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1. Ta i A a aa il COLLIMATING SET SCREWS SEMI RIGID STEM CLUTCH DIMPLES Clutch friction here Figure 8 Functional components of a Protostar mount mirror When doing the first collimation of a newly assembled telescope its almost always necessary to repeat these steps several times If repeating the process is necessary always go back and repeat steps 1 through 3 in order Consult the instructions that came with your collimation tools on how to use them Center the secondary under the focuser To move the secondary closer to the primary mirror first loosen counterclockwise the tensioning nut a half turn and then tighten clockwise the three collimation screws until you feel resistance make sure they remain aligned with the clutch dimples Repeat as necessary To move the secondary away from the primary mirror first loosen counterclockwise the three collimation screws by about one turn each and then finger tighten clockwise the tension nut until it is snug Repeat as necessary Positioning the secondary axially may take several repetitions but keep in mind you only need to do this for the very first collimation Subsequent collimation will go much faster Lateral centering adjustments i e 90 degrees to the axial adjustments is accomplished by either tilting the focuser with shims Some focusers have built in
2. in an interference fit with the metal shroud which will optically distort the mirror If your mirror doesnt seem to fit inside the shroud properly you should glue it in place Protostar mirrors are CNC machined to the correct size to prevent this problem Method 1 Install the Secondary Mirror With the Shroud Lay the foam mirror pad paper side down and mirror in place on the diagonal head face Slip the shroud onto the diagonal holder and loosely install the shroud retaining screws Position the shroud onto the mirror until the tabs lightly contact the mirror surface Do not push the shroud too tightly against the Figure 6 mirror or you may deform the Mirror mounted optical surface Tighten the with shroud shroud retaining screws The final installation should look like Figure 6 Method 2 Install the Secondary Mirror With Adhesive The secondary mirror can be glued directly to the face of the Protostar holder as long as there is a small gap left between the back of the mirror and the holder face Your kit includes three small spacer washers PLASTIC SPACERS y ae o 4 A b T a SILICONE ADHESIVE DOLLOPS Figure 7 Spacer and adhesive layout for this purpose Glue the three plastic spacers to the holder near the edge as in Figure 7 After the spacers are in place glue the secondary mirror on Use silicone adhesive only These are commonly available from hardware stores GE S
3. E PENCIL MARKS ON THE END OF THE TUBE WHERE THE BRACKET NOTCHES ARE Figure 2 Marking the bracket centerlines Step 2 Mark the bracket centerlines on the tube Using a straight edge draw two pencil lines down the outside of the tube starting at the marks you made in the previous step The lines need to be long enough to go past the focuser base by an inch or two as shown in Figure 3 Step 3 Apply the drilling template Tape the paper drill template to the tube as shown in Figure 4 Align the template s long axis with one of the lines you just drew on the tube By sight line up the centerline that corresponds to your secondary mirror holder s size with the center of your focuser drawtube ere Z P PARALLEL PENCIL LINES Figure 3 Drawing the bracket centerlines on the tube W A ALIGN THE APPROPRIATE LINE FOR YOUR SECONDARY HOLDER SIZE WITH THE CENTER OF YOUR FOCUSER Figure 4 Using the paper template to lay out the bracket holes Step 4 Drill the bracket mounting holes Mark the bracket hole positions and drill using the supplied drill bit Repeat Steps 3 and 4 for the second bracket Step 5 Mount the brackets to the tube Install the mounting brackets using the 8 screws and flange nuts but do not fully tighten the nuts Step 6 Permanently install the arch to the brackets Remove the 6 screws holding the arch to the brackets and remove the arch Note that the bracket
4. P lt gt Curved Secondary Mount a Installation Instructions and User Manual General Information HOLDER ASSEMBLY cae a ARCH ASSEMBLY COLLIMATION ADJUSTMENT TOOL amp 3 16 DRILL BIT MOUNTING BRACKETS BP 8 SCREWS amp FLANGE i a 6 SCREWS a u crunce WH spacer o NUTS Kit Contents Protostar curved secondary mounts are designed to eliminate diffraction spikes by removing straight edges obstructing the aperture The 180 angle of bend symmetrically spreads diffracted light rendering it nearly invisible The thin arch material about 0 6 mm thick in most places and short path length produces the owest total diffraction of any curved design The total diffraction for the Protostar curved mount is about the same as our 4 vane spider Design Features a Tapered width arch The efficient double cantilever design keeps the arch thin and lightweight a Laminated metal arch construction Larger arch sizes are laminated sheets of stainless steel which increases rigidity while keeping thickness to a minimum a Fully adjustable arch design The mounting brackets permit fine positioning adjustments of the secondary mirror within the tube as well as secondary offset Rev 2 13 For solid tube telescopes up to 15 0 inside diameter Before you start Remove all optics from the telescope To prevent damage to your optics from falling parts and tools remove the prima
