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Hi all, I'd like to purchase my first telescope but I need to know if I should allocate more time and effort to observing with a larger aperture telescope(say 100mm-127mm aperture) but having opportunities to not-as-bright skies(say Bortle4+) or if I should invest in a smaller aperture telescope(say 70mm-90mm) but having access to more dark skies(say Bortle1-3) because of portability.

For example, will I be able to see the Orion Nebula better with a 100mm telescope in a Bortle 4 sky or with a 70mm telescope in a Bortle 3 sky?

Note that I will keep the type of telescope the same for the 2 comparisons. And let us assume that hypothetically the weather is the same between the dark skies.

I apologise if there are any mistakes within this post or if this question has been asked before.

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No, for deep-sky observing dark skies are generally more important than aperture. For instance a 60-mm scope under pristine skies will show each and every galaxy in the sky much better than a 300-mm scope in the middle of a city.

However, it is a matter of degree, and it also depends what target you're viewing. The case posed by the original poster posits quite a big difference in aperture (a 100-mm scope gathers twice as much light as a 70-mm) and a fairly small difference in skyglow, because both Bortle 3 and Bortle 4 are dark enough to allow decent deep-sky observing. In that particular case, quite a number of deep-sky objects -- including the Orion Nebula -- would look better in the 100-mm scope under Bortle 4 than in the 70-mm scope under Bortle 3. But even with an ultrabright object like the Orion Nebula, some of its aspects will still show better with the smaller scope under darker skies. If you're talking seriously faint but large objects like (say) Barnard's Galaxy or the California Nebula, the 70-mm under Bortle 3 will do much better than the 100-mm under Bortle 4.

I will echo Tony's comments with respect to dark skies. Nothing helps viewing DSOs more than dark skies. I would much rather have my 90mm MCT under Bortle 2 skies than my 10" under Bortle 4+. I have repeatedly done these comparisons (I use Bortle 1-2 and Bortle 4+ sites regularly). Finding DSOs is easy in Bortle 1-2, many of messier objects are naked eye visible in Bortle 1-2. In Bortle 4+ it becomes much harder to find objects, even in a telescope, and the light pollution washes the objects out. If you have a choice always take dark skies over aperture. Having said that, lots of aperture under dark skies is amazing. My daughter and I compared the 90mm to my 10" one night under Bortle 1 skies. The 90mm easily found many Messier galaxies which were visible (about 20ish on that night). With 10" I found 70 galaxies in Virgo alone in under 2 hours (I could have found many more with patience and time). In Bortle 4 skies, you can find most (Tony could find all of them) of the bright Messier objects with 90mm, with the 10" the Messier objects are still easily doable in Bortle 4 but the of the many Galaxies in Virgo that I found in Bortle 1 skies probably only 20 or so are easily identifiable in Bortle 4.

Personally, I would always recommend a larger telescope than a smaller one for DSOs. The only reason not to get larger apertures for DSOs is portability and weight (how easy it is for you to transport and carry). Larger apertures collect more light of the very faint and fuzzy Galaxies and Nebulae. This is why Aperture Fever is a real thing for many astronomers, more aperture means more visible DSOs. If you can afford 127mm vs. 70mm then go for 127mm (127mm telescopes are really not much more to transport and move than a 70mm). FYI a 127mm telescope has over 3 times the light gathering power of the 70mm as the light gathering power goes up with square of the radius. My 10" is actually has 8 times the light gathering power of my 90mm (3.5") this makes a huge difference for DSOs but dark skies are still a much bigger difference.

The 130mm reflectors perform well under dark skies. I live in Bortle 8/9 skies. Bortle 4 is dark by comparison. Bortle 4 to bortle 1 is a more subtle difference. The things that you need bortle 1 skies for also benefit from as much aperture as you can get out to the dark sight. Consider that dobs and mini dobs are often as easy or easier to transport as a tripod mounted scope.

