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Howie Glatter 2.0" to 1.25" Eyepiece Centering Adapter
The Howie Glatter 2.0" to 1.25" Eyepiece Centering Adapter addresses the critical issue of optical alignment with a patented two-line contact system that prioritizes axis parallelism over simple centering. This adapter converts your 2" focuser to accept 1.25" accessories with zero in-focus loss, features threads for 48 mm filters, and won the Sky & Telescope Hot Product award in 2012. Its unique design uses a non-marring thumb screw set at 45° to ensure your eyepiece and drawtube axes remain perfectly parallel, eliminating the tilt that can degrade image sharpness and collimation accuracy.
Patented Two-Line Contact for Axis Parallelism
Many adapters focus on centering an eyepiece, but even a small angular tilt of a few arc minutes can introduce significant optical errors. The Parallizer solves this by clamping your 1.25" accessory between two parallel straight edges, creating two lines of contact. This patented method guarantees the optical axis of your eyepiece, laser collimator, or camera remains perfectly parallel to the axis of the focuser drawtube, which is what matters for collimation tools and camera adapters.
Zero In-Focus Loss and 48mm Filter Compatibility
The Parallizer is engineered with a "zero height" profile, meaning it consumes no additional in-focus travel. This is important when little in-travel is left. The adapter is also threaded to accept standard 48 mm (2") filters, allowing you to attach a nebula or light pollution filter to the adapter itself, where it will be secure and out of the way of any 1.25" accessory barrel you insert.
Precise Setup with the 45° Clamp Screw
To achieve the designed parallelism, proper setup is key. The adapter should be inserted into the 2" focuser so that the focuser's locking screw presses against the smooth barrel, opposite the Parallizer's external undercut. When you insert a 1.25" eyepiece, the Parallizer's own nylon-tipped clamp screw, set at a 45° angle, pushes the eyepiece down and firmly against the internal parallel contact lines. This controlled, non-marring action ensures a rigid and perfectly aligned optical train.
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Single-Screw Use: Use one, and only one, focuser thumb screw to secure the Parallizer. If the focuser has a brass split ring, center it on that screw. Always place the Parallizer's screw opposite the focuser screw.
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Focuser Compatibility: This adapter is not recommended for use with click-lock style binders, as their clamping mechanism may interfere with the Parallizer's self-aligning function.
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What makes the Howie Glatter Parallizer different from a standard 2" to 1.25" adapter?
A standard adapter may center an eyepiece, but often introduces a slight tilt. The Howie Glatter Parallizer uses a patented two-line contact system that forces the eyepiece's optical axis to be perfectly parallel with the focuser's axis. This parallelism is more critical for sharp, high-contrast views and accurate collimation than perfect centering.
How do I correctly install the Parallizer adapter in my 2" focuser?
For correct alignment, follow these steps: 1. Insert the Parallizer so its outer undercut is on the opposite side of the focuser's locking screw. 2. Use only one focuser screw to tighten the adapter. 3. Insert your 1.25" accessory. 4. Tighten the Parallizer's own thumbscrew. This should be positioned opposite the focuser screw you used in the first step.
Will the Parallizer work with my Newtonian telescope that has limited focuser travel?
Yes. The Parallizer is zero height, so extra in-travel of the focuser is not needed, which matters when little in-travel is left.
Can I use 2" filters with the Howie Glatter 2" to 1.25" adapter?
Yes. The Parallizer is threaded for 48 mm (2") filters and is long enough that 1.25" barrels will not hit the filter.
Why isn't the Parallizer recommended for click-lock focusers?
Click-lock binders may not tighten down correctly on the outside of the adapter and may defeat its self-alignment feature.
Will the Parallizer's clamp screw damage my 1.25" eyepieces?
No. The Parallizer uses a nylon-tipped thumb screw for clamping. This non-marring material provides a secure grip without scratching or denting the chrome or anodized barrels of your 1.25" eyepieces and accessories.
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| Type |
Parallizer 2" to 1.25" eyepiece adapter |
| Telescope Side |
2" barrel (fits 2" drawtubes) |
| Accessory Side |
1.25" clamp with non-marring nylon-tipped thumb screw set at 45° |
| Filter Thread |
48 mm (2") filters |
| In-Focus Loss |
Zero (zero height) |
| Alignment |
Patented Parallizer two-line contact keeps accessory and drawtube axes parallel |
| Award |
Sky & Telescope Hot Product 2012 |
| Camera-Side Connection |
1.25" barrel clamp |
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Parallizer 2" to 1.25" adapter
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Howie Glatter Warranty