5. ilicone lI Dow Corning 733 Devcon Silicone Rubber etc It s best to use a fresh tube as there is a catalytic component that evaporates with time Make sure both the mirror and holder face are clean and oil free Let the adhesive cure for 24 hours in a room temperature environment Step 9 Install the secondary holder to the arch Turn the hub collimation screws clockwise until they protrude by about 1 8 2 mm Insert the secondary holder into the hub on the arch and visually ensure that the three collimation screws are engaged into the dimples on the clutch disk The dimples prevent the mirror holder from rotating when you turn the collimation screws Finger tighten the stem nut Now you are ready for the initial collimation Collimation All Protostar secondary mounts use the same principal for collimation The stem of the secondary holder needs to be slightly stretched in order to hold proper collimation Tension in the stem is created by tightening the tensioning nut as shown in Figure 8 or by turning the collimation screws clockwise Collimation should always be done in the following order 1 center the secondary mirror under the focuser using a sight tube 2 tilt adjustment of the secondary mirror and 3 tilt adjustment of the primary Copyright 1996 2013 Protostar Tension in the stem TENSIONING causes ee a Poe ra d a r i r Yr lit a 7 i f oo J IF l s
6. miniature jack screws in the base just for this purpose or by adjusting the position of the arch tangs in brackets Tilt adjustment of the secondary mirror Start the tilt adjustment with the tensioning nut only finger tight If most of your subsequent turns of the collimation screws are clockwise this us usually enough to tighten and lock the system in place with no further action i e you do not need to tighten the main nut as a final lock down If you find the secondary holder is still too loose you can manually tighten the tensioning nut another half turn Do not tighten the tensioning nut more than is needed to just keep the holder from rotating freely The secondary mount is designed to hold collimation with very little friction and tension in the system Technical Support We want your Protostar product to perform well in the field If you have a special application not covered in these instructions or any other questions feel free to call us for technical support at 614 855 5341 between 9 00 AM and 5 00 PM Eastern Time Zone Copyright 1996 2013 Protostar
7. ry mirror from the telescope The mirror holder should also be removed from the arch assembly during installation Choose the orientation you want The Protostar curved support can be oriented in two ways as shown in Figure 1 In most cases the top mounted orientation is preferable When the arch is top mounted no part of the arch is visible from the vantage point of the focal plane Reflected light from the support structure is eliminated In some cases other accessories finder scopes etc may interfere with this location so the bottom mounted orientation must be used a s r TOP MOUNTED ORIENTATION BOTTOM MOUNTED ORIENTATION Figure 1 Arch orientation options Installation Instructions Required Tools You will need the following tools flat screwdriver Phillips screwdriver ruler pencil scissors tape Step 1 Mark the bracket centerlines Temporarily attach the two mounting brackets to the arch support using the supplied 6 screws and nuts The fasteners only need to be finger tight With the bracket feet facing outward see Figure 2 compress the arch enough to make the bracket feet sit flat on the tube wall While holding the arch in this position make pencil marks on the end of the tube that correspond to the small notches on the ends of the brackets It is not important to position the arch with high precision as you will accurately position the secondary mirror in a later step MAK
8. s have three positions for the tangs at the feet of the arch to snap in to This allows for precise positioning of the secondary mirror within the tube Find the best position for the arch that best positions the secondary mirror within the tube Reinstall the 6 fasteners and fully tighten see Figure 5 Step 7 Edge on arch adjustments The 8 screws holding the brackets to the tube should still be only finger tight By sighting down the tube from a 6 FLANGE 8 FLANGE NUT 48 39 SCREW BLACK BRACKET 8 32 SCREW Figure 5 Bracket mounting detail Copyright 1996 2013 Protostar few feet away check to see if the arch silhouette appears edge on Make adjustments by twisting each side of the arch until it appears the thinnest One of the bracket holes is elongated to permit the bracket to rotate When you are satisfied with the appearance tighten the bracket mounting screws Step 8 Install the Secondary Mirror Important Note If your secondary mirror is the same size as the holder it can be installed using the metal shroud In some cases mounting the mirror with an adhesive will be necessary 1 Our 0 75 and 1 00 holders are not supplied with a shroud so the glue method is used 2 Many imported secondary mirrors are not the size of our holders so gluing is required 3 Most secondary mirrors are from glass castings and frequently slightly oversized This results

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