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Old 14-08-2020, 07:44 AM
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codemonkey (Lee)
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Astronomik vs Antlia halos, a quick comparison

First off, this is not a fair comparison. I'm really only trying to demonstrate the difference in halos. These images are both stacks of 8x300s subs, but they were taken on different nights, under different moon phases, with different seeing conditions. Don't try to make any judgements regarding SNR.

That said, this compares the halos of the Astronomik 6nm OIII with the Antlia 3.5nm OIII. The images were linear fit and then the same stretch applied to both.
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Old 14-08-2020, 08:40 AM
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Atmos (Colin)
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Thanks for that Lee, I’m considering some 2” filters at the moment and Antlia has me intrigued as they’re half the price of comparable Chroma.
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Old 14-08-2020, 10:33 AM
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No probs mate, hope that helps.

I should also mention that I haven't noticed any halos on the S or H filters for either Antlia nor Astronomik.
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Old 14-08-2020, 12:22 PM
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Camelopardalis (Dunk)
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Thanks for that Lee you’ve saved my window-shopping alter-ego a fortune
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Old 14-08-2020, 01:20 PM
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To my (untrained) eye the Antlia result looks worse than the Astronomik. But the Antlia costs more, right?
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Old 14-08-2020, 02:28 PM
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codemonkey (Lee)
Lee "Wormsy" Borsboom

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Quote:
Originally Posted by Camelopardalis View Post
Thanks for that Lee you’ve saved my window-shopping alter-ego a fortune
lol no probs Dunk :-)

Quote:
Originally Posted by Craig_ View Post
To my (untrained) eye the Antlia result looks worse than the Astronomik. But the Antlia costs more, right?
Yep, I think that's a fair assessment. They're both pretty comparable in price. Right now OPT is selling the Antlia for $209USD and the Astronomik for $199.95USD marked down from $229USD.
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Old 14-08-2020, 02:36 PM
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Quote:
Originally Posted by codemonkey View Post



Yep, I think that's a fair assessment. They're both pretty comparable in price. Right now OPT is selling the Antlia for $209USD and the Astronomik for $199.95USD marked down from $229USD.
Ah right, for some reason I thought Antlia was priced quite a bit higher. I guess in that case one must choose between the narrower bandpass and the bigger halos?
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Old 14-08-2020, 02:51 PM
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Lee "Wormsy" Borsboom

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Ah right, for some reason I thought Antlia was priced quite a bit higher. I guess in that case one must choose between the narrower bandpass and the bigger halos?
Yep, that's it. For me, there's another factor as well... I have Astrodon LRGB, and they're 3mm thick. Antlia are 2mm thick, Astronomik 1mm thick. Those differences shift the focus point of the imaging camera when I change between the filters. I use an OAG, which for obvious reasons is in front of the filter wheel, so this basically meant that I couldn't do LRGB and NB in the same night in an automated imaging run because the guide stars would go too out of focus. The Antlia and Astrodon are close enough that I can position the guide camera mid-way between best focus for the LRGB and NB filters and still get reasonable guide stars for both... so for me, the Antlia is still the winner, but I'll probably replace the O with an Astrodon at some point.
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Old 14-08-2020, 03:24 PM
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One of the other differences between Astrodon/Chroma is transmission. It's not a lot of difference but Antlia quotes 88% which Astrodon and Chroma quote around the 98% mark. I've got 3nm Astrodons and never seen a halo even with some really bright stars in field but you do pay for that.

For the price the Antlia filters are very good which is what had me considering them in the first place.
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Old 14-08-2020, 03:30 PM
matlud (Mathew)
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Antila are working on a new version of the OIII filter with apparently reduced halos. Last I heard it was in testing before retail release.
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Old 15-08-2020, 08:09 AM
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Lee "Wormsy" Borsboom

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Quote:
Originally Posted by Atmos View Post
One of the other differences between Astrodon/Chroma is transmission. It's not a lot of difference but Antlia quotes 88% which Astrodon and Chroma quote around the 98% mark. I've got 3nm Astrodons and never seen a halo even with some really bright stars in field but you do pay for that.

For the price the Antlia filters are very good which is what had me considering them in the first place.
Yep, that's a good point. Initially I saw "90%+" for Astrodon, and "typically 88%" for the Antlia, which sounded pretty close. Apparently the "90%+" for the Astrodon's is the old spec though, so there's more of a difference than I first thought.

I did the math based off the (very coarse) graphs provided with my Antlia filters and came up with the following:

SII: 93% transmission, FWHM 3.91nm
OIII: 88% transmission, FWHM 3.75nm
Ha: 91% transmission, FWHM 3.59nm

Quote:
Originally Posted by matlud View Post
Antila are working on a new version of the OIII filter with apparently reduced halos. Last I heard it was in testing before retail release.
I hope they offer trade-ins!
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