Mountainfilm, town work together for one-of-a-kind programTypically, the only souls found roaming Tellurides streets at 3 a.m. are bears and the occasional insomniac. But on May 24 during Telluride Mountainfilm, roughly 80 people  photographers, astronomy fans and festival attendees among them  gathered in front of the San Miguel County Courthouse during the witching hour for a one-of-a-kind event that celebrated the night sky.Mountainfilms Dark Sky event, which was organized through a partnership with the Town of Telluride and photographer Ben Canales, represented what is believed to be the first attempt of an American town to shut off all its lights in order to obtain an unadulterated view of the stars.The event saw mixed results, as some private lights were left on. Despite that, Canales said the enthusiasm among participants was huge. Canales thinks there is room for improvement and he and Mountainfilm hope to do it again, only better.People were so stoked about it, Canales said. Im all fired up to give this a go again.The event was the brainchild of Canales, who hatched the idea after shooting night images of Telluride while attending Mountainfilm in 2014.Venturing out of town one night to set up photos, he said, I was just shocked at how quickly the view of the stars became amazing.It occurred to him, he said, that if he could get the town to agree to turn off its lights, it would open up amazing opportunities for photography and double as a conversation starter on light pollution. Canales approached Mountainfilm with the idea late in the winter, and the festival jumped on the idea.The event fit Mountainfilm in many ways, said Program Director Katie Klingsporn. It was an opportunity to raise awareness in a bold way about an important issue and get our audience outside to celebrate the outdoors through images.The Town of Telluride agreed to participate by having staff shut off all town street and facility lights, and the festival did outreach to private homeowners and businesses, imploring them to switch off all lights before going to bed the night before the event. Still, going into the first event ever, there were a lot of unknowns and hurdles.The biggest one turned out to be the weather; snowstorms and cloudy skies leading up to the event created uncertainty that it could be pulled off. But at about 10 p.m. on Saturday night, the skies miraculously cleared.And at 3 a.m., nearly 80 people showed up  an amazing turnout considering that snowflakes were falling only hours before. But while the enthusiasm from the crowd was high, participation by property owners wasnt 100 percent, and a few lights were left on, affecting the view of the stars.Its just the crazy nature of light where a few light bulbs scattered around look like a lot of light, Canales said.Telluride Town Manager said from a town perspective, turning off the lights was a fun exercise and a cause the council was happy to support.This was an opportunity to be part of something really cool, Clifton said. I think that the bigger issue of light pollution and what we can do here to minimize our light trespass on starry skies ... is on everybodys mind. I think thats just where the conversation starts. I dont think thats where it ends.Canales hopes the photos and video from the event help encourage people to go completely black next time and continue the conversation about light pollution.I think its a new nature awareness that hasnt really been a cultural topic until recently, Canales said. In two generations weve lost all touch of what a starry night looks like because we all live in cities. But photos remind people that the stars are still out there. We tried this once. Now lets go bigger.Join Our CommunityStay up-to-date with all the latest news and event information.Email Address Sign UpAbout AboutAbout Mountainfilm Contact Us Staff Festival Staff Boards Media Employment Get Involved Get InvolvedBecome a Donor Become a Sponsor Our Donors Our Sponsors Lodging Sponsors Opens in a new window/tab. Opens in a new window/tab. Opens in a new window/tab. Opens in a new window/tab. 2024 Mountainfilm. All Rights ReservedTerms & ConditionsPrivacyContact Us

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After a grueling three-year journey of over 150,000 miles traveled and 3,000,000 pictures taken, renowned timelapse filmmakers Harun Mehmedinovic and Gavin Heffernan are proud to introduce SKYGLOW; a hardcover photo book and timelapse video series exploring North America\u2019s remaining magnificent night skies and the grave threat of light pollution to our fragile environment. SKYGLOW explores the history and mythology of celestial observation, the proliferation of electrical outdoor lighting that spurred the rise of the phenomena known as \"skyglow,\u201D and the Dark Sky Movement that's fighting to reclaim the night skies. Featured by rock legends The Rolling Stones and Pink Floyd's Roger Waters, BBC Earth, National Geographic, Time, National Park Service, and over 1000 media outlets, SKYGLOW images and videos have been seen by over 200M people. 006ab0faaa