Levenhuk Ra 200N F4 Carbon OTA [4/22] Batteries safety instructions

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Batteries safety instructions

Operating the telescope

• Always purchase the correct size and grade of battery most suitable for the intended use.

• Always replace the whole set of batteries at one time; taking care not to mix old and new ones, or batteries of different types.

• Clean the battery contacts and also those of the device prior to battery installation.

• Make sure the batteries are installed correctly with regard to polarity (+ and -).

• Remove batteries from equipment that is not to be used for an extended period of time.

• Remove used batteries promptly.

recommended using high-quality eyepieces for visual observations to achieve exceptional quality of produced views.

Cooling Fan

Your new reector comes with a cooling fan built into the rear end of the optical tube. This fan reduces the time it takes the

primary mirror to adapt to the outside temperature. This eliminates fogging, and your OTA will produce sharper and brighter im-

ages as a result. The fan is powered by 8 AA batteries (not included in the kit), or an external 12V battery. Please allow addi-

tional time for cooling if there is a substantial difference between the indoor and outside temperatures. Once the telescope has

adapted to the outside temperature, you can turn off the cooling fan to reduce vibration of the optical tube.

Visual observations

To achieve focus, you will likely have to use the included 35-mm extension ring. Just insert it into the focuser and tighten the

two thumbscrews to secure the extension ring in place. You can then use either a 2” eyepiece or a 1.25” eyepiece (with a 1.25”

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.

Astrophotography

Levenhuk Ra reectors have high-quality BK-7 glass optics, which produce bright images and provide for fast exposure. However,

fast optics also inherently produce some coma, so to achieve the best possible images, it is recommended to use a coma correc-

tor (not included in the kit). The coma corrector may be attached to the focuser in front of the camera body. Coma correctors

eliminate coma and improve the quality of the resulting images across the eld of view, so you do not have to crop the images

with the two thumbscrews.

Model Levenhuk Ra 200N F4

Carbon OTA

Levenhuk Ra 200N F4

OTA

Levenhuk Ra 200N F5

Optical tube material carbon ber metal

Optical design Newtonian reector

Primary mirror diameter

(aperture), mm

Focal length, mm 800 800 1000 1000

Focal ratio f/4 f/4 f/5 f/4

Optics material BK-7 optical glass

Tube weight, lbs / kg 13.8 / 6.3 16 / 7.3 18.2 / 8.3 29.3 / 13.3