New model with twist lock adapter instead of set-screws.
For observers who want to power-up their 2" eyepieces, the Antares model 2UBSTL barlow lens with twist lock offers a 1.6x increase in magnification and reduced spherical aberration with all oculars. With a clear aperture of 1.64" (41.8mm) and a short length tube, this fully multicoated achromatic design will work with telescopes with the 2" format, including those using a 2" diagonal.
This new version of Antares' popular 2UBS 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.
Features edge-blackened elements, and internal baffling. When used with a diagonal, this barlow will provide approximately 2.4x if placed before the diagonal or 1.6x if inserted into the diagonal.
- Barrel size: 2" / 50.8mm
- Magnification factor: 1.6x
- Type: Achromatic
- Coatings: Fully multicoated, Blackened lens edges
- Clear aperture = 1.64" / 41.8mm
- Weight: 9.2oz / 261g
- Total length: 2.87" / 73mm (+/- 2mm depending on exact position of clamping stop)
- Length of lower chrome barrel: 1.16" / 29.6mm
- Length of upper black barrel: 1.71" / 43.4mm
- Maximum width = 2.35" / 59.8mm
- Filter threads: Yes (Standard 2" filter threads, M48x0.75)
- End caps: Yes (1 - lower only) but subject to change without notice
- Country: Assembled in Canada using Japanese optics
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.
Please note: A couple of tiny dust particles between lens elements, uneven lens edge blackening, very minor coating blemishes, or even a very small fine lens scratch or two are very common in this Antares product and must be accepted as normal. However, these will not impact optical performance.