This level of engineering and polish makes this eyepiece a real bargain. Three different eye cups are included for every preference. The zoom is continuous and not just the focal lengths noted on the side, one can get the magnification JUST right for your area of interest. What's not to like.
This is a great choice for double stars and especially the moon. Some may prefer larger fov for the faint fuzzies, but for everything else you won't be disappointed.

I already owned the Mark III version of this great eyepiece and normally I wouldn't have bothered upgrading but due to FLO's great limited time offer, I sold on my Mark III and bought this Mark IV version along with the matching barlow and I can confirm that this is well worth the upgrade. A much more manageable size than the III and lighter too. Same great image quality and my own opinion is that the clickstop mechanism is better. I've got a 120ED refractor and I'm down to just 2 eyepieces, this one and a 40mm Swan. For my purposes, when the zoom eyepiece is this good then I don't really need any other primes. The only negative is that the FOV is a bit narrower at the 24mm end.

If you are looking for a zoom eyepiece without compromise, then this is it!

I have shied away from zoom eyepieces since my first view through a 'high quality' 1960s zoom way back when. However I had a chance to look through a Hyperion MK 1V Zoom recently and that changed my mind. With my 11" SCT I get 119x - 350x with a twist. The eye relief is very good and also adjustable for comfort, comes with an optional eyeguard and zooms very smoothly. Distortion is minimal for this form of eyepiece and it certainly serves a place when viewing the moon and planets, my primary target for its use. I have a lot of expensive eyepieces that would fill the bill and being a fixed focal length might outperform the zoom, probably will to a degree. Then again I dropped a $300 eyepiece a few weeks ago, fortunately hitting the grass rather than the paving. With the zoom changing eyepieces is minimized and so is the risk related to dropping one. This came with a 2" adapter with a 1 1/4" central endpiece. Thus it can be used in either 1 1/4" or 2" eyepiece holders. However the 2" adapter isn't threaded for filters but I do have all I need in both 1 1/4" and 2" so no loss. For someone who may use this as a primary eyepiece, the 1 1/4" filter threads will cut the cost of very expensive filters like the L G2 UHC! I've given this 5 stars and also FLO a best buy! Here in the states these sell for $340 + tax so a $100 savings to me! Can't beat the deal and the eyepiece is already a proven winner.

Quality replacement and light years better than the standard lenses supplied by low to mid range priced scopes. Saves changing individual eyepieces in the dark. Minimal loss of brightness at 8mm but compensated by a 68° field of view. I've overcome that a little by changing to a mirror diagonal for astronomical use. For terrestrial use, with a prism diagonal, it acts like any zoom on a spotter scope, so brightness isn't an issue. Comes with adaptors for cameras etc. On my Sky-Watcher AZ5 deluxe scope, with a focal length of 1500, the 8, 12, 16, 20 & 24mm give magnifications of x187, x125, x93, x75 and x62 respectively. All I've added to my eyepiece collection is a is an Explore Scientific 52° LER 6.5mm giving me x230 mag..when I can use it! I haven't bothered with a Barlow lens but that would give you even more combinations of mag. Finally, thanks to all at FLO, excellent service and special thanks to Alex for his helpful emails.👍🏼 I wouldn't buy from any other supplier.

I purchased this Baader Hyperion Zoom Mk IV to replace the earlier model Mk III that I sold several years ago when down sizing my collection. I have since regretted that decision. The new version is still made of quality material and is much lighter. I use this on a new GSO CC6 with great results. Use has been limited so I will write a mode detailed review at a later date. Eyepiece was packed very well and shipped quickly. I am very pleased with this purchase.

I spent much time researching a zoom lens, deciding on this. It does not disappoint.

First use of this with our StellaLyra 8” Dob, treated as 1.25” lens and no problems focusing added Barlow again no issues with focus. Just what me and my daughter needed, zoom out find thing, then zoom in - Orion Nebula Trapezium which for a couple of new scope users was really good to see. Happy 60th to me!

After a great deal of deliberation I eventually decided to find out if one eyepiece really would meet most of my needs - It does!
I think it's biggest benefit is that it leaves me free to focus (sorry!) on what I have set the scope up to see and not on ferreting about in the dark for other eyepieces - I should have bought one ages ago.
The quality of the optics is superb and having compared it against several other (single focus) eyepieces I can confidently say that you really do get 5 excellent eyepieces in one package. I bought the matching Baader 2.25x Barlow to go with the Zoom and would recommend that you do the same - they are a perfect pairing.
The delivery from First Light Optics was immediate and first class.

So glad that i finally caught these being in stock as they sell like hot cakes. The Zoom mechanism is silky smooth with just the right amount of click at the predetermined focal lengths. The image is clear and concise out to the edges, with plenty of contrast. All in all it’s a pleasure to use with just a small focus adjustment needed when changing the focal length

Having gone through quite a lot of different EP’s over the years I finally got this Baader Hyperion Zoom EP and love it. Used mainly in my scopes now when viewing, this covers most magnifications I generally need and use, so not often is another EP used apart from this. Great delivery from FLO, and well recommended.