Remote imaging versus hands-on astrophotography: the debate continues

Tony GondolaRainer EhlertSonnyEArun HSalvatore Iovene
155 replies4k views
Salvatore Iovene avatar

Bortle scale is a bit complicated, because it could vary from session to session. I'm not sure what the best compromise is:

  • Current: it's a bit buried, in the sessions “additional properties” so many people don't fill it

  • Making it mandatory per session and promoting it to the row of fields that are immediately available

  • Making it mandatory but per image (this disregards multi-location acquisitions, or revisions that might be different)

  • Having an estimated one extracted from the location (many images have one)

All of these have drawbacks. I welcome suggestions!

Helpful Insightful Respectful Engaging
Gene avatar

I started out imaging from my home in San Diego (coastal southern California). I soon learned that I was actually able to use my equipment only a few times a month due to weather and sky quality. This often resulted in often only 6 to 12 hours of integration time on a target and a lot of down time for the equipment.

With a few equipment additions I had a portable refractor rig that allowed me to travel to the eastern part of the county where the sky quality is much better, and I would also join others at popular dark sites. The face-to-face socializing was really enjoyable. The only limitation being how long I could stay at these dark sites with my rig. The issue was that with work/family obligations I was still constrained to 15 or so hours of integration time before I had to breakdown the rig and head home.

Mid 2024 I realized my home based (not portable) rig was not getting much use, and I saw the increase in popularity of the remotely hosted sites. Because I really wanted to use my home-based rig in worthwhile conditions, so I decided to take it to HCRO in NM where it could get a lot more use than at my home. This turned out to be a great (but expensive) move. The huge increase in the use of this equipment in pristine sky conditions justified the cost (IMHO). The social aspect of being part of the HCRO community is wonderful, but its not the same as being at a dark site with others. However, I do enjoy going to HCRO a couple times a year (Greg is a great host).

I decided to keep my portable rig because it is a lot of fun to join others at dark sites, setting up equipment, trouble shooting, and imaging. My expectations are now more realistic with the acknowledgement that being out under the stars with other amateur astronomers is really half the fun. I leave it to my equipment at HCRO to fulfill my need to get really incredible images.

Helpful Insightful Respectful Engaging
Tony Gondola avatar

Jim Bishop · Jan 29, 2026, 04:00 PM

Carastro · Jan 29, 2026, 12:15 PM

Personally I would not feel content to simply process data I did not capture as I could never call it my own image.  (Except in a processing challenge when it is obvious it is not my own image).  

I use a remote system. A friend and I put the system on the pier. We added all the attachments. We polar aligned. We set up the remote access. We set up the remote shares and syncing data to move the information each night. We integrated it into Discord. We built the NINA sequence that runs each night. We pick targets and framing. We build the mosaics. We do everything the backyard astronomer does, we just leave our system setup each night. If you consider a backyard person who is lucky enough to have their own dome/observatory, my remote system is no different except it happens to be hours away by plane.

I wish I had better skies than B7+. I wish my backyard had a astrophotographically usable view of the sky. I wish I had a roll off roof observatory I could set my equipment in. But I don’t. That doesn’t mean I am not capturing my data. I am sure most remote enabled people are in the same camp.

One thing most non-remote people don’t consider is the relentless pressure to keep the system running. When you have 200+ nights a year clear sky “what’s next” is a constant question. When you’re renting the pier, time literally is money. I try to stay 3 months ahead in case something comes up.

Just my opinion but being under “relentless pressure” and counting time as money just doesn’t sound like much fun…

Tony Gondola avatar

Salvatore Iovene · Jan 29, 2026, 05:10 PM

Making it mandatory per session and promoting it to the row of fields that are immediately available

This would be my choice. Anything more complicated can be covered in the comment section.

Well Written
Jim Bishop avatar

Craig Towell · Jan 29, 2026, 04:52 PM

Jim Bishop · Jan 29, 2026 at 04:00 PM

One thing most non-remote people don’t consider is the relentless pressure to keep the system running. When you have 200+ nights a year clear sky “what’s next” is a constant question. When you’re renting the pier, time literally is money

Forgive me for not being overly sympathetic with you on this!

Not really looking for sympathy. It is a good “problem” to have. It was the thing that surprised me the most when going remote. After working through all the other issues, I thought I had it all figured out. Then I started picking and populating targets. What took me weeks / months at home was taking me hours / weeks remote. I had picked targets I thought would take a month to complete and they were finishing in a couple of days.

