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Usefullness of 7nm H alpha filter in DSLR?

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#1 PABresler

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Posted 19 June 2019 - 01:22 AM

Is this a useful filter in an astromodified DSLR, or only for monochrome use?

 

https://www.ebay.com...qEAAOSwOPxdBXYT

 

I bought one and am wondering what to do with it. It only works in a DSLR.

 

Peter


Edited by PABresler, 19 June 2019 - 01:24 AM.


#2 t_image

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    Gemini

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Posted 19 June 2019 - 02:37 AM

I think you can have fun with it.

Here's a 5 second sub without stacking taken with my Sony a7s and a 10nm filter...

Now imagine if one spent time capturing subs with proper settings and stacking, etc....

North American Nebula neb5secha


#3 PABresler

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Posted 19 June 2019 - 03:00 AM

Looks good...you can easily spiff that some up more with PS.

 

Peter



#4 Samir Kharusi

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Posted 19 June 2019 - 07:28 AM

Should work very well. Here is an example of 90 minutes Integration Time (2 minute subs) at a moderately light polluted site, modded Canon DSLR, f2.8, 200mm lens. Top left using an LPS filter, top right using a 6nm Ha filter, main image combination of the two:

102344043.jpg


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#5 PABresler

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Posted 19 June 2019 - 11:20 AM

Thanks, good to know. I think a 1.25 inch filter may be more versatile though; the seller said he would exchange it.

 

Peter



#6 t_image

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Posted 19 June 2019 - 12:46 PM

Thanks, good to know. I think a 1.25 inch filter may be more versatile though; the seller said he would exchange it.

 

Peter

Do some research on your particular use cases,

as pros/cons may come to light (reflections/vignetting) depending on where filter is located, but also on filter quality, etc....




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