[2] I have used an xcel 3x Barlow for imaging solar system objects and also for visual observing, since about 5 years. Felt the need to try out a focal extender this time. This seems to be widely recommended and hence purchased this. I am quite happy with the results I am getting. The build quality seems to be great for this price point. Very happy with this!

[0.94 lb] I use the 2 2X Explore Scientific Focal Extender with 2 Eyepieces in 25, 30, 35mm (70 degree FOV Bressers) primarily for viewing Deep Sky Objects: Clusters, Nebulas and Galaxies. My scope is a Meade LX 90 8 inch. The results with the 2 extender are pretty amazing. I begin by using a 20 or 25 mm eyepiece without the extender to find the object. Then for the increased magnification I switch to the 2 extender with either the 25 mm or 30 mm 2 eyepiece . Before getting the 2 extender I used a 1.25 2X extender (also Explore Scientific) with Plossls for viewing the deep sky objects. For the most part, with that setup the objects were bright and clear but, with the narrow FOV of the Plossls, not as dramatic. With the 2 extender and the 2 Bressers the clusters and nebulas are bigger, brighter, well defined objects. The clusters especially are bright and clear with many well defined points of light. The Galaxies are still fuzzy objects, but magnified. If there is a downside to the use of the 2 extender for me, it might be the weight. The combination of the 2 Extender, a 2 Diagonal, and a 2 eyepiece is heavy. But, so far, the scope performs just as it did with the 1.25 setup. Also, the 2 setup prevents the scope from going to zeinth. A 1.25 adapter is included with the extender so it is not necessary to have both the 1.25 and the 2 extenders. I am completely satisfied with the extender.

[2] This is a amazing piece, you won't be disappointed with it. It is heavy, but worth it. A nice way to get more performance from your 9mm eyepiece on clear seeing nights. It comes with a 2 to 1.25 adapter as well. I picked up a separate 2 plastic plug so I would not have to use the metal adapter as a plug on the female end.

[9.1 oz / 260 g] There are many A+ reviews about the 2x Extender from Explore Scientific! Add my opinion as A+. Okay, so the glass is excellent and the machining of the unit is exemplary - fit & finish unbeatable. What puts this above & beyond are the instructions are easy to read & understand, and the box from ES is an amazing work of art and utility! Seriously! The box alone is probably worth keeping & displaying at any gathering! The extender is hefty and is packed well within; a given. The covering is based on Wil Tirion's Uranography & Graphic Design! My wife was more impressed with the boxes, than the gadgets! Guys, ponder it. I may survive this purchase. LOL!

[2] This by far is the best focal extender in my collection. Flat from edge to edge with no image distortion. By far worth every penny. I will enjoy this extender for years..

[2] I ordered this product to multiply magnifications of my eyepieces. I tested it for planets and double stars at very high magnifications, and really like the product. The green color coating looks great. I think $ is a bargain for a four element 3x barlow. B&H shipped really quickly. Overall, I like the B&H service and price, and I highly recommended this 3x barlow.

[1.25"] I have had nothing but cloudy weather every since I purchased it.
Tonight however I had a very short window to give it a try. I used it in conjunction with an Explore Scientific 14mm 82 degree field eyepiece as a test. Viewing Jupiter through my 6 inch Celestron Evolution telescope the 14mm gives me 107x. The view was very sharp. When
I added the 2x focal extender the view of Jupiter lost no sharpness or contrast. Magnification was now 214x on a very average night. This is the best by far of a variety of 2x Barlows that I have used over quite a long period of observing.

[2] I've only run one night with this but from what I can see, there was no degradation of visual or photographic by putting this into the optical path, the build is rock solid.

[9.1 oz / 260 g] I paid Only 99 dollars to get this FExtender w/4 optical elements, cause it was on discount!. Thanks B&H for that! Quality is superb and after a few weeks I am pleased with buying. I have improved my observation and photo/video capacity of my Comet Hunter. Great job of Exp. Scientific with this 2X extender. Highly recomendable.