AstronomyUkraine Posted April 7, 2021 Share Posted April 7, 2021 Today I took delivery of the new Antlia 3nm OIII filter. After the positive comments about this filter, I decided to purchase the OIII for the time being, as my Optolong OIII is a disaster on bright stars, causing huge halos. I have few clear nights coming up, so will give the filter a challenge by imaging the Sadr region. Sadr gave me horrendous reflections with my Optolong OIII filter last year. Be interesting to see how they stack up against each other. Brian 1 Quote Link to comment Share on other sites More sharing options...
Wyvern Posted April 7, 2021 Share Posted April 7, 2021 I'd be really interested to see the results of your tests. 1 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 7, 2021 Author Share Posted April 7, 2021 12 minutes ago, Wyvern said: I'd be really interested to see the results of your tests. Me too. I'm expecting a huge improvement, after all, the Antlia is 3 times more expensive than it's Optolong equivalent. Brian Quote Link to comment Share on other sites More sharing options...
Wyvern Posted April 7, 2021 Share Posted April 7, 2021 Quite, I have the 3.5nm ones. Happy to also contribute that data Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 7, 2021 Author Share Posted April 7, 2021 14 minutes ago, Wyvern said: Quite, I have the 3.5nm ones. Happy to also contribute that data How does the 3.5nm cope with reflections? Quote Link to comment Share on other sites More sharing options...
Wyvern Posted April 7, 2021 Share Posted April 7, 2021 I haven't seen any yet really, a bit of bloating maybe on really bright stars. I think the brightest I have imaged are the 2 around the Jellyfish nebula for which you can see the data here Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 7, 2021 Author Share Posted April 7, 2021 3 hours ago, Wyvern said: I haven't seen any yet really, a bit of bloating maybe on really bright stars. I think the brightest I have imaged are the 2 around the Jellyfish nebula for which you can see the data here I will be very happy if this 3nm produces the same results. Here is Sadr taken with my Optolong filter. Not a pretty sight. 1 Quote Link to comment Share on other sites More sharing options...
TerryMcK Posted April 7, 2021 Share Posted April 7, 2021 Interested to see how you get on with the new filter too as I’m interested in them. Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 7, 2021 Author Share Posted April 7, 2021 17 minutes ago, TerryMcK said: Interested to see how you get on with the new filter too as I’m interested in them. Looks like I will get a chance to try it out later. The snow has stopped, and the cloud is breaking up. I can image Sadr from around 2.30 once it clears the trees, so hopefully will post results tomorrow. 1 Quote Link to comment Share on other sites More sharing options...
Carastro Posted April 7, 2021 Share Posted April 7, 2021 I haven't heard of the Antlia filters. I was planning to get the Baader ultranarrowband one at 3nm, I already have the Ha 3.5nm, but since I don't currently have any decent skies to try it on I am sitting on the order. The image Wyvern linked to looks very impressive. I wonder how they compare pricewise to the Baader ones? Have you got a link to the Antlia filters? Carole 1 1 Quote Link to comment Share on other sites More sharing options...
Wyvern Posted April 7, 2021 Share Posted April 7, 2021 These are the ones I use https://www.rothervalleyoptics.co.uk/antlia-oiii-35nm-ultra-narrowband-filter.html These are 3.5nm rather than 3nm. I'd be quite interested in seeing the difference between the two. I'm not convinced that the extra 0.5nm will make an awful lot of difference. Saying that I probably would have gone for them but they are a fairly new addition to the range. Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 7, 2021 Author Share Posted April 7, 2021 47 minutes ago, Carastro said: I haven't heard of the Antlia filters. I was planning to get the Baader ultranarrowband one at 3nm, I already have the Ha 3.5nm, but since I don't currently have any decent skies to try it on I am sitting on the order. The image Wyvern linked to looks very impressive. I wonder how they compare pricewise to the Baader ones? Have you got a link to the Antlia filters? Carole I haven't seen a Baader 3nm ultranarrowband, only the 4.5nm version, and they are around 100 euro cheaper than my Antlia 3nm filter. Brian Quote Link to comment Share on other sites More sharing options...
