D RR Merkur 910 Achromatic Refractor Telescope Instruction Manual

D RR Merkur 910 Achromatic Refractor Telescope

THANK YOU very much for choosing a quality product from DÖRR. Please read the instruction manual and the safety instructions carefully before using the device for the first time. Keep this instruction manual together with the device for later use. If other people use this device, provide them with this instruction manual. If you sell the device, the instruction manual is part of the device and must be supplied with it. DÖRR is not liable for damage caused by improper use or failure to observe the instruction manual and safety instructions. In the event of damage caused by improper handling or by external influence, the guarantee or warranty becomes void. Manipulation, structural alteration of the product, as well as opening the housing by the user or unauthorized third parties, is considered improper handling.

NEVER look at the sun through the telescope or view under! Risk of blindness!

SAFETY INSTRUCTIONS

ATTENTION! The following safety instructions must be observed before use:

NEVER look directly at or near the sun through this telescope or through the viewfinder! There is a risk of blindness! The telescope is not a toy! Children must not use the telescope without adult supervision. Keep the telescope, accessories, and packaging materials away from children and pets to prevent accidents and su location. People with physical or cognitive disabilities should operate the telescope under guidance and supervision. Please note that light shining through the eyepiece is highly focused and can generate a great deal of heat. Therefore, make sure that the telescope is not pointed at easily flammable materials. After use, please attach the protective eyepiece cap.

• Protect the telescope from rain, moisture, direct sunlight and extreme temperatures.
• Make sure that the telescope is placed on a solid surface so that it cannot tip over.
• Protect the telescope from impacts. Do not use the telescope if it has been dropped.
• If the telescope is defective or damaged, do not attempt to disassemble or repair the telescope yourself. Please contactyour specialist dealer.
• Protect the telescope from dirt. Do not clean the telescope with petrol or harsh cleaning agents. We recommend using a lint-free, slightly damp microfibre cloth to clean the outer components of the telescope.
• Store the device in a dust-free, cool, dry place.
• This telescope is for private use only and is designed for observing nature and the sky.
• Respect the privacy of others: do not use this telescope to look into other people‘s homes.

DISPOSAL
Please dispose of old appliances and packaging in an environmentally friendly manner and according to type. Sorting waste for separate collection and sensible recycling of packaging waste helps to use natural resources more sparingly. Furthermore, recycling is a contribution to preserving our environment and thus also people‘s health. Further information on the current legal regulations, proper disposal, recycling and collection points can be obtained from local authorities, waste disposal companies and specialised retailers.

NOMENCLATURE

• 1 Telescope Tube
  2 Lens Front Cover
  3 Finderscope
  4 Support for Finderscope
  5 Fixing Screws for Finderscope
  6 Eyepiece
  7 Eyepiece Mount
  8 Diagonal Prism
  9 Height Fine Adjustment
  10 Focus Wheel
  11 Azimuth Mount
  12 Locking Screws for Height Fine Adjustment
  13 2 Wing Screws o connect the Telescope to the Mount
  14  Mount Base with Tripod Connection
  15 Locking Screw for Horizontal Movement
  16 3 Fixing Screws with Washers for Tripod Connection
  17 Wing Nut for 16
  18 Extendable Tripod Legs
  19 Fixing Screws for Tripod Legs
  20 Brackets to fi x the Tripod Tray
  21 Tripod Tray
  22 Screws with Washers for 21 + 20
  23 Wing Nuts for 22

