Seben BA2 2x achromatic Barlow lens

I have been looking for a Barlow lens for some time that was both affordable and of good quality. Although it's difficult to tell on a website with this sort of thing, the photos looked encouraging as did the reviews. So I took a punt on this one. I'm so glad I did! This lens is fantastic, and the company sent it out very speedily despite a longer delivery period stated.A barlow lens will effectively double the effectiveness of any of your current lenses (for example a 35x magnification lens turns into a 70x magnification lens). You simply drop the barlow lens in where you would normally place your lens on your telescope, then just drop in your normal lens on top. This is a great way to give your telescope a boost relatively cheaply, as you can use a barlow lens to boost ALL of your lenses to get a bit more power out of them.A fantastic lens and a very promising company. Absolutely no complaints :)

I received the lens within a week of ordering. It came in a plastic bag (could do with more protective packaging), however the lens was perfectly fine. The lens did not come with a bottom cover, which could lead to dust getting in (thankfully I had a spare lying around). Apart from the minor details above the product was very satisfactory. It fit perfectly into my telescope, no looseness whatsoever. The quality of image received is very crisp, I did not notice any loss of detail. Some sights were exceptional, such as Jupiter and it's four moons. For such a cheap price I would definitely recommend it seeing such high prices from other manufacturers and such great quality, it does not come off as cheap at all. Great product.

I'm using this Seben 2x Barlow lens in a recently purchased Celestron 70 Travelscope and I have to say that the quality of this lens image through the telescope is really excellent. I also bought a slightly cheaper 3x Barlow plastic lens from a different company at the same time and the quality of image was very poor by comparison with the Seben lens. The Seben lens has glass optics and the difference in the clarity of image compared to the plastic lens is remarkable. I only wish that Seben made a 3x Barlow lens which I would purchase immediately, but I can't see one on their website?Seben's customer service is also superb. I bought a wrong sized lens which had already been dispatched but they managed to stop the shipment and give me a full refund the same day. The 2x Barlow lens also arrived much more quickly than expected (within a week of ordering) considering it is shipped from Germany.Quality product and quality service - highly recommended!

This Barlow lens appears to work fine, and used with the standard 9mm eyepiece which came with my reflector, gives a better image than a cheap 4mm eyepiece which I recently purchased.However, this lens only one cap, with the result that the far lens (which is almost flush with the end) is liable to be easily damaged when not in use. There was also no box for the lens - which originally me wonder if it really was new as stated. However, I am assured by Seben that it is indeed new, and that the lack of box and far lens cap is to keep the cost down, which seems curious as these surely cannot cost much.Seben also offered me a partial refund in exchange for removing my original review. I have re-worded it to reflect their reply, but not changed my main comment; I do not want a refund.

Bought this in January and just been able to use it for the first time and for the money wasn't expecting much. However I was not expecting fuzzy out of focus images. I am going to spend more money and buy skywacher to replace it. You get what you pay for but this was a waste of money.

The barlow lens is excellent value, and is of surprisingly good build quality. A good test I did to somewhat verify this is when putting a very well made webcam adapter into it, and let it drop in by gravity, it slowly went in, as air between the adapter and the barlow lens could not escape too fast out of the gaps, which verifies that the barlow lens is very accurate in it's circularity and general "even-ness". However, please remember how much you are paying, and note that there is a reason why this is a third the price of celestron barlows. More expensive equals better quality lenses and geneal build quality. Never-the-less, I would recommend this. I have used it so far to view the Moon, Jupiter, and Mars, and I have to say, it is amazing at how good the quality is...FOR...the price. I mentioned the webcam adapter didn't I... well I use a simple xbox 360 webcam, the webcam adapter, this barlow lens, a darkening filter, and I can get very satisfying images of what I said I have viewed.I would recommend if you are beginning like me, but please just remember the price and that more expensive will generally equal better quality.Sam

As ever, Seben manage to provide quality performance without the premium price tag. We'd all like to spend money on our hobby, but we can't all afford to pay top dollar for shiny kit. You know what? I do astronomy in the dark, and I care more about looking THROUGH an eyepiece than looking AT it. That said, this is a smart looking Barlow that fits perfectly in the eyepiece holder, and gives a good, clear image doubling. The seeing conditions weren't great when I tested it, but it was obvious that the thing would be just fine when things are less wobbly.Am I glad I bought it? You bet I am. I would recommend Seben/Orbinar astronomy eyepieces to any amateur astronomer who wants to equip themselves without breaking the bank (or annoying their significant other).UPDATE: Clear night, viewing Saturn with this and my Orbinar 6.5 mm Plossl (mag x200 in my scope) - WOW! This is the first time I've managed to see Saturn at x200 and it is simply amazing. My wife was blown away by the sight, as she's never seen it at lower magnifications. I can't wait for Jupiter to come back round in the winter sky again!

