Who is Al Nagler?

What does “artificial intelligence” have to say about Al Nagler?

Albert “Al” Nagler was a highly influential optical engineer, entrepreneur, and amateur astronomer who founded Tele Vue Optics. The company, which he started in 1977, became a globally recognized producer of high-quality eyepieces and telescopes. Nagler passed away on October 27, 2025, at the age of 90. 

Key details about Al Nagler and his career:

• Nagler designed the wide-field “Nagler eyepiece” in the early 1980s. These eyepieces provided a larger, more immersive, and sharper field of view. His work is considered to have elevated the entire eyepiece industry.
• Nagler designed optical systems for astronaut visual simulators for the Gemini and Apollo Lunar Module programs.
• Nagler was an active member of the amateur astronomy community. An asteroid was named 10715 Nagler in his honor in 1999.
• Tele Vue Optics was co-founded with his wife, Judi, and later became a family-run business involving their son, David.
• Nagler held patents for several inventions, including optical products and safety brakes for electric motors.
• Nagler received a Lifetime Achievement Award from the Astronomical League in July 2025. 

I had the honor to meet both Al Nagler and his wife at the 2017 Southern Star Astronomy conference in April of 2017:

Al Nagler: 2017 Southern Star Astronomy Convention: Little Switzerland, North Carolina

I was so sorry to hear about Al Nagler’s passing:

It was the April 2017 Southern Star Astronomy Convention sponsored by the Charlotte Amateur Astronomers Club, when a scheduled speaker for the convention cancelled at the last minute.

I’m not a member of the Charlotte Club, but had helped them over a few years to fill speaker positions at Southern Star.

A new speaker was needed…and really quick!

The Charlotte club officer in charge of Southern Star contacted me about finding a new speaker and asked if I could help in finding “the perfect” person to fill this now vacant position.

A solution, as I already had someone in mind:

I knew that Sue and Alan French were attending NEAF at that time. So, I called Sue via cell phone, and asked if she would talk to Al Nagler and see if he was interested in being a speaker at Southern Star.

Al was indeed interested and both he and his wife, accepted the invitation. 

Al gave a fabulous presentation concerning “everything anyone would want to know” about eyepieces. I don’t think anyone would know more about the science of eyepieces than Al Nagler. The presentation, to say the least was excellent…so much so, I even took notes.

Al Nagler and his wife Judi…two great people!

I was able to talk with Al and his wife for extended periods during the event, and also enjoyed having lunch with them in the Wild Acres cafeteria.

Photo as following: Al signing my “1000+ The Amateur Astronomer’s Field Guide to Deep Sky Observing” by Tom Lorenzin at the April 2017 Southern Star Astronomy Convention in Little Switzerland, North Carolina.

My signed 1000+ by Al Nagler and the late Tom Lorenzin pictured below:

(310120) Mullaney = 2011 DR25 Discovery: 2005-12-01 / L. H. Wasserman, R. L. Millis / Kitt Peak / 695 James Mullaney (b. 1940) is an American astronomy popularizer who has written about observing the night sky with naked eye, binoculars, and telescope. A former Curator of the Buhl Planetarium, staff astronomer at Allegheny Observatory, and an editor for Sky & Telescope and Astronomy, he contributed to Carl Sagan’s Cosmos TV series.

Visual observing and locating deep-sky objects manually, making notes and drawing what I see via the eyepiece is fun. I don’t embellish my drawings, but only what I see and with no computer enhancements.

To locate my selected deep-sky objects, for the evening, I just match up my finder view with the atlas and attempt to point the scope at the exact spot.

I use different sizes of brass and steel rings to match my finder(s) field of view. My choice for the last 15 years plus have been the S&T Pocket Sky Atlas’ which are compact and easy to use in the field. The black stars are so much easier to use as compared to atlas’ with white stars on black backgrounds. Plus, I like the larger format pages of the Pocket Sky Atlas’.

If you will notice, I draw circles (on the atlas pages) are for my “selected” objects. I don’t mind all of the drawn circles, soaked pages from dew, which shows the atlas’ have been well used.

A few examples of my humble pencil sketches. I have more than 200 sketches using this format (5 x 8) and about 1,500 using much smaller 3 x 5 cards.