SPECIFICATIONS

= 45,5x (91x*)**

*with 2-times barlow lens

Tube length| approx. 50 cm
Weight| approx. 2,7 kg

SCOPE OF DELIVERY

• 1x Finder scope 5×24

• 3x Eyepieces SR4, H12.5, H20

• 1x Barlow lens 2x

• 1x Erect image eyepiece 1,5x

• 1x Moon fi lter

• 1x Diagonal mirror 90°

ASSEMBLY INSTRUCTIONS

The Merkur 910 is supplied in one carton. The components are packed in various inner cartons. The tripod legs are individually packed and stowed below the other cartons.
Note! The loose metal brackets (20) must points towards the inner side.
All 3 screws (16) + (17) at the tripod head/mount base (14) should mount into the same direction. Now unpack the tripod tray (21) and the screws with washers (22) and wing nuts (23). Place the tripod and mount in front of you. Connect one edge of the tripod tray (21) with one of the brackets (20) by sliding the bracket below the tray and use 1 set of screws & nuts (22) + (23) to fi x it smoothly. Repeat the procedure with the 2 other edges of the tray. Correct the fi xings in a way that the tripod will stand even. Then fi rmly fi x the tray (21) to the tripod. Afterwards fi x the screws (16) at the tripod head/mount base (14). A small triangle metal plate supplied with the accessories serves ideally as a screw driver. Prepare the telescope mounting by fi xing the locking screw (15) tightly so that the mount won’t rotate.

MOUNTING THE TELESCOPE
Unpack the telescope tube (1) thoroughly and remove the protection cover. For the time being leave the covers at the lens (2) and at the eyepiece mount (7). Both at the left and right side within the tube there are screw mounts with 2 wing screws (13). Remove these wing screws. At the right hand side of the mount there is a chrome-plated screw (12). Unscrew it until the round opening in the lower fixed chrome-plated part becomes fully free. Lift the telescope tube (1) over the mount (11). The bracket must be tilted backwards. At the right hand side of the telescope tube there is a chrome-plated bar (9). Slide this bar into the opening described at the lateral chrome-plated screw at the right side of the mount (12). Position the telescope tube onto the mount bracket in a way that the two screw mounts match exactly with the openings of them mount. Now screw the wing screws (13) through the bracket into the telescope tube screw mounts. Fix the screws evenly while the telescope is in horizontal position. Also fi x the chrome-plated screw (12) at the right side of the mount. Now the two screws (13) at the telescope and the screw (12) serve for the height adjustment of the telescope. For fi ne adjustment you can also use the fi ne adjustment bar (9) by turning its socket union back and forth.

MOUNTING THE FINDERSCOPE
Unpack the Finderscope (3) and its support (4). At the rear top end of the telescope there are two chrome-plated screws (5) for the fi nderscope bracket. Unscrew these and fi x the support (4) at the screw mounts. For proper direction make sure that the smaller part of the fi nderscope (ocular side) points to the rear end of the telescope. Now fi x the screws (5) at the telescope tube. Fix and adjust the fi nderscope using the 3 small screws around the support (4). (For details refer to section Adjusting the Finderscope).
EYEPIECES AND ACCESSORIES
First remove the lens cover (2) at the telescope tube (1). On top of the cover, there is another small lid. If you only remove the small lid, you can reduce the incidence of light. Now also remove the cover of the eyepiece mount (7). When you do not use your telescope, make

EYEPIECES

3 eyepieces with a diameter 1 (31.5mm) are included:

• SR4 = 227,5x (455x*)
• H12.5 = 72,8x (145,6x*)
• H20 = 45,5x (91x*)
• with 2-times barlow lens

HOW TO CALCULATE THE MAGNIFICATION FACTOR

The magnifi cation factor calculates very simply as follows:

Take the eyepiece H20 with the smallest magnification. Insert the eyepiece (6) into the eyepiece mount (7) and tighten it using the 2 small outer screws. Now you can start your observations.

CAUTION!
Observations of the sun are extremely dangerous. Do not use this telescope for sun observation. The optical elements have the OF ects of a burning glass and will blind you! The ideal way to make safe sun observations is the usage of a special sun fi lter foil, which is fi xed at the front end of the telescope. The foil absorbs 99.9% of the sunlight.

