PrimaLuceLab - OnAxisLock 50.8mm Visual Back for SC Telescopes

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$72.99

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The PrimaLuceLab OnAxisLock 50.8mm visual back for SC telescopes is directly screwed onto the back thread common in most Schmidt-Cassegrain telescopes (like the SC and EdgeHD by Celestron or Meade) and lets you use all the 50.8mm diameter accessories.

SKU: PRI-OAL508SC
Manufactured by:
PrimaLuceLab
 

Product Description

PrimaLuceLab OnAxisLock 50.8mm Visual Back for SC Telescopes

The PrimaLuceLab OnAxisLock 50.8mm visual back for SC telescopes is directly screwed onto the back thread common in most Schmidt-Cassegrain telescopes (like the SC and EdgeHD by Celestron or Meade) and lets you use all the 50.8mm diameter accessories.

OnAxisLock is the accessories locking framework that, compared with the one using typical screw, offers a superior clamping force, avoiding any possible flexure (so it's ideal for astro-imaging), it doesn't harm the connected accessory and it perfectly centers the optical axis of the telescope. All credit goes to a new locking device with a double ring: just turn manually the appropriate external ring (designed to allow an easy grip, even with gloves) in order to obtain a perfect closure!

During use of heavy imaging instruments like DSLR or cooled CCD cameras (often with filter wheels), it's vital to avoid flexures when we insert them into the telescope's focuser. This is also crucial for visual use using large mirror diagonals and wide field eyepieces (which are often very heavy).

That is the reason PrimaLucelab designed the OnAxisLock adapter that replaces the classic screw with a locking ring mechanism. This permits you to perfectly bolt the inserted accessory by turning the external ring (red): a special double ring tightens internal accessories with an uniform pressure. The OnAxisLock device also allows you to keep perfectly aligned the accessories inserted in the focuser: so you will be sure that your camera's sensor will be perfectly centered with the optical axis of the telescope.

Left: 31,8mm original eyepiece holder of ah EdgeHD 8" by Celestron
Center: OnAxisLock 50,8mm adapter for SC threaded on the rear thread instead of the original visual back
Right: OnAxisLock 50,8mm adapter for SC with 31,8mm OnAxisLock adapter

 

 

The special design of the outer ring has been developed to allow you to lock the accessory with ease, even when wearing gloves. This way you can be sure to safely lock your CCD camera or your eyepiece even when the cold is intense.

Specifications

Name PrimaLuceLab - OnAxisLock 50.8mm Visual Back for SC Telescopes
Manufacturer PrimaLuceLab
Model PRI-OAL508SC
EAN 8059020771119

Reviews

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Your 2-inch SCT diagonal (with adapter to use with refractors) will not rotate toward the ground with your next slew. Even at a 90-degree angle. With a 36mm 2-inch Hyperion eyepiece attached. You can adjust it at angle you wish to observe and it will hold just nicely. It will not move from the position in which you adjusted it. Used in conjunction with the PrimaLuceLab 31.8mm (1.25 inch) eyepiece holder (Model #OAL318 - this is a 2 inch to 1.25 inch adapter) offers the same rock-solid stability.

If you do any outreach, this will bring you some peace of mind. No more twisty diagonals, no more eyepieces nearly on the ground. You can safely turn this down (or up) to an angle comfortable for you or the viewer. People who feel the need to grab the eyepiece as they look through the telescope will not twist the diagonal and dump your eyepieces onto the ground. Build quality is solid and easily 5 stars.

For value I had to rate it at 4 stars. While it is cheaper than the Baader Click-Lock, it is priced as much as a serviceable diagonal, which is a little much for having only one function. Of course "value" is highly subjective. For someone with $4,000 worth of imaging equipment or who is 3 hours into a deep sky shot, $90 for this peace of mind is probably a bargain. I just do planetary imaging so this is more of a luxury for me than anything else, and my value rating is based on that. (Posted on 5/18/2016)
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