I have reviewed all of these stores and actually bought products from them to verify authenticity. AliExpress is a legitimate site and these stores are too. Most are just selling OEM goods or stuff rejected from QC due to cosmetics. The ES eyepieces even have full serial numbers in some cases.

Last updated October 3, 2022

Part of the larger Zane Landers ATM Library, full folder available here 

Eyepieces

1.25”

XWA/UWA 80-120 Degrees

• 7mm APM XWA direct from Germany - Astronomics has all other focal lengths at lowest prices currently
• Meade UWA
• 14mm ES82
• 8.8mm ES82
• 6.7mm ES82
• 4.7mm ES82
• Kunming 82-degrees, identical to WO UWAN (similar to ES82)

• Backup

• 11mm and 16mm Angelfish- Only really good at f/8 or above
• Meade MWA ~90deg AFOV 10mm and 15mm

SWA 65-75 Degrees

• 24mm ES68
• ES 20mm, 16mm, 28mm 68 degrees 
• 27mm, 19mm, 16mm, 8mm flat field eyepieces (separate links) - identical to Lunt, SVBONY etc.- best above f/5 to f/6
• Redlines - performs best above f/5 to f/6
• 15mm 1.25” SWA - Best above f/6
• APM UFF eyepieces - Works great at any focal ratio
• Baader Hyperion clones - Some focal lengths are better than others sharpness-wise

Plossls and Wide-Angles (<65 degrees)

• Sky-Watcher LETs - basically nice long eye relief Plossls

• LETs with normal eyecups

• 20mm Konig
• 10mm Konig - Same as Sky-Watcher “Super”, these are nice
• Nice generic Plossls - Same performance as the Omni
• TMB Planetary eyepieces
• Vixen SPL clones
• Apogee Orthoscopics - Great but narrow AFOV
• Celestron Omni Plossls
• El cheapo aspherics - the 23mm is good but easily scratched due to the plastic eye lens, 10mm is okay, 4mm sucks unless you remove built-in Barlow to convert it to a 7mm. Field of view is about 65 degrees and good correction in fast scopes.

• Set of all 3 at a discount

• 30mm ES52 - Same AFOV as a Plossl but nice eye relief
• 3mm ES52 - Same AFOV as a Plossl but nice eye relief
• Celestron 1.25” Zoom - these are good, avoid most other zooms.
• Generic smooth top Plossls
• Plossl/Barlow set
• Super LER 20mm/10mm

2”

XWA/UWA (80-120 Degrees)

• 9mm ES120
• Meade MWA ~90* AFOV - These have mixed reviews but are good
• 30mm ES82 (backup link 1) (backup link 2)
• 24mm ES82 (backup)
• 18mm ES82
• Weird 23mm 82-degree - probably a Celestron Luminos, try at your own risk, the ES 24mm 82 is only a little more expensive
• Angelfish/etc. 80-degree 2” eyepieces - Great if you have an SCT, don’t try it in a Dob, 40mm is actually more like 65 degrees. The 20mm is just a Barlowed 30mm. 15mm is available at a lower price in the link below.
• Cheaper 15mm Angelfish

SWA/Plossl (<80 degrees)

• 26mm 2” SWA/GSO SuperView - Performs best at f/6 or above, works down to f/5
• 28mm ES68
• 34mm 2” SWA - Performs best at f/6 or above, works down to f/5
• More 2” Angelfish
• Baader Hyperion Zoom
• APM UFF eyepieces - Works great at any focal ratio
• 28mm LET

26mm Celestron 2” E-Lux - Comfier to use than a 25mm Plossl though field of view is basically the same

• 2” Celestron E-Lux Kellners - Comfier than Plossls, best used in SCTs/Maksutovs but generally fine at f/6 or above

Telescope making

Best deals as of August 2022

• 6” f/8 parabolic mirror set (only $75ish shipped, same as my Reddit giveaway)
• 8” f/6 parabolic mirror set (only $130ish shipped!)

