun.


quote
Now, I wonder what focal ratio the Lunt CaK wedge was designed to work at to deliver a filter centred on 393.37nm?
endquote

that is a very good question!


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

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