Antlia Pro 50.8 LRGB + Narrowband Filters: Revisited

First light of my QHY600 + Tak 106 with a mixed set of filters

It’s been a few months since I originally posted concerning the new Antlia Pro filters. First off, I want to be give props to folks in the Astronomical Equipment industry for getting me sorted. It took a village, ya’ll! Now, to get caught up… check out my first blog post way back in January! https://space4everybody.com/a-tale-of-two-lrgb-filter-sets/

OPT sold me my QHY-600 camera as a “KIT”. It came with a 7 position filter wheel- and a set of 50.8 unmounted Antlia 3.5mm LRGB + Narrowband filters. Unfortunately, after it was shipped to me and I unboxed the kit, I discovered incorrect LRGB filters and NO Narrowband filters. After a few weeks, OPT took care of me completely and refunded me the price of my filters and a nice discount code I could use later for another purchase. It’s important to remember that these are just people moving equipment around in a supply chain. They have good days and bad days just like you and me. Cut them some slack and check your temper/frustration at the door. In this industry especially, many conversations happen between continents and it’s going to take a day, week, or weeks sometimes to resolve situations completely. Was I frustrated? You bet! Was it anyone’s fault specifically? No, just a packaging mistake. It happens. Did I freak out on anyone? No. Did I complain to my friends. Yes. I vented. I understand, when you spend as much as we do on this endeavor it’s really scary when something is missing or wrong. I wrote an email(s) stating what I would like to reasonably happen. I did make the mistake of communicating in Chat/Phone/Email when I probably should have just kept it to one of those systems so as not to split that conversation and cause everyone confusion- My bad. Eventually, at the end of the day, OPT, (Dustin, Shawna, and Kurt) did what they needed to do- take care of the customer.

Cyclops Optics- The first retailier to have a set of LRGB filters in stock that worked for my system (50mm unmounted) sent me a set from Hong Kong in THREE DAYS – in time for me to install before leaving! My amazing luck saw me receiving a set of filters with an improperly coated 50mm R fitler. Again, no one’s fault other than my bad luck. Robin IMMEDIATELY found out when a replacement could get to him and he shipped one to me in lightning time, arriving the day I had to depart. And with cloudy skies so no way to push it another day for install and test. This meant, my filter saga would have to wait until I returned this summer. Here is a short video showing the incorrect coating on my initial Red filter and the correct coating on the replacement.

Coating difference between faulty R filter


This left me with a set of BAADER filters that I borrowed from my good friend Dennis Sprinkle until I could purchase some of my own. So my system looked like this:

L, G, B- Antlia Pro 50.8 unmounted
R- Baader 50.4 unmounted
Ha, S2, and O3- Baader

Here’s my comparison image to the one shot above. The difference in the two being the top photo is shot in a Bortle 8 zone while this one below was shot in a Bortle 2 zone. Same framing, acquisition time and processing. Just simply displaying so folks don’t think the filter matching caused the above gradients.

Tak 106 with mix matched filters in Marathon under a Bortle 2 sky



Not the ideal system, but EVERYONE was out of stock. In case you weren’t aware, the pandemic has been GREAT for the astronomy/astrophotography industry. Many things are backordered or out of stock simply because of demand. Patience is key these days. It took me almost four months to find complete sets of filters to make my own. I can’ t complain too much though because the above set did allow me to capture two Image Of the Day awards at Astrobin for my Spaghetti Nebula, and my Seagull Nebula.



And so here we are revisiting… I’ve now got the full set of LRGB + Red Replacement filter + Narrowband Antlia Pro 3mm filters, and as promised here are my tests!

Antlia Pro LRGB 3mm Set


Antlia Pro Narrowband Set


Test Equipment Specs:
Telescope: Stellarvue 86mm SVQ scope at f5.4
Camera + FW : QHY 600m + CFW3 to run the tests.


**I’ll add a photo of this setup later**

I decided to test the system at the extreme- straight on Arcturus. At magnitude -0.04 it is the third brightest start in the sky. It’s safe to say, this star will punish any system’s filters. I captured 12 60s LRGB images and stacked (without flats) to reveal any glow or halo that might be present- and I’m happy to report there is none. With the Narrowband I captured 300s exposures and did see some slight halo .

Arcturus- Centered Test

Next, I stacked the LRGB frames into a single image to reveal the star color. I believe this is WAY better than my mix matched set.

Arcturus – 0.8hr integration

Next, I pointed my scope at Antares (magnitude 1.09) to do the same test. Unfortunately clouds rolled in so I didn’t get sets to calibrate and stack, but it’s safe to say the results were good.

Antares Magnitude 1.09

So at the brightest stars- magnitude 1.5 or greater, there is a slight halo. Very similar to the halos you see on my previous 200 panel mosaic with my Astrodons. Definitley NOT a show stopper, but also not the most ideal. While I love pin point stars, having halos on stars greater than 2.0 isn’t a show stopper in my books, but it will add some challenges to some images with a particularly bright star. Again, that’s me. I’m very familiar with halo reduction so not something I’m going to worry about. I pointed the telescope at a common area for narrowband imaging and captured three frames at 1200 seconds (20 minutes) each to see if there were any problems and I’m happy to report there were none. Here’s the image revealing nice separation under a normal starfield:

NGC 7000- Antlia Pro 3nm HA, Antlia Pro 3nm Sii, and Antlia Pro 3nm Oiii pictured above.

Finally, here’s a stack of single images to show the color gained from three 1200s single images presented in the SHO pattern- or the Hubble palette. I really didn’t take much time to present this- just stacking with RGB combination (SHO=RGB) and then doing a histogram transformation.

NGC 700 presented in SHO- The Hubble Palette

I purchased my set of Antlia Pro 3nm Narrowband set from Woodland Hills Camera and Telescope. Again I was met with great service. I will say, it’s nice that Woodland Hills has a reward program that benefits the customer almost immediately with their reward points.


MY THOUGHTS ON THE ANTLIA PRO 3MM LRGB+SHO set:

PROS:
– Incredible Value
– Excellent Star Color
– Parfocal across the set
– Great seperation in the narrowband channels
– No Halos in the LRGB Pro set
– Amazing packaging (superficial I know but the magnetic cases are nice)


CONS:
– Narrowband filters have slight halo on the brightest stars (roughly magnitude 3 and brighter with my stated equipment) YMMV depending on speed and focal length
– Tough to find in stock


I believe these filters to be the best value out there at the moment. Offering parfocal performance and really nice star color + narrowband separation, Antlia is filling a gap that exists in the market at the moment.

I’ve seen other folks post results with these filters being wonderful on the slower scopes so please do some homework to make sure they work for you and your setup.

Feel free to post questions below!

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