Carastro Posted April 7, 2021 Share Posted April 7, 2021 You are right, I just remembered incorrectly. 4.5nm. Carole 1 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 7, 2021 Author Share Posted April 7, 2021 6 minutes ago, Carastro said: You are right, I just remembered incorrectly. 4.5nm. Carole Whether the 1.5nm is worth the extra 100 euro is debatable, but I will test the Antlia out tonight and post the result. Brian 1 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 8, 2021 Author Share Posted April 8, 2021 (edited) Took a couple of OIII frames with the Antlia OIII filter. I'm initially impressed, the filter removed a horrible halo around one of the stars near Sadr. There is still a feint halo around Sadr, but that is down to the non AR coating on the ASI 1600, which is a common problem. The top image is from last year, the lower one was taken last night. You will see the highlighted star in the images. Both are 5 minute exposures with no processing. Brian Edited April 8, 2021 by AstronomyUkraine 4 Quote Link to comment Share on other sites More sharing options...
TerryMcK Posted April 8, 2021 Share Posted April 8, 2021 It is a world of difference. I am very impressed. Quote Link to comment Share on other sites More sharing options...
TerryMcK Posted April 8, 2021 Share Posted April 8, 2021 I've just put an order enquiry with Rother Valley. There is also 365 Astronomy who sometimes stock them but that is down to phoning the vendor to see if he can do a deal. Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 8, 2021 Author Share Posted April 8, 2021 24 minutes ago, TerryMcK said: It is a world of difference. I am very impressed. Me too Terry. The image was taken close to dawn as well, so not the ideal conditions to be imaging. Going to take a few shots of the Jellyfish tonight, and see how it copes with Propus. Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 8, 2021 Author Share Posted April 8, 2021 24 minutes ago, TerryMcK said: I've just put an order enquiry with Rother Valley. There is also 365 Astronomy who sometimes stock them but that is down to phoning the vendor to see if he can do a deal. I think the Rother Valley filter is 3.5nm. Is it worth paying 100 euro extra, for the reduction to a 3nm filter? Quote Link to comment Share on other sites More sharing options...
TerryMcK Posted April 8, 2021 Share Posted April 8, 2021 Ahh interesting I missed that bit. Did you order from another supplier? Quote Link to comment Share on other sites More sharing options...
MarkAR Posted April 8, 2021 Share Posted April 8, 2021 (edited) Looks like the Antilia is a huge improvement. Might be worth an experiment sometime if as many people with as many different Oiii filters all take a shot at the same target and compare filters. Edited April 8, 2021 by MarkAR 1 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 8, 2021 Author Share Posted April 8, 2021 3 hours ago, MarkAR said: Looks like the Antilia is a huge improvement. Might be worth an experiment sometime if as many people with as many different Oiii filters all take a shot at the same target and compare filters. I doubt even Astrodon filters will completely stop halos around bright stars such as Sadr and Alnitak, especially if the camera like my ASI1600 already has a built in problem with no AR coating on the sensor. Quote Link to comment Share on other sites More sharing options...
Wyvern Posted April 8, 2021 Share Posted April 8, 2021 6 hours ago, AstronomyUkraine said: Me too Terry. The image was taken close to dawn as well, so not the ideal conditions to be imaging. Going to take a few shots of the Jellyfish tonight, and see how it copes with Propus. Wow, that's quite a difference. Look forward to seeing the jellyfish subs. Would be good to compare to mine. 1 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 8, 2021 Author Share Posted April 8, 2021 2 minutes ago, Wyvern said: Wow, that's quite a difference. Look forward to seeing the jellyfish subs. Would be good to compare to mine. I might be lucky and get a few shots before it disappears behind my trees. Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 8, 2021 Author Share Posted April 8, 2021 I managed to take a 10min image of the Jellyfish with the Antlia OIII before it disappeared. There is a slight halo around Propus, but nothing to worry about. The filter picked up a fair amount of nebulosity though for one light. Brian 3 Quote Link to comment Share on other sites More sharing options...
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