This high performance Antares barlow # UB3STL triples the power of any inserted eyepiece. It features a fully-multicoated achromatic design. This short barlow will work in diagonals or reflectors, has internal darkening and edge-blackened lenses, and is parfocal with most eyepieces. It features a clear aperture of 27mm. Suitable for high contrast, high power applications in any telescope. Made in Canada.
This new version of Antares' popular UB3S barlow features an integrated twist-lock adapter / clamping mechanism to securely center and hold your eyepiece. The inner compression ring is made of polypropylene and will not mar your eyepieces. Unscrewing the twist-lock ring exposes a standard male T-thread (M42x0.75) underneath which can be used to couple imaging devices with the barlow.
- Barrel size: 1.25" / 31.7mm
- Magnification factor: 3x
- Type: Achromatic
- Coatings: Fully multicoated
- Clear aperture = 1.01" / 25.7mm
- Weight: 5.5oz / 156g
- Total length: 3.31" / 84mm
- Length of lower chrome barrel: 1.52" / 38.5mm
- Length of upper black barrel: 1.79" / 45.5mm
- Filter threads: No
- End caps: Yes (2) but subject to change without notice
- Country: Made in Canada
Note that the use of any optical element like barlows and focal reducers changes the focus point of your telescope, requiring additional in-focus or out-focus travel. The exact amount of focus travel required will depend on the optics and mechanics of your specific set-up (telescope, diagonal (if used), barlow, and eyepiece). Hence, be aware that you may not be able to reach focus with all eyepieces or in all configurations with a given barlow.