Levenhuk Ra R90 ED Doublet OTA [3/21] Attaching the ota to a mount

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Telescope assembly

EN

Levenhuk Ra ED Doublet OTA

Congratulations on your purchase of a high-quality Levenhuk telescope!

These instructions will help you set up, properly use, and care for your telescope. Please read them thoroughly before getting

started.

All parts of the telescope will arrive in one box. Be careful when unpacking it. We recommend keeping the original shipping con-

tainers. In the event that the telescope needs to be shipped to another location, having the proper shipping containers will help

Your new OTA has an extremely fast focal ratio that makes it perfect for wide-eld astrophotography, yet it still produces

breathtaking views during visual observations. All optical elements are made of high-quality ED glass with extra-low dispersion

and are fully multi-coated for crystal clear and sharp views across the eld of view with no chromatic aberration. Levenhuk Ra

ED Doublet OTAs may be attached to any mount with mounting brackets (quick-release screw connectors). Levenhuk Ra R120 ED

Doublet OTA is tted with tube rings for this purpose, Levenhuk Ra R110 ED Doublet OTA – with tube rings and dovetail mount.

The 80-mm OTAs may be mounted on a photo tripod.

CAUTION! Never look directly at the Sun – even for an instant – through your telescope or nderscope without a professionally

made solar lter that completely covers the front of the instrument, or permanent eye damage may result. To avoid damage

to the internal parts of your telescope, make sure the front end of the nderscope is covered with aluminum foil or another

non-transparent material. Children should use the telescope under adult supervision only.

in customizing the instrument to your needs. However, certain rules for using accessories still apply. Assembling a nderscope is

very simple:

1. Attach the base (not available in the package) onto the optical tube

2. Loosen the thumbscrew on the base

3. Install the nderscope (not available in the package) onto the base

4. Retighten the thumbscrew

All optical tubes accept 2” accessories (some models may require the use of a corresponding adapter with 1.25” or 2” acces-

sories). Keep in mind, however, that your views will be out of focus without a star diagonal or an extension ring. To install a star

diagonal or an extension tube, simply loosen the thumbscrew on the side of the focuser, insert the accessory, and retighten the

thumbscrew. Afterward, you can insert the desired eyepiece into the already attached star diagonal or extension ring.

Focusing

During celestial observations, out-of-focus images of dim stars may be very diffuse, making it difcult to focus on such objects.

Choose a brighter celestial body (such as the Moon) as your rst observation object, and focus your view. With a 10:1 ne focus

adjustment (meaning that 10 turns of the ne focus knob equal 1 turn of the coarse focus knob), you can adjust the focus of your

view with great precision. Use the coarse focus knob to adjust the view until your object is as close to focus as possible, and then

make ne adjustments with the ne focus knob.

Eyepieces and magnication

An eyepiece magnies the image produced by the OTA. The longer the focal length, the lower the eyepiece magnication, and

vice versa. Therefore, it is recommended to have several eyepieces in your equipment. The total power of the telescope setup

may be calculated with the following formula: