4 replies to this topic

[unimatrix0]

I recently picked this filter up (Svbony SV231) , just knowing that my 102mm doublet has a very harsh chromatic aberration in broadband for being a budget doublet. 

 

I'm quite satisfied what I saw, just knowing how blue those stars would look without the filter, I had several of those a few years ago, from its 80mm brother. 

 

The weather here so far has been totally terrible so I get 1-2 clear nights a month, at top. 

 

Here is just 1 hour 40 minutes on the Rosette - seems like a popular target right now-  I got the famous concentric ring too - a Nikon D5600 feature.  

 

That entire yellow/purple circle around the DSO is related to that, but maybe within a week I will have my DSO camera to arrive so I can lay down my Nikon. 

 

I specifically wanted to use an OSC camera for this, since with a mono, I could sort of edit out if there was any serious CA on the stars. 

 

The color is what i get with spectrophotometric color calibration and the filter itself is sort of like a UV/IR filter. 

 

By the way my avatar is done with the same telescope, except I used the Antlia Triband filter. 

Edited by unimatrix0, 24 March 2025 - 12:31 AM.

[vidrazor]

The color is what i get with spectrophotometric color calibration and the filter itself is sort of like a UV/IR filter.

It's essentially a UV/IR filter with extended blue filtration, so don't use with with a UV/IR.

Nice shot, although I don't understand why your stars have no color. I took the shot below using the 231 on my SVBONY 102 with my Uranus-C. There is still some blue fringing, but it's certainly better tamed. Unfortunately I was only able to grab 45 minute's worth of time in Bortle 7 skies, so the overall shot is, well, what it is.

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[unimatrix0]

It's essentially a UV/IR filter with extended blue filtration, so don't use with with a UV/IR.

Nice shot, although I don't understand why your stars have no color. I took the shot below using the 231 on my SVBONY 102 with my Uranus-C. There is still some blue fringing, but it's certainly better tamed. Unfortunately I was only able to grab 45 minute's worth of time in Bortle 7 skies, so the overall shot is, well, what it is.

The no color may have something to do that I didn't stretch too hard (stretched it separately from the nebula) .  They do have color though,  just have to zoom in. I can see it's not hitting through as usual, I had to extra boost the saturation for everything, its our transparency and seeing that is just not good enough for imaging.





 

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Edited by unimatrix0, 24 March 2025 - 12:43 PM.

[unimatrix0]

This is about 2 hours of 60 second exposures of the Markarian's Chain. 

 

The colors are more boosted, and yeah there is some CA, it's unavoidable I guess, I could easily get rid of it with Photoshop though, but I just wanted to see how it looks without any special tempering, how the filter pulls the break on the blues. 

 

60 seconds / ISO400 with the Nikon D5600 - same setup same night. 

 

Transparency and seeing was terrible- between multiple fronts hitting the East Coast.  This might also explain the lack of colors, I really have to stretch the images to get anything. 

 

I cannot really commit to any DSO and put some hours in, because there are just no hours of clear skies. 

 

Edited by unimatrix0, 24 March 2025 - 12:40 PM.

[vidrazor]

Yeah the filter helps, but it's not a total solution. The forthcoming version 1.4 of Siril will have correction for fringing.

 

At one point I was thinking of experimenting and getting a blue sep filter and shooting a separate pass and grabbing the blue channel and replacing it in the OSC capture. Would double a session time tho.