my first hbeta with open slit

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highfnum
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my first hbeta with open slit

Post by highfnum »

here is regular filter Ha to show what I'm trying to lock on
Capture 2022-07-03T12_24_40a66pqrk.jpg
Capture 2022-07-03T12_24_40a66pqrk.jpg (170.61 KiB) Viewed 1523 times
hbeta
Hbeta070322slt.jpg
Hbeta070322slt.jpg (185.08 KiB) Viewed 1523 times
Hbeta070322vlt.jpg
Hbeta070322vlt.jpg (148.79 KiB) Viewed 1523 times
HeD3
heD3070322vslt.jpg
heD3070322vslt.jpg (180.3 KiB) Viewed 1523 times


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Re: my first hbeta with open slit

Post by p_zetner »

The H beta looks good and it’s great to see the HeD3.


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Re: my first hbeta with open slit

Post by Montana »

Wow!! that is really great :bow :hamster:

Alexandra


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Re: my first hbeta with open slit

Post by ChrisHalpha2017 »

this is not bad at all :

Could you send me a shematic of your spectroscope ? I think i could look at it and help you to improve it ( if you are interested of course .)


spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
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Re: my first hbeta with open slit

Post by highfnum »

its classic design
60mm X 700mm scope
50mm X 200mm collimator
1200lpmm grating.
50mm X 300mm imaging scope

and..

slit is reworked surplus shed


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Re: my first hbeta with open slit

Post by ChrisHalpha2017 »

hmmmm ,

i wouldnt use a 50mm diam 300 mm imaging lens : it means you have a factor k= 1.5x ; that means the final image will be bigger but fainter (less light) . That could explain loss of contrast and loss of sharpness a bit. and it'll limit the range of eyepieces you can use if you want to watch live.

f/D=12 isnt bad :) what camera are you using? have you calculated your sampling rate ? I can do it for you if you give me the camera brand model (i'll will find the pixel size). I wonder if you're not oversampling your prominences image ..

and with some thinking i would even say that a pair of binoculars objectives lens (30 mm diam 135mm f) could be much better : you might gain more light. What size grating do you have ?


spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
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Re: my first hbeta with open slit

Post by highfnum »

I can u a shorter 50mmX200MM F4 imaging scope
I thought bigger was better

i use either zwo asi290mm or asi178mm


grating is 1200lpmm 35mmX35mm


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