• Link 2
• Link 3

• 8” f/8 parabolic mirror set (same price as the f/6 though, just get the f/6)
• 114/900 primary- build your own Kissner Hadley or make a custom Dob with a PVC pipe or something, lots of options

• Full optical set with secondary mirror
• US seller link via eBay
• US seller link via Amazon

• Secondary mirrors
• 6” f/3 parabolic primary mirror - yes, f/3!
• 6” and 5” f/5 parabolic mirrors
• 6” f/4 parabolic mirrors
• Synta 2” Crayford focuser - cheap but no base plate
• GSO 2” dual-speed Crayford

Other stuff which I wouldn’t really recommend, but maintained as backup

• 6.3” f/8 optics - Yes these are spherical but within ¼ wave at this focal ratio. Avoid similar 6” f/5 and 8” f/4 sets that are spherical
• 6” f/5 parabolic optics
• 8” f/4 parabolic optics
• 6” f/4 and f/5 parabolic optics
• 6” f/8 parabolic optics
• 8” achromat objectives
• Secondary mirrors
• More secondary mirrors
• 35mm secondary mirrors - These are unusually thin but work fine
• A variety of spherical optics - avoid anything below f/7 or f/8
• 8” mirror cell
• 2” Crayford focuser
• 1.25” R&P focuser
• Meade 2” focuser adapter for DS, RG etc.
• 6” achromat objectives

Telescopes (OTA only)

Newtonians

• Sky-Watcher 130PDS Astrograph - not really a deal if you’re in Canada or Europe, but better than complex process of importing for Americans
• Sky-Watcher 150PDS Astrograph - for those who want a 6” f/5 astrograph and not f/4
• 150mm Bresser astrograph - Only a single speed focuser though.

Refractors

• Explore Scientific ED80 Triplet OTA - Has annoying spikes on stars from lens retainer screws unless stopped down to ~76mm. Also not the greatest optics.
• ES 102ED Triplet OTA - Often iffy QC optically but generally good
• ES 127ED Triplet OTA - Lots of blue CA but a nice visual or astrophotography scope.
• Orion ST80 OTA
• Long Perng refractors
• 60mm ED doublet

Maksutov-Cassegrains

• 130mm Maksutov OTA - Formerly sold as the Celestron C130, KONUS 130mm, these are nice
• Bresser/ES 6” Maksutov with Crayford focuser - These are heavy but quite good

Other accessories

Optical accesssories

• Celestron binoviewer and Barlow - These are good, Barlow is needed for any non-catadioptric scope to reach focus unless you have a Sky-Watcher Collapsible/FlexTube/OneSky/Heritage in which case you can partially retract the trusses. Also vignettes with anything with a field stop bigger than ~21mm so no 32mm Plossls or 24mm Panoptics. Best used with goldlines, ES82s, or 25mm Plossls.
• 1.25” 2x Barlow lens with T-adapter. Unscrew Barlow to just use the T-adapter, use it with the T-adapter, screw it onto an eyepiece for 1.5x, or just use as a regular 2x Barlow
• Celestron Omni 1.25” 2x Barlow
• 2” 2x Barlow
• EX 3x Focal Extender
• ES Focal Extenders (basically superior Barlows)
• Optolong 2” UHC filter - these are good, on par with Orion Ultrablock
• Optolong 1.25” UHC filter
• Optolong 2” L-Pro filter
• 1.25” OIII filter
• Questionable 1.25” UHC filter
• 1.25” IR Pass filter
• Sharpstar coma corrector

It should be obvious, but don’t buy any solar equipment from AliExpress. It’s probably safe, but are your eyeballs really worth a few bucks in savings from gambling with the Chinese?

Non-optical accessories

• Green laser pointer
• Batteries + charger for laser pointer
• Smartphone adapter for eyepieces
• Cheshire collimator - Same as the one included with the OneSky
• 1.25” extension tube
• 2” to 1.25” compression ring adapter with filter threads - better than the crap Sky-Watcher and Orion provide
• AZ-GTi mount
• Star Adventurer
• Ball and socket joints