What I would absolutely love (and still can’t figure out) is a mathematical way to say “this is the theoretical best image I can produce” and then be able to measure against it. My partner’s response to finishing something up is always “lets get more of the same”. My response is always “when is enough, enough”.

When it comes to astrophotography, everything is a first-world problem :)

Engaging
Jim Bishop avatar

Tony Gondola · Jan 29, 2026, 05:16 PM

Just my opinion but being under “relentless pressure” and counting time as money just doesn’t sound like much fun…

Sometimes, I completely agree with you.

Carastro avatar
Just to clarify, if imagers have gone to the trouble of setting up a remote system themselves, imo it is still their data.  

It is processing data that can simply be purchased that I could not accept as my own image.  Especially as lots of people will be using that same data.  

I wish I had the skills (and money) to set up a remote system.  

Carole
Arun H avatar
Speaking of relentless pressure- even at my cloudy site, I’d find myself under pressure to image something if the skies were clear. Or travel to my local dark sky site. That takes away from the fun. This is a hobby not an obsession. So now, I  much more relaxed and will only image something I am excited to image and put family and work first.
Rainer Ehlert avatar

Salvatore Iovene · Jan 29, 2026, 05:10 PM

Bortle scale is a bit complicated, because it could vary from session to session. I'm not sure what the best compromise is:

  • Current: it's a bit buried, in the sessions “additional properties” so many people don't fill it

  • Making it mandatory per session and promoting it to the row of fields that are immediately available

  • Making it mandatory but per image (this disregards multi-location acquisitions, or revisions that might be different)

  • Having an estimated one extracted from the location (many images have one)

All of these have drawbacks. I welcome suggestions!

Hi Salvatore,

Yes “Bortle scale is a bit complicated, because it could vary from session to session.”

Why not use as a compromise the website values lightpollutionmap.info which are there when one chooses the World Atlas 2015 values. There is a Bortle value when one clicks on the location where one is. Nice, it tells me I am in Bortle 5 and so I will keep imaging 👍️

📷 image.pngimage.png

On the other hand there is also the VIIRS YYYY which gives as values as nW/cm2*sr which would need to be converted to Bortle X

📷 image.pngimage.pngI made a search with my value and got this as answer by AI 🤣 and after that I decided to sell my astro equipment 🤣🤣🤣

📷 image.pngimage.pngThen I made anther search asking how to convert Radiance (nW/cm2* sr\) and AI gave me the following

📷 image.pngimage.pngSo summing up we could use this values as a guideline and I guess most of us agree that this then would be a global standard.

IMHO and if not, we can shoot lightpollutionmap.info up to the Moon 💫

Rainer Ehlert avatar

Arun H · Jan 29, 2026, 06:06 PM

Speaking of relentless pressure- even at my cloudy site, I’d find myself under pressure to image something if the skies were clear. Or travel to my local dark sky site. That takes away from the fun. This is a hobby not an obsession. So now, I  much more relaxed and will only image something I am excited to image and put family and work first.

I agree, from time to time I just leave the equipment where it is and take a rest when astronomy starts to get stressy and assemble a puzzle for having fun… then when puzzling get stressy I go back to astronomy 👍️

Urmas Leming avatar

+1 . My thoughts are exactly same. Shouln’t be very difficult to add for exaple @ Data source section.

Vin avatar

I wonder if putting a Bortle number would work? I’ve just set up all my own kit at a new remote obs in South Africa (just a little TV76 on an unguided HEQ5). The skies are amazing. On a moonless night, the SQM clocks over 21.7/21.8 regularly - when the moon is up and blazing that drops to 18.5 or below. What Bortle scale would I put…and if I didn’t have an SQM then what…?

I think it already is mandatory to say whether an image is Backyard or Traveller etc - it should be mandatory to also specify Remote (apologies if it already is). And then folks can just factor that in when looking at an image as that tag will give a good proxy for the kind of conditions that image was taken in?