NGC 55 coordinates: RA: 00h 14m 54 Dec. -39º 12m

Roger Ivester from North Carolina: Observing notes from +35º 18′ latitude as following:

Galaxy NGC 55 is the only deep-sky object that I was not able to locate and see of the entire 185 Observer’s Challenge reports. This was due to the low southerly sky position, and not being able to find an observing location without light glow.

I’m hopeful that I can again attempt to see this galaxy, but from another dark-site, which I’ve already selected. For convenience, light weight and ease of handling, I’m planning to use a 4.5-inch f/8 Newtonian. Update: Wednesday, November 12th: Too much sky glow overlooking a small town about five miles away. I spent about an hour…but no luck. Another disappointment.

November 14th 2025: I attempted from my backyard, and with a lightblock curtain, using my 10-inch, but unfortunately the galaxy was in the trees. It seems that I’m just not suppose to see this galaxy. I’ve just got to find that “perfect site” and I’m not giving up yet, as there is still time this month!

My notes from November and December 2012 as following:

Sue French observing from the Little Caymen Island:

November 30, 2005, Little Cayman Island. 10:10 PM EST. 113/450mm (4 ½-inch f/4)
reflector. Seeing: good, transparency good, sky, very dark. Scope not collimated.
At 14X, easily visible, highly elongated, bright galaxy with brighter elongated core.
Runs ESE-WNW. At 34X, very pretty. Large mottled core. Faint star south edge, west side.
Galaxy extends farther east than west of core. About 28’ X 2 1/2’. Star mentioned above plus
three others cradled south side. At 64X, mottling much more evident. Many faint field stars
visible. Skinny brighter triangle southwest.

October 2, 2010, 9:15 pm EDT, with a 130/819mm (5.1-inch f/6.3) apochromat. The
seeing and transparency were fair. At 23X there was a bright glow around a fairly bright star.
At 37X, the star was in the southern part of a 1¾ arcminute glow. A fainter, 1-arcminute glow
continued south from the brighter one. UHC or O-III filter not helpful. At 63X, the southern
part showed nicely, and there was a faint star in it. At 102X, the southern part was curved
concave west so the whole thing looked like a fat comma in my mirror-reversed view.

October 6, 2010, PSSG. 10:30 PM EDT. 130/819mm (5.1-inch f/6.3) APO. Seeing fairpoor, transparency good. At 37X, although the sky was milky down there, this large galaxy was
visible as ~26”ESE – WNW elongated galaxy. The western half was generally brighter. Mag.
10 star ~5’ SE of eastern tip and mag. 12 star S X E of western tip. ~ 4’ wide. At 63X, showed
up nicely and was quite uneven in brightness. The bright western area broadly brighter toward
the long axis. Eastern had a weaker brightening toward the east end. Three faint stars along
south flank: The brightest one mentioned above, the second brightest was south of the middle of
the western bright patch, the faintest star was on the galaxy’s edge between the two bright
patches. Another star hugged the south side of the west tip.

November 10, 2007, 8:15 pm EST with a 254/1494mm (10-inch f/5.9) Newtonian. The
seeing and transparency were fair. At 43X, this bright nebula spanned about ¼º and was
brightest around a mag. 7½ star in the center. At 68X, the bright central region of the nebula was
elongated north-south, 3 arcminutes tall, with pinched sides and a faint star off the southeastern
edge. At 213X, the pinch was prominent south of the mag. 7½ star, and the nebula section south
of the pinch was fainter than the northern part.

November 2, 2010. 9:30 pm EDT

I’m afraid my description of that observation was just the sketch. The only details were:
254/1494mm (10-inch f/5.9) Newtonian, 67X. Seeing and transparency, fair.

