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Costas Soler

1.25" filters v 2" filters help!?

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Hi!

I am looking for a couple of filters to use as a version of a Hubble palette on my imaging setup (8" Orion Newtonian Astrograph, Orion Atlas GEM, Orion SSAG, Nikon D3200, and Baader MPCCII). I plan on getting a Hydrogen alpha filter, an oxygen 3 filter, and a sulfur 2. I plan on getting a ccd soon, I know a dedicated sensor array is going to turn out much better results, but first I want to milk every drop out of my nikon. Now, the coma corrector I use with the nikon only accepts two inch filters, unless I were to add an adapter that holds a 1.25 inch filter, such as the blue fireball 2" filter male thread to 1.25" female thread adapter found here: http://agenaastro.com/blue-fireball-m48-male-m28-5-female-adapter-m-01.html . My main question is, will a filter setup like this impede the amount of light reaching the sensor? I would like to buy Orion's 1.25 filter set [ http://www.telescope.com/Orion-125-Extra-Narrowband-Tri-color-CCD-Filter-Set/p/24609.uts ] 1.) because it contains all three of my choices, and 2.) because I know that the 1.25' filters can fit on any imager or telescope to which I currently have access. Let me know if this seems like a decent plan. Thanks a lot!

Costas Soler

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2 inch are essential with a DSLR sized sensor. The SII is a waist of money on a DSLR. Don't get filters that are too narrow either or you will have one heck of a time with focusing. 

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Adam J: Could you explain why SII is a waste of money on a DSLR? And is there a way you know of to use 2" filters on a ccd array?

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13 minutes ago, Costas Soler said:

Adam J: Could you explain why SII is a waste of money on a DSLR? And is there a way you know of to use 2" filters on a ccd array?

Its just a very week signal in the first place and the red pixel filter has poor transmission as it is even longer wavelength than HII. You might get it to work with a very bright target....I think you can get something out of the Rosetta nebula and the flame nebula but to be honest its not worth the money you would have to pay for it. I dont know about how to test 1.25 inch with a CCD sensor vs 2 inch. I just know that the distance between the sensor and the filter means that you definitely need a 2 inch on a APS-C sized DSLR sensor. The only other way is a clip filter as those are mounted much closer tot he sensor.

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never used a ccd myself but i would say that if its sub aps-c sized and mono it would work great.

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