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Low Profile Adapters for Unitron - Polarex

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#1 xavier

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Posted 09 April 2013 - 05:12 PM

Hello,
Just back from the Netherlands where I picked up a set of 5 different low profile adapters for my Polarex refractors.
The idea for the design was to put modern accessories on this classic scopes. The adapters are made from high quality aluminum and black anodized.

The adapters are for the two sizes draw tubes. The small ones that fit the smaller and the Deluxe Focusers and the large ones that fit the Super Focuser on the larger Unitron scopes.

The adapters needed to be low profile because you need a lot of in travel for the modern eyepieces.

There are to adapters for the small draw tubes. One for 1.25" accessories and on for T2 cameras and diagonals.

For the large draw tubes there are 3 adapters. For the 1.25" diagonals, the 2" diagonals and T2.

If possible they are threaded for filters.

Mechanically they fit perfect. Need to test them under the dark sky.

Xavier

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#2 xavier

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Posted 09 April 2013 - 05:12 PM

The 2" adapter on the large draw tube

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#3 xavier

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Posted 09 April 2013 - 05:14 PM

The T2 adapter on the large draw tube holding a Canon dslr.
Can also be used with a webcam. Is threaded for filters or the AP Barcon.

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#4 xavier

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Posted 09 April 2013 - 05:15 PM

The T2 adapter for the large draw tube with the Baader T2 diagonal and the Denkmeier II Bino on the 4" Polarex

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#5 R Botero

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Posted 10 April 2013 - 06:35 AM

Xavier

This is great. When you say "pick up", did you have them made? Can more be made? There was a question in the Yahoo Unitron group recently about this. At the moment, I am using the top part of an old barlow (which has a locking screw), sliding into the drawtube of my 75mm Polarex and using masking tape to be sure it wont fall off when using newer eyepieces or a webcam for solar and planetary imaging.

Roberto

#6 xavier

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Posted 10 April 2013 - 09:54 AM

Hi Roberto,

I designed the adapter and ordered them at a professional telescope maker in Holland.

Yes we can make more adapters. If there are enough orders (to reduce the price) we start a small production.

It would be a great solution for your problem.

Xavier

#7 R Botero

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Posted 10 April 2013 - 10:15 AM

Xavier

I would be interested. There was a similar query raised at the Unitron Yahoo group as I mentioned above. Many members of this forum are also members of that group. Are you as well? I have had parts machined locally but I'm open to all options! :)

#8 xavier

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Posted 10 April 2013 - 10:37 AM

Roberto,

I'll post the adapters in the Yahoo group.

Xavier

#9 xavier

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Posted 11 April 2013 - 01:00 AM

There are already 3 people who would like to order the small 1.25" adapter. We will start production if we have 10 orders.
Contact me if you're interested in this adapter
Xavier

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#10 AllanDystrup

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Posted 11 April 2013 - 06:09 AM

Xavier,

I assume that you unscrew your current 0.965/1.25" visual backend, and then insert the adapter directly in the Unitron drawtube, and that the 1.25" accessory is then secured by the screw.

How is the adapter secured in the drawtube ? Is it threaded into the tube -- or just a tight fit ?

Allan

#11 xavier

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Posted 11 April 2013 - 09:05 AM

Hi Allan,

Yes, you unscrew the original Unitron 0.965/1.25" adapter from the drawtube and screw the new adapter in place.

It was difficult to find the right threat that fits all the drawtubes. We measured 15 different drawtubes from different periods and they all have a slightly different diameter. Most of the old drawtubes aren't round. We measure to 1/100 of a mm.
We now have the right threat that fit all of the drawtubes. Not to loose and not to tight. Once the new adapter is screwed to the end it's really loctite.
The adapters can hold really heavy accessories without any problem.
Xavier

#12 AllanDystrup

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Posted 11 April 2013 - 09:40 AM

Right, I just scanned your pictures at the Yahoo Group, and could see the unitron thread on the telescope end :-)

Great initiative Xavier, and once again : thanks for sharing :-)

Allan

#13 xavier

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Posted 29 April 2013 - 09:31 AM

We're ready to start the production of the eyepiece adapters for the Unitron telescopes.

We will inform the people who ordered adapters about the shipping.


Warm regards,
Xavier

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#14 R Botero

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Posted 29 April 2013 - 01:14 PM

Hooray!






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