(PS - the crazy thing about LP is that in my Bortle 9 inner city location, the best SQM I’ve ever got was just over 18 - that really puts into perspective the LP issues that Backyarders have to deal with: when a full moon in a dark sky is still not as bright as your LP…this is why I completely agree that there is more skill and determination involved in the images that folks extract from their Backyards - the 3 feet wide CDKPlanewave scopes on the top of Aconcagua/Everest/Uhuru/near earth orbit are basically a financial arms race but that’s a well worn argument that is not worth re-opening)

Helpful Insightful Respectful Engaging
Rainer Ehlert avatar

Vin · Feb 2, 2026, 01:45 PM

What Bortle scale would I put…and if I didn’t have an SQM then what…?

I guess this has not yet been decided by Salvatore and so you can put the Bortle scale you thnk you really have but if it not yet mandatory you can also leave it free. IMHO

Salvatore Iovene avatar

Rainer Ehlert · Feb 2, 2026, 03:25 PM

I guess this has not yet been decided by Salvatore

I suppose that a Bortle Scale value is after all an estimation, and it doesn't need to be measured by an SQM. You could simply go by the descriptions of what it scale value represents.

Please note that this can already be added to AstroBin, for each acquisition session. The problem is that it's a bit buried (behind an “Additional property” dialog.

What I plan to do:

  • Make it a first class citizen (the field should fit with some creativity)

  • When missing, show an “Estimated Bortle Scale” based on location (where available)

I'll plan this for the close future (it's not terribly complex).

Helpful
Tony Gondola avatar

Salvatore Iovene · Feb 2, 2026, 03:28 PM

Rainer Ehlert · Feb 2, 2026, 03:25 PM

I guess this has not yet been decided by Salvatore

I suppose that a Bortle Scale value is after all an estimation, and it doesn't need to be measured by an SQM. You could simply go by the descriptions of what it scale value represents.

Please note that this can already be added to AstroBin, for each acquisition session. The problem is that it's a bit buried (behind an “Additional property” dialog.

What I plan to do:

  • Make it a first class citizen (the field should fit with some creativity)

  • When missing, show an “Estimated Bortle Scale” based on location (where available)

I'll plan this for the close future (it's not terribly complex).

That’s a great plan

Bob Lockwood avatar
Salvatore Iovene:
When missing, show an “Estimated Bortle Scale” based on location (where available)


Hi Salvatore,

I'm not sure adding an 'Estimated Bortle Scale' is really fair since it doesn't know the actual conditions for the location. As an example, if I don't put in a Bortle number, it will state I'm in a Bortle 4-4.5. That's just not correct as I measure on average 21.3 depending on what chart you look at and being about 40 miles east of San Diego and if a thick marine layer comes in, it could go down to a good Bortle 2.
Salvatore Iovene avatar

Bob Lockwood · Feb 2, 2026, 05:26 PM

I'm not sure adding an 'Estimated Bortle Scale' is really fair since it doesn't know the actual conditions for the location. As an example, if I don't put in a Bortle number, it will state I'm in a Bortle 4-4.5. That's just not correct as I measure on average 21.3 depending on what chart you look at and being about 40 miles east of San Diego and if a thick marine layer comes in, it could go down to a good Bortle 2.

I understand that. We need to understand what compromise we prefer:

  • Clearly labeled “estimated” Bortle scale that might be inaccurate

  • Absence of a Bortle Scale for the majority of images

Luka Poropat avatar

Bob Lockwood · Feb 2, 2026, 05:26 PM

Salvatore Iovene:
When missing, show an “Estimated Bortle Scale” based on location (where available)



Hi Salvatore,

I'm not sure adding an 'Estimated Bortle Scale' is really fair since it doesn't know the actual conditions for the location. As an example, if I don't put in a Bortle number, it will state I'm in a Bortle 4-4.5. That's just not correct as I measure on average 21.3 depending on what chart you look at and being about 40 miles east of San Diego and if a thick marine layer comes in, it could go down to a good Bortle 2.

I believe if you want to be specific as Astrobin should be, SQM should be the only choice.
Not a subjective scale where everyone can say whatever they want estimate based on what they “see”.

It is 2026 and using such scale is pointless. It is like measuring temperature by asking people how warm they feel.

Salvatore Iovene avatar

Luka Poropat · Feb 2, 2026, 05:50 PM

I believe if you want to be specific as Astrobin should be, SQM should be the only choice.
Not a subjective scale where everyone can say whatever they want estimate based on what they “see”.

It is 2026 and using such scale is pointless. It is like measuring temperature by asking people how warm they feel.

That's true but how many people have an SQM?

Arun H avatar
Salvatore Iovene:
That's true but how many people have an SQM?


