Vixen Porta II A80Mf Review: A Superb Beginner Refractor — and a Warning About Buying One Used

The Vixen Porta II A80Mf is one of the best “just go outside and look” telescopes a beginner can own: an 80mm achromatic refractor on a smooth, no-fuss alt-azimuth mount. I like mine a lot. But I didn’t buy mine new — I bought it used, on a big consumer marketplace, partly out of morbid curiosity about what beginners are really walking into. What showed up taught me more about buying a used telescope than any spec sheet ever could.

So this is two reviews in one: an honest take on the A80Mf itself, and a warning about the second-hand listings it so often hides in.

What actually arrived when I bought one used

The listing didn’t say “junk.” It looked like a clean, working scope — just photos, no description. Here is what was actually in the box when it arrived:

• A filthy objective lens. In the photos it honestly looked like fungus. In person it was grime — almost certainly a child’s fingerprints and smearing — but heavy enough that the front lens was effectively unusable. Not one word about it in the listing.
• Both eyepieces missing. You cannot observe anything without an eyepiece. Gone. No mention.
• No star diagonal. The right-angle mirror you need for comfortable viewing — missing too.
• A snapped thread on the focuser where the eyepiece secures. A beginner would struggle to even attach an eyepiece.
• No lens caps, no eyepiece caps, no manual. A first-timer wouldn’t even know what was missing.

This was selling for around ¥25,000 (~$160). A complete beginner would have bought it, taken it home, and had no idea why nothing worked — and no way to know that replacing the missing parts with genuine Vixen accessories runs well over $60–100 on its own. The manual was gone too, so they wouldn’t even know what they were missing.

I knew what I was looking at, pointed out every fault, negotiated, and got it for close to $65. Because the core optics turned out to be fine once cleaned, I’m happy with it. A beginner would have been stuck with a paperweight.

The objective looked like fungus — and needed stripping down

Here’s the part that should stop any beginner cold: cleaning that front lens wasn’t a wipe with a cloth. The grime had worked into the assembly, so the objective had to be partially disassembled and cleaned — lens elements out, cleaned, and re-seated in the correct orientation and spacing.

I’m comfortable doing that. A beginner is not, and shouldn’t be. Get the spacing or orientation of an achromat’s elements wrong and you’ve degraded the very thing you bought the scope for. On a used listing, a dirty-looking objective isn’t a small cosmetic issue — it’s a potential dealbreaker you often can’t judge from a photo.

A second listing that was even worse

While writing this I looked at what else was for sale. One “junk”-labeled A80Mf had a bent focuser that wouldn’t lock, dents in the tube and tripod, a missing focuser screw, and debris inside the tube. Bent and dented parts mean it was almost certainly dropped — and on a precision instrument, a knock can quietly destroy the optical alignment you can’t see.

That one was ¥21,800 (~$140). A thrift chain would price genuine junk like that at a few dollars, and frankly even a few dollars would be a hard sell at that condition. New, this telescope is roughly ¥55,000 (about $350–450 depending on where you are). A near-write-off at $140 is absurd — and completely normal on these marketplaces.

For contrast: I once found a Raptor 60 at a proper second-hand shop, marked as “junk” only because it was missing a part — but structurally clean and undamaged — for a genuinely surprising price. That’s the difference between a curated resale shop and a random private listing: at the shop, a human who knows telescopes graded it.

How the A80Mf actually performs

Now the good news, because the telescope itself deserves it.

The optics are an 80mm aperture at 910mm focal length — about f/11. That long focal ratio is the headline: compared with a “fast” f/5 80mm, this scope shows noticeably less chromatic aberration (the false color around bright objects). Views of the Moon and planets are clean and sharp. The tube is a proper, solidly built achromat — not a flimsy department-store toy with a big magnification number on the box.

This is a see-it-well telescope rather than a pack-it-small one. The tube is long and not especially light, so portability isn’t its strength. What you get in return is honest, color-clean views.

• Optics: 80mm f/11 achromat — clean, low false color, great on the Moon and planets.
• Build: solid, not the hollow feel of a cheap import.
• Mount mechanics: Vixen dovetail (Arca-style saddle) makes swapping the tube easy.
• Expandability: none, really — no motorizing this. It is what it is.

Living with the Porta II mount

The Porta II is Vixen’s well-loved free-stop alt-azimuth mount: move it by hand, let go, and it stays put. Beginners and veterans both like it for one reason — immediacy. Set it down, and you’re observing. No power, no alignment routine.

