This is a shootout between eight reasonably priced achromatic 1.25“ Barlows. I’ve acquired these over a period of years, two were from kits, one came supplied with a 102mm refractor I bought recently, one was on sale and the others probably seemed like a good idea at the time. None of them have compression rings and some of them now have different drawtubes. From left to right in the above picture, they are: 1/ Meade 2x Telenegative 2/ GSO 2x 3/ Celestron Omni 2x 4/ Celestron 2x (94303 Eyepiece and Filter Kit) 5/ Baader Q-Turret 2.25x 6/ Celestron 2x Barlow T-Adapter (AstroMaster Kit) 7/ Sky-Watcher 2x Deluxe Barlow 8/ Celestron 2x Barlow T-Adapter Over a period of time I’ve used these in 130mm, f/6.9 and 150mm, f/6 Newtonian telescopes, 90mm and 102mm Maksutovs and in two ST80 short tube achromatic refractors. They all seem good quality to me and any real differences are mainly ergonomic. Three 'Barsta' T-Adapter Barlows The Meade has the shortest focal length and has a chromed brass drawtube, as far as I can tell the element can’t be unthreaded. I’ve easily had a 300x magnification on the Moon with a 6mm Plossl on both of my Newtonians with no noticeable problems. The element itself is nicely sized and the field lens surface seems quite highly curved and well coated. The thumb screw seems a bit wimpy to me though, but overall the Barlow feels like a quality product. I’m guessing the glass is JOC. Comparison between the very similar GSO and Celestron 2x Barlows. Note the drawtubes are different lengths denoting different focal points, plus the elements are noticeably different designs. The GSO has a removable element, a smooth aluminium drawtube and probably the best thumb screw out of all of them. The focal point is different to the very similar Celestron/Sky-Watcher Barlows and its drawtube is 30mm as opposed to the standard 22mm tubes on Barsta made Barlows. The elements are also distinctly different to the Barsta made Barlows of 3, 4, 6, 7 & 8 in this list. In fact the Barlow elements in 3, 4, 6, 7 & 8 are identical as far as I can tell, both in their design and the way they focus. These five Barlows are all almost certainly made by Barsta. Celestron kit Barlow and T-Adapter showing identical detached elements. The Celestron Omni and the Celestron 2x from the 94303 Eyepiece and Filter Kit are basically identical except for their colour. The Omni originally had the same type of drawtube but I’ve switched it to a smooth brass one. Their respective elements are removable. Five 'Barsta' Barlows! The three T-Adapter Barlows are more or less identical to the previous pair apart from having a T-thread. The elements are all removable. The AstroMaster Kit Barlow has its original chromed brass drawtube and has been used a lot as an extension tube over the past few years. The Sky-Watcher Deluxe has had its aluminium drawtube replaced with a brass one. It came included with my ST102 OTA. Baader and Meade elements. The Baader is a bit of an oddball. It is very small and light, yet very nicely made. It also gives a 2.25x magnification which is a little more powerful than the others. The element can be removed and threaded directly into an eyepiece. Although these were designed to be used with the Baader BCO orthoscopics I find it can work well with small Plossls and other orthoscopic eyepieces. I’ve had a sharp 337.5x on the Moon with this Barlow, and a 6mm Astro Hutech orthoscopic in a TS Optics (GSO) 150mm, f/6 Newtonian. Barsta element left, compared with the GSO element on the right. And the winner is ... well, there isn’t one. All of them are good.