Jaakko Saloranta from Finland: Observing notes for NGC 55, are from the Canary Islands:

As can be suspected of the low declination, this object never rises above the horizon here
in Finland. My latest observation of NGC 55 was made in November last year from the Canary
Islands and specifically from the biggest island, Tenerife. I was observing within the Las
Cañadas caldera at an altitude of 6,670 feet (2,034 meters) with fairly good observing conditions:
naked eye limiting magnitude (NELM) near zenith of 7.1 with SQM-L measurements in the high
21.20s. What makes this observing site pretty good is the high altitude (above the clouds), low
humidity and excellent seeing. They don’t have observatories in here for nothing! My notes
with the 4.7-inch refractor using several different magnifications read as follows:

A gorgeous sight. Huge, WNW-ESE elongated galaxy with a mottled appearance. NW
part of the galaxy contained a bright, elongated nucleus with somewhat mottled appearance.
Two brightenings visible within the halo. Larger and brighter knot appeared as slightly NW-SE
elongated. The smaller and fainter knot appeared as a nearly stellar, roundish spot in the E side
of the galaxy’s halo with a faint mag. 14 star just W of it. A darker void seemed to separate these
two possible H-II regions from each other. Several mag. 10-14 stars in vicinity, within the halo.

The following image provided by James Dire from Hawaii:

My image as following was taken with a 102mm (4-inch) apochromatic refractor at f/6.4 with a SBIG ST2000XCM CCD camera. Note the dark “eye” in the galactic core, with the dark lane angled 60º to the disk superimposed over this.

The following image by Mario Motta at (+42º 36′) from Massachusetts with the galaxy being only 6º’s above the horizon!

This one is really tough being so low in the southern sky, but last night (October 18th 2025) I was able to make the following image. The galaxy was 6º above the horizon when I started and ended. It peaked at 8º at the transit of the meridian. The imagine required two hours of 5 minute subs with my 32-inch f/6.5 reflector telescope, and ZWO6200 camera, processed in Pix. 

I did not attempt color, as it was so low in the sky and have limited time between rising and setting. NGC 55 is actually close at 6.5 MLY in the constellation of Sculptor.

Now I have never tried this before, but decided to experiment, and somehow it worked out.

My 32-inch scope image of NGC 55 was only 6º above the horizon, so I got the brighter central region with detail, but the fainter outer region, especially lower left, was lost in the background glow. I’d made an image from Florida two years ago, and got the entire galaxy, but lacked detail, and did not capture the fainter region (C14)

Adrien Barrajon’s image (which I processed) from New Zealand had color but missing detail, and was taken with an 8-inch telescope.

So, I attempted to combine all images…taking some time, but took the detail of the center, overlapped that on the full image from my C14 from Florida, and then overlaid the color from the New Zealand color data.

The result is the combined data of three different telescopes, of vastly different sizes, and got this combined image. There are many hidden tricks in pixinsight, and I used up quite a few of them to get the following image. 🙂

Mario Motta

Two really “big and full” truck loads! I was so happy watching the trucks leaving with the tree!

Note the “too close” to the house problem tree in the background. If this tree would fall it could hit the house. Photo taken January 2025:

Aurora Borealis @ Latitude (+35 degrees ) October 2024: We had several nights that month, and also quite a few nights in May 2024 from our backyard also. Pretty far south for an aurora display, but incredible displays in April 2000. Note the problem tree.

While Debbie and I were eating a late lunch (Friday September 3rd) at a local restaurant and waiting for our food, I was looking at a Shelby Shopper. There was an advertisement in the business service directory:

CTS Tree Service that read: “Tree removal and stump grinding @ 704-418-3083” …also insured with free estimates.

This was obviously who I’d been looking for to remove a 40+ foot maple that was diseased, too close to the house, and hindered my astronomy observations! Also, the roots were running all over the backyard.

So, I started dialing the number. Debbie wanted to know who I was calling. Now was the time to get rid of this tree. The owner of CTS answered the phone. I asked when he could look at a maple tree in our backyard and he said he was in Shelby working a job near the Country Club but would come shortly!

When we got home, he was already looking at the tree. So, the following morning (Saturday) CTS was in our back yard with all the equipment needed to get rid of the tree! And they also cleaned up some pine tree brush from last years hurricane, that I’d been putting off.

We are happy with the work and especially with the results!

October 4th @ 3:30 AM as following. This was before the tree was removed, and the next photo is the day afterwards.

The following photo: October 5th @ 1:30 AM: Note the tree is missing, and now with an unobstructed view of the entire northeastern sky. 🙂

Now we don’t have to worry about the tree falling and hitting the house! And I really liked all of this happening in less than 24 hours! CTS did an excellent job for a very fair price. We are very pleased, and I would highly recommend them. 704-418-3083