Two things to know:

1. Balance it. Loosen the tube rings and slide the tube to get the fore-aft balance right. Add a phone for photos, or swap to a heavier eyepiece, and the balance changes — you’ll want to rebalance.
2. There’s no clamp. Instead, motion stiffness is set with adjustment screws (a hex key tunes it). Get the balance and stiffness dialed in and it free-stops beautifully; ignore them and it’ll drift or feel loose. Spend ten minutes tuning it before you blame the mount.

Is it dated next to a same-price GoTo mount like an AZ-GTi that finds objects for you? On paper, yes. But when I just want a quick look at the Moon, or to see whether Saturn’s up tonight, the Porta II is already observing while a GoTo is still aligning. For grab-and-go, manual wins. For a long deep-sky session, I’d take the GoTo. Different tools.

The eyepiece situation

Mine should have come with two eyepieces. If you buy this scope (new or used), pay attention to what’s included, because the stock pairing is a little awkward for absolute beginners:

• A 20mm (~45×) Plössl — usable, but a touch tight for finding targets when you’re new.
• A 6.3mm (~144×) — high power, only good on steady nights.

If I were kitting this out for a beginner, I’d want a 25mm (~36×) as the easy “find it” eyepiece, then add a 12.5mm (~73×) for planets and a 30mm (~30×) for wide, low-power star fields. Magnification is 910 ÷ eyepiece-mm, and a clean 73× beats a shaky 144× almost every night.

So should you buy one used? My honest take

Second-hand marketplaces are full of telescopes sold by people who, with no ill intent, simply don’t know what they’re looking at — sellers who can’t tell you the condition of an objective lens because they don’t know what one is. Combine that with how easily telescopes go wrong (a long tube is easy to knock; temperature swings and damp storage breed fungus on the glass), and the result is a lot of quietly broken scopes listed as if they’re fine.

If you still want to try the used route, at minimum:

• Demand clear, close photos of the objective lens and ask directly about fungus, haze and scratches.
• Confirm which eyepieces and the star diagonal are included — and that the focuser locks and isn’t bent.
• Check the tube and tripod for dents (a sign it was dropped, which can wreck alignment).
• Treat a vague listing with no condition notes as a red flag, not a bargain.

But honestly? For a first telescope, I tell beginners to buy new, or buy used only from a trusted specialist dealer who inspects and grades their stock. The worst outcome in this hobby isn’t spending a little more — it’s buying something broken, never realizing it’s broken, deciding astronomy “isn’t for you,” and quitting. That’s the real cost, and it’s not worth saving $80.

If you’re still choosing your first scope, see my best telescopes for beginners and, if planets are the goal, the best telescopes to see Saturn’s rings. Want a zero-risk way to start tonight? A good pair of astronomy binoculars shows you more of the sky than you’d think.

FAQ

Is the Vixen Porta II A80Mf a good telescope for beginners?

Yes. The 80mm f/11 achromat gives clean, low-false-color views of the Moon and planets, and the free-stop Porta II mount is about as easy as aiming gets — no power or alignment needed. Its main downsides are a long, not-very-portable tube and an awkward stock eyepiece pairing.

Is it safe to buy a used telescope?

Only with caution. Many private listings are sold by people who can’t assess optical condition, so dirty or fungus-affected objectives, missing eyepieces and diagonals, and drop damage are common — often with no mention in the listing. Buy used only with clear photos of the objective lens and a locking, undamaged focuser, or buy from a specialist dealer who inspects their stock.

What eyepieces does the A80Mf need?

With a 910mm focal length, magnification is 910 ÷ eyepiece-mm. A 25mm (~36×) makes a friendly low-power “finder,” a 12.5mm (~73×) is great for planets, and a 30mm (~30×) gives wide star fields. The stock 20mm (~45×) and 6.3mm (~144×) work, but that high-power 6.3mm only shines on steady nights.

Can a beginner clean a telescope’s objective lens?

Light dust, yes — gently. But a heavily soiled objective can require partial disassembly to clean properly, and re-seating an achromat’s elements in the wrong spacing or orientation degrades the optics. That’s not a beginner job, which is exactly why a dirty-looking lens on a used listing is such a risk.

Porta II A80Mf or a GoTo mount like the AZ-GTi?

For quick, grab-and-go looks at the Moon and planets, the manual Porta II is already observing while a GoTo is still aligning — and it needs no batteries. For long deep-sky sessions where you want the mount to find faint targets, a GoTo earns its keep. They suit different styles of observing.