I make it a point to enter a Bortle Scale  for every individual session I enter. This is for my own records and I let Sal's program calculate the ultimate Bortle number using whatever weighting exists.

The Bortle number I use is what clearoutside says is the Bortle scale for the location. So it is B6 for my backyard and B4 or B5  for a couple of other places I image from. I have no idea what the actual SQM is for any of these location. Most assuredly it varies, depending on the time of night and snow cover. I have no plans at all to buy a SQM meter. If I am forced to enter one by AB, I would probably be very upset....it adds little value to me; most likely I will simply make up a number. I wouldn't be surprised if others do as well.
andrea tasselli avatar
Actually, you don't need to buy a SQM device but you DO need to use a mono camera with your scope. And point it to the right location in the sky, a patch of sky mostly free of nebulosity or high star density, possibly overhead or close enough.
SonnyE avatar

One thing about Bortle scale is it really is a very local estimate. And not really noteworthy because the only way to change it personally is to filter it.

That is what I do. I have two LP filters to kill the light pollution my idiot neighbors force me to endure. And I have installed wall topper extensions to my block walls to barricade their ignorance from my immediate area. The newest A ’holes next door are prison guards and light up their back yard at night. She took exception to my camera on my back wall I use to observe my mount and telescope with my phone app. Once it was clear what kind of Ken and Karen neighbors they were, a wall topper went up blocking them out. 😝

And she had a tantrum in her driveway the day the installers were here. I found her pacing and yelling on her phone quite amusing. But the wall is mine, and local codes allow my wall topper. I effectively have 8 foot high walls to shade me from them, and the condo complex across the drainage wash behind us (I call it my mote to keep the condo clowns at bay). We actually find our “Bin Laden” compound very nice now. No more rocks or dirt clods from the condo brats in our pool, and no more pointed questions from the A ‘hole next door. (Like how many cameras do you have aimed at my house. (None. My cameras are for MY use.)

I chose to control matters in my own way. Makes them good neighbors. 😉 And it is the ultimate middle finger. I tried to reason with them, but they just got more obnoxious. Now, no irritation on my side of the wall, and a giant blank space to accent their prison decor.

Alan Brunelle avatar

Chris Strobel · Jan 22, 2026, 04:51 PM

Stephen Williams · Jan 22, 2026 at 07:13 AM

I’d find a different hobby if my only option was remote imaging.

Yeah maybe Scanning Electron Microscopy might be cool .. set it up in your garage 😬

I had a friend from some years ago (~20) who did just that. Only he set his up in the living room. He was a bachelor! Got his surplus from the University of Washington.

When I was trained on transmission and scanning transmission microscopy, I can tell you it is possible to do this stuff now for a lot less than a good number of people spend on gear in this forum. Now if you want to see much smaller things in nature than close up views of fly eyes, etc, at superb resolution and contrast, I would suggest that you look into atomic force or scanning tunneling microscopy. Understand that the originators of that technology were visiting Hallmark stores to find the motors (piezo electric) that allowed some cards to play music to build their microscopes that were able to achieve molecular/atomic resolutions!

I know that you were jesting, and that is well taken by me. But be careful what you jest about!

Alan Brunelle avatar

Luka Poropat · Jan 22, 2026, 05:18 PM

In 20-50 years I expect a similar forum post to this titled: “Amateur space telescope imaging vs traditional on Earth methods” ?

This will most certainly happen in the not too distant future. Then the Chilescope group (and the like) will suffer envy! That said, the Chilescope+ groups will then immediately be welcomed into the “normal” people club! Not sure whether that says more about those in the Chilescope+ groups or those who endlessly bitch about those who do belong to that group, or any other groups. I say this in jest, because I think this question, as posted, is a real valid one and asks for personal feelings about how these different modes affects the individuals who practice the different modes, or all of the modes. Though I absolutely do not jest about amateur space telescopes. Already have heard serious inquiries. The only thing that will stop such a thing is if the Kessler Syndrome initiates, and then no one will be putting up anything, no matter how frivolous. And that is no joke!

Carastro avatar
Isn't there a Bortle Scale website where you can enter the location and it will give you the scale.  Or is this not accurate?  

I know you need to take into consideration local LP as well, but just a guide would be helpful to other users.  

I use this:

https://www.lightpollutionmap.info/#google_vignette
Helpful