Celestron Luminos 2.5x 4-element Barlow for 2" and 1.25" eyepieces


Availability: In stock

This 2.5x Celestron Luminos four-lens fully multicoated Barlow provides superb field flatness and minimal chromatic aberration with both 2" and 1.25" eyepieces . . .
Our Product #: CLUM25X
Celestron Product #: 93436

Product Description

This 2.5x magnification Celestron Luminos 2" Barlow uses a four-lens fully multicoated optical system to provide a flat field and apochromatic-quality spurious color free optical performance. Affordably-priced, it is optically corrected for use with any eyepiece type and telescope combination and comes with an adapter to allow you to use either 2" or 1.25" eyepieces.

In addition to full multicoatings, the Celestron Luminos Barlow has blackened lens edges and internal antireflection threading to virtually eliminate internal reflections. This assures high contrast images when observing bright targets, such as the Moon and planets. A 28mm clear aperture minimizes vignetting, even when used with wide angle 2" eyepieces.

The 2" barrel of the Celestron Luminos Barlow is threaded to accept standard 2" color and light pollution filters. Its compact 3.66" length (with the 1.25" adapter) allows you to use it comfortably in star diagonals. It is only 3.15" long when the 1.25" adapter is removed for use with 2" eyepieces.

Non-marring brass compression rings with large thumbscrews hold your eyepieces securely in place in both the 2" barrel and the 1.25" adapter without marring the eyepiece barrels as an ordinary Barlow thumbscrew can. There's a broad rubber grip ring for a firm hold while handling the Celestron Luminos Barlow while wearing gloves in cold weather. The Luminos Barlow comes in a soft vinyl drawstring pouch for storage.

Tech Details

Barrel Size 2"
Length 3.66"
Number of optical elements 4
Power 2.5x
Weight 11 oz.
Warranty 2 years


Review by:
Bought this for my 8" newt. Works great on my scope. Well worth the price asked. Still trying to use it for my astrophotography, no rel distortions noted, Bring my scope to f/12 -- not quite enough for planets - need longer focal length (Posted on 8/14/2019)
Review by:
The Celestron 2.5X barlow produces clear images with no noticeable reduction in brightness. I like that it can be used with both 1.25" and 2" eyepieces. The build quality seems excellent. I would recommend this product. (Posted on 8/14/2019)
Review by:
I was not expecting much when I bought the 2.5x Luminos barlow. However, it proved to be a pleasant surprise. The barlow is extremely well baffled and blacked on the interior and is very light for a 4 element barlow. It provides sharp views and no vignetting with eyepieces I used it with. The sky background remains nice and black with this eyepiece and there is no glare when using it on the Moon and planets. If you are looking for a light 2" barlow to use with some of your 2" eyepieces the 2.5x Luminos barlow is a quality option. (Posted on 7/25/2019)
Review by:
This is great for planetary observation with 2inch lenses. Sadly, the bottom does not unscrew for use in AP light trains, allowing sag at the slip connection. Only one set screw makes this problem even worse. (Posted on 7/22/2019)
Review by:
you just have to find the sweet spot and rotate it a bit to make sure it locks in place (Posted on 12/29/2018)
Review by:
I use this barlow on my Celestron C8, very clear and bright, doesn't mark up my eye pieces, and gives me a nice boost of power with my Nexstar Burst. (Posted on 11/4/2018)
Review by:
Bought this to use with my 10" Meade Lightbridge. Works very well with all of my eyepieces. I would buy this again if it ever became damaged or lost. (Posted on 10/7/2018)
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