La he comprado para un Celestron powerseeker 70AZ (70/700) y va bien. La tengo entre la diagonal amici prisma original que viene con el telescopio y un ocular zoom 8-24 de Seben.Es un conjunto que ha salido mucho más barato que si fueran piezas de otras marcas más conocidas pero ha dado muy buen resultado. La calidad de las imagenes que obtengo quedan por encima de las fotos y videos que veo del mismo telescópio en la internet y dentro de lo que es la apertura de mi telescópio no puedo pedir más asi que satisfecho.Por lo menos para este tipo de telescópios los potencia muchísimo sin gastarte un pastón en oculares. Claro que con la barlow me resulta más difícil buscar, los 24mm se vuelven 12mm, pero por eso he comprado un buscador en 95º de Seben para ahorrar mis espaldas y sustituir el que tengo de 180º de celestron que es muy flojo. Las imagenes de los planetas se ven más grandes sin perder calidad, eso es lo que se pide de la barlow.Ya veis que he apostado por esta marca y de momento muy contento con la relación precio-calidad.

Produit de qualité conforme à la description, reçus avant la date,Rapport qualité / prix très intéressant, et a doublé ma vision de mon mizar 144 \ 900, j'ai bien lu les autre commentaires car je suis débutant et pas dessus du tout, donc pour les termes technique je vais m abstenir ^^, mais pour un 25 mm en observation lunaire très bien

Buon prodotto comprato per Celestron Travelscope 70, compromesso molto buono tra costo e qualità.Fa il suo mestiere egregiamente a costi contenuti.Ottimo prodotto per mia nipote che voleva avvicinarsi all'astronomia e non volevo comprarle un dispositivo giocattolo ma nenache uno troppo costoso che poi poteva rivelarsi eccessivo rispetto alle sue necessità.Non ho avuto problemi ad installarlo.Ragionevole qualità ottica.

Aufgrund der vielen Meinungen und Rezessionen die ich im Internet über diese Linse gelesen habemusste ich sie mir einfach kaufen. Ich habe mir vor einigen Monaten ein Refraktorteleskop vom Penny Marktgekauft (einfach so zum Spaß). Ich habe dafür 69 Euro ausgegeben da ich gelesen habe, dass dievordere Linse eine BK7-Glas-Vergütung haben soll (was sie auch hat). Inventar: Okulare 20mm,12,5mm u. 4mm,eine Barlowlinse (2fache Vergrößerung)und eine Umkehrlinse die nicht funktioniert!Das ganze von der Firma BRESSER. Als ich beim 20mm Okular die mitgelieferte Barlowlinse verwendet habewar ich sehr enttäuscht den Alles wurde dunkler und ich konnte nichts mehr richtig scharfstellen. Jetztkönnte ich das natürlich umtauschen und umtauschen und ..... damit ich vielleicht irgendwann mal zufriedenbin oder nicht. Nein !! Ich habe mir diese neue Barlowlinse gekauft und der Unterschied war "gewaltig"!Mit einem ebenfalls bestellten 10mm Okular von Plössl kann ich die neue Barlowlinse tadellos gebrauchen.Unter 10mm kann ich dann nur mehr Beobachtungen am Tag machen. Fazit: Wer sich ein Kaufhausteleskop unter100 Euro kaufen will und dann diese Barlowlinse + ein gut vergütetes Okular (z.B. Plössl, Skywatcher ... )dazukauft kommt in der Regel nicht über 120 Euro und hat schon als "Einsteiger" was brauchbares in der Hand.Das ist meine Meinung als "Einsteiger"!

Cette Barlow fait bien son travaille et permet de multiplier par 2 virtuellement son nombre de grossissements possibles, sans racheter d'oculaires supplémentaires.Elle est suffisante pour un débutant qui ne veut pas se ruiner dans du matériel haut de gamme qu'il ne saura pas forcément bien exploiter, et donc ne verra pas vraiment de différence à l’œil nu.J'enlève une étoile par ce que cette Barlow n'est pas livrée avec une petite boite de rangement et surtout elle n'a qu'un cache en plastique pour le dessus mais rien pour le dessous.