STARTING OBSERVATIONS

Direct your telescope at daylight to a known object (house, church, tree or mountain). For the height adjustment of your telescope, loosen the screws (13 and (12). The lateral adjustment can be done with the small chrome-plated screw (15). Make sure to hold the telescope fi rmly, while you make these adjustments. Aim your desired object through the telescope and tighten the mentioned screws again. Your object will be visible up-side-down and reverse which is caused by optical e ects. Under astronomical consideration, there is no “top” and “bottom”.

FOCUSING

Turn the focus wheel (10) at the rear side of the telescope forth and back to focus your object properly. The adjustment will vary according to the distance of the object and depending on the usage of diFFRIENTerent components

ERECTING EYEPIECE FOR TERRESTRIAL OBSERVATIONS

To correct the reverse image, the supplied erecting eyepiece 1.5x can be used. It comes with 1 side 1⁄” outer dia. and 1 side 1⁄” inner dia. Insert the smaller part into the eyepiece mount (7) and fi x it using the two small screws of the eyepiece mount. Insert your eye-piece H20 at the other side of the prism and fi x it with the small screws as described for the eyepieces earlier. This combination achieves a magnifi cation of 45 x 1.5 = 67x. You can now start observation as usual. 11 |

DIAGONAL PRISM 90°
A rectangular diagonal prism is included in this telescope package. It comes with 1 side 1⁄” outer dia. and 1 side 1⁄” inner dia. It mainly serves for zenith observations and hereby allows a lateral view of 90°. So you don’t have to stand behind or under your telescope. Insert the smaller part into the empty eyepiece mount (7) and tighten the screws. Now insert your eyepiece H20 into the diagonal prism. The image will now be upright, but still reverse. The magnification does not change.

BARLOW LENS
The 2x Barlow lens expands the original magnification of your eyepieces (6) by factor 2. To insert it, follow the instructions of the erecting eyepiece. Observe and adjust as usual.

RECOMMENDATION

We recommend starting your observations always with small magnification. This guarantees you a wider fi eld of view and you can recognize and focus your objects faster. The larger the magnification, the field of view decreases and you risk blurred images. The celestial objects will move faster out of the range of your telescope and you have to track more often.

MOON FILTER

Your telescope accessories include a moon fi lter. It provides observations of the full or light moon in rich contrasts. The moon fi lter is screwed into the eyepiece, when required.
CAUTION: DO NOT USE THIS FILTER AS A SUN FILTER!

ADJUSTING THE FINDERSCOPE

For daylight observation we recommend to use your telescope in combination with the eyepiece H20 (45x) only. Direct the telescope to a far-distanced object and adjust a particular part of your object (church tower, top of a tree of crane, TV antenna) in the center of your field of view. Now look through your fi nderscope which provides a reverse and up-side-down image. Open the 3 screws of the support (4) slightly and direct the reticle of your finderscope towards the center of your object. Tighten the 3 screws with care, making sure that the reticle stays in the center of the image. Your finderscope is adjusted now. It has a far larger field of view than your telescope and helps you to direct your telescope towards your desired objects which you can observe then through your telescope with a smaller fi eld of view.

CAUTION: DO NOT AIM THE SUN WITH THE FINDERSCOPE. YOU EYES CAN BE SERIOUSLY DAMAGED.

FURTHER HINTS FOR ASTRO OBSERVATIONS

Observe outdoors only, but not through a window. Train the hand movements a few times at daylight. In case of temperature different erences between inside and outside, the telescope must get used to the predominant temperature in order to avoid fogging. Adopt yourself and your eyes to the darkness in advance. To clean the optical surfaces make sure to use appropriate fuzz-free optical tissues. Remove the dust with air pressure or a blow bellow. Avoid strong rubbing. We recommend studying specializing literature on astronomy and celestial observations. Enjoy your observations with your DÖRR Merkur 910 Telescope!

Messerschmittstr. 1

• D-89231 Neu-Ulm
• Fon +49 731.970 37 69
• info@doerr.gmbh.
• www.doerr-outdoor.de.
• doerr-o2u2tdoor.de.

References

• Dörr Outdoor

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