Testing the Optolong L-Pro light pollution filter and processing M31 (astrophotography) 

Please consider subscribing to my channel for more videos! Clear skies! 🙂

The post-processing work was the most valuable part of this, I'm so glad I hung on through that. Thanks for sharing.

I'm an 'advanced' beginner with PI - your processing videos are great teaching tools and easy to follow. I take notes and screen shots to help me remember what to do for my own images. Very much appreciated.

Thank you Shawn for your informative videos, been a great help to see you do these routines rather than trying to drag it from a book, very intuitive, again...great work Paul from down under.

As always Shawn a good video with very useful tips and information.

Awesome image. Fantastic video. Thanks Shawn!

Optolong is a fantastic company. Great customer support and promotion too. Very friendly group.

I have this filter and can't wait to shoot this again with my OSC, I've only done it once before with my DSLR, it was seeing this pop up on the back of that camera that got me hooked on this hobby. Pixinsight is on the list too.

Great video Shawn! Enjoyed the processing in Pixinsight too.

I'm also using the L-Pro filter..essential in the city... - Amazing PI tutorial. - VERY helpful. - Thanks Shawn! cs

I used Shawn's technique on this video and I got my best galaxy processing to the day. Thanks for sharing your knowledge.

Great video Shawn! Very informative! :)

Thanks Shaun for sharing how to do a quick process on M31 & your experience on using the Optolong L-Pro filter. Clear Skies My Brother In Astrophotography…

Very interesting video Shawn. Thank you

Very informative video! Many thanks!

Nice review and process!

30:27 mark I almost fell out of my chair!! LOL Nice video, tons of information.

Well done Shawn!

Very interesting to see a bit of your workflow, great video thank you, looks like the L-pro is doing a good job. But to see really how it performs we should have seen an edit or an unedited stack without using the filter

Very informative and great video.I have orderd the Optolong L-Pro filter from China when i saw this video. I use a Baader planetarium neodymium moon skyglow filter under heavy bortel 8 - 9 skies here in Stockholm. In the suburb. I shoot the M31 Andromeda and M45 Pleades with my Celestron Egde 800 HD with Hyperstar V4 at F/1.9 and will compare to the Optolong L-Pro. Hope to achive clearer data to process in pixinsigt. I shoot with a Zwo 294 Pro Cooled. Trying somthing diffrent. *Clear Skies*

Thanks for sharing your knowledge... being a newbie, it really helps.

Excellent!!!!! Quick question does 5 min subs are enough or should i add different subs

Another great video shawn....I use the L Pro on both esprit 80 and rasa8. Still trying to figure out your guidescope mount lol.

Great easily follow'able video, but what was the cause of the thin dark purple stripe running horizontally across the image towards the bottom? It was always there throughout the process.

New Sub here Shawn. You gave me something to aim for... beautiful!. How did you process your subs? did you calibrate the lights with Master darks, flats, & bias?... Is it possible to share your complete process from the start? Cheers

Great video. What processing software is that?

Chuck Ayoub uses the LPro for luminance.

Would you be willing to share your process icons file? I am in the process of building my own based on what works for me, and I am looking to mimic your settings for MLT and MMT. I also am curious at what the differences would be from the defaults for some of the other processes. Thanks a bunch for the informative videos.

Shawn....still using 168C? What type of gain offset bbn is used on this image?

Shawn, please update how many subs, you said 5 min subs for 3.5 hr? So this was only 42 subs? WOW AWESOME, Thank you

I don’t shoot in light polluted skies but I’m interested in this so I can shoot when the moon is out, do you think it would help in that way? I’m not talking full moon or anything but the week before or the week after the new moon are usually like to go out when it’s 25 to 40%

How much was your complete setup, Mount scope, camera, filters

Great video. I'm south of you in Cambridge. Will the Optolong L-Pro work to shoot galaxies in the area with an unmodified DSLR?

Captivating. and awesome edit... Hi, you got another instant subscriber and thank you for the video... Does any of your video mention what computer specs you're using to run Pixinsight ? Thank you...

Great video, Shawn! Learned a lot of new things on Pixinsight processing. Just one question. How do you compare the Optolong L-Pro against the Optolon L-eNhance? I am unfortunately an astrophotographer with a tight budget and cannot afford both of them.

Great video. Have you ever tested a clip-in version of these?

Hi Shawn, I received this filter yesterday. I have an ESPRIT 100ED with ASI1600mm + EFW. what I don´t know is how to insert this filter in my optical train. I can srew it in one of the ASI1600 spacers, but in the other side of the filter I have no thread to attached to the telescope flatner. Is it necessary any other adapter? or I missed something? thanks a lot for your support

What shortcut keys are you using to do the before/after switch? Nice video.

Hi Shawn Would appreciate some advice on processing with LPS filters other than the L-Pro? I used my IDAS LPS V4, which has a much smaller spectrum, on M51 with my OSC 294MC Pro. Would there be big differences in the work flow? I would really like to send you the stacked FIT, if at all possible, and follow your workflow in processing in PI. I took 40 subs @240s @-10C. Please let me know if that’s possible? Many thanks.

new to your channel, and you are doing an amazing job, can you share image info? how long was the exposure?

Great video, is there a way to add the Pro filter to pixnsight before the weighted batch processing?

What did you stack the data in?

Nice video. Thank you. May I ask why you have 3 scopes there? One is the main telescope used for imaging. One at the bottom of it is the auto guider set up. what is the one on the top for?

I bought this and had ridiculous amount of internal reflections on the picture. I eventually had to tape the filter ring to get rid of them :( Perhaps I was just unlucky as it seems to me that everyone else had good results.

I have horrible halos around bright stars. I was shooting 5 min subs then dropped to 3 min. No joy. Any suggestions?

Nice upload 👍new subscriber here 🙌

Shawn (I hope I got that right), I am following your tutorial and I have picked up on A LOT! One thing, at about 18:27 in the video you a do a before and after image. I noticed the mouse didn't move. How did you perform the before/after? Dale

The problem I see here for many astro-imagers is that HP & LP Sodium lamp glow has been replaced by LED lighting which is blue oriented but broad spectrum. This spectrum blocking looks similar to other LP filters such as IDAS which are being sold off by users because they don't block the Blue pollution. Hutech I believe have released an LED blocking filter though I have no details. That said there are many imagers who feel a filter like this improves sky penetration and contrast and my own extended trials that require longer subs are inconclusive. Here is Optolong's Blurb .... Optolong L-Pro (L-Professional) filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution. Optolong L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression.

Hi Shawn, have you been able to compare a shot of M31 without the filter? Would be interesting to assess the value of this filter on broadband targets as these are mostly used in the context of light emission nebulae. Also, can you share the exposure time for your subs that you used? many thanks!

Just curious - how do these perform at blocking out moon light? Have you tested this?

Great video, Shawn! Do you mind sharing some subs files?

How did you turn a green image to a colorful image?

I have this filter it is impossible to get focused any advice would be appreciated

Nice processing. Fancy doing my M31? 😁

Does it block LED light pollution ?

IMPORTANT!! This is Shawn of Visibledark Astrophotography... An FYI for subscribers... my channel was hacked and I'm locked out from admin of it. Cannot upload new videos or edit or don't receive emails for new comments. I am not getting any help from RU-vid currently. They don't seem to have any support in place to help. So I'm not sure what I can do or what to do but I wanted to let folks know. I may have to start over sadly. :(

30:27 lmao in your face outro