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Old 31-10-2017, 06:26 PM
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How many filters?

We are unrestricted by time or money and want the best image ever and decide to take many narrow bands ...just how many filters could you use?
Unrestricted by the size of the filter wheel...
alex
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Old 31-10-2017, 07:14 PM
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Alex when i had my FSQ 106Tak i had only one filter and one only which was an 83 mm Hutech Light Pollution Filter which worked beautifully.
I was screwed at the rear of the Tak and The DSLR was behind it, loved it.
Did many long time exposures which some reasonable results i reckon

Leon
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Old 31-10-2017, 08:25 PM
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billdan (Bill)
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Hi Alex,

For your hypothetical filter wheel, you will need LRGB broadband for star colour, the traditional Ha, OIII and SII narowband filters. Plus you could add these exotic filters Neon III, Helium I or II and Argon III.

I have attached a table showing emission line signal strengths for some nebula's, green are those signals greater than SII and yellow for signals less than SII.

Cheers
Bill
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Old 01-11-2017, 07:17 AM
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Quote:
Originally Posted by billdan View Post
Hi Alex,

For your hypothetical filter wheel, you will need LRGB broadband for star colour, the traditional Ha, OIII and SII narowband filters. Plus you could add these exotic filters Neon III, Helium I or II and Argon III.

I have attached a table showing emission line signal strengths for some nebula's, green are those signals greater than SII and yellow for signals less than SII.

Cheers
Bill
Thank you Bill that answers my question perfectly.
alex
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Old 01-11-2017, 07:19 AM
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Quote:
Originally Posted by leon View Post
Alex when i had my FSQ 106Tak i had only one filter and one only which was an 83 mm Hutech Light Pollution Filter which worked beautifully.
I was screwed at the rear of the Tak and The DSLR was behind it, loved it.
Did many long time exposures which some reasonable results i reckon

Leon
Thanks Leon I wonder how my new f5 would go with one because one is as far as I probably will go.
alex
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Old 01-11-2017, 07:43 AM
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I am using this one (L-Pro, with addition to UV-IR_stop from LenOpTec) with my FS-modified Canon 450D.
See here how they perform.
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Old 01-11-2017, 08:21 AM
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I am using this one (L-Pro, with addition to UV-IR_stop from LenOpTec) with my FS-modified Canon 450D.
See here how they perform.
Thank you Bojan
alex
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