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13

Primary Mirror Center Mark 

You may have noticed that your StarBlast 4.5 has a small adhe-
sive ring in the exact center of the primary mirror. This “center 
mark” allows you to achieve a very precise collimation of the 
primary mirror; you don’t have to guess where the center of the 
mirror is, which is important in the collimation process. This cen-
ter mark is especially useful when using an optional collimating 
device. 

Note: The adhesive ring should not be removed from the 
primary mirror. Because it lies directly in the shadow of 
the secondary mirror, its presence in no way adversely 
affects the optical performance of the telescope or the 
image quality. That might seem counter-intuitive, but it’s 
true! Leave it in place. 

Aligning the Secondary Mirror 

Align the secondary mirror first. Note secondary mirror collima-
tion screws are Allen screws, so you will need to use the includ-
ed 2mm Allen wrench to adjust them. 

Look down the focuser at the secondary (diagonal) mirror. If 
the entire primary mirror reflection is not visible in the second-
ary mirror, as in 

Figure 13B

, you will need to adjust the tilt of 

the secondary mirror. This is done by alternately loosening one 
of the three secondary mirror alignment screws then lightly 
tightening the other two (

Figure 14

). The goal is to center the 

primary mirror reflection in the secondary mirror, as in 

Figure 

13C

. Don’t worry that the reflection of the secondary mirror (the 

smallest circle) is off-center. You will fix that in the next step. 
It will take some trial and error to determine which screws to 
loosen and tighten to move the reflection of the primary mirror 
to the center of the secondary mirror. But be patient and you’ll 
get it. 

Aligning the Primary Mirror 

The final adjustment is made to the primary mirror. It will need 
adjustment if, as in 

Figure 13C

, the reflection of the primary 

mirror is centered in the secondary mirror, but the small reflec-
tion of the secondary mirror is off-center. The tilt of the primary 
mirror is adjusted using three spring-loaded collimation knobs 
and three smaller locking thumbscrews on the back end of the 
optical tube (

Figure 15

). First loosen the three locking thumb-

screws a turn or so. Then tighten one of the collimation knobs 
about a quarter turn and see if the secondary mirror reflection 
has moved closer to the center of the primary. If it moved far-
ther away then try loosening the same collimation knob a bit. 
Repeat this process on the other two sets of collimation screws, 
if necessary, adjusting them one way or the other and seeing 
if the secondary mirror reflection moves closer to the center of 
the primary mirror reflection. It will take a little trial and error to 
get a feel for how to tilt the mirror in this way. When the center 
hole in your collimating tool is centered as much as possible on 
the reflection of the adhesive dot on the primary mirror, your 
primary mirror is collimated. The view through the collimation 
cap should resemble 

Figure 13D

. Finally, very lightly tighten the 

three locking thumbscrews so that the primary mirror stays in 
that position. A simple star test will tell you whether the optics 
are accurately collimated. 

Figure 15.

 The optical tube’s rear cell has three pairs of 

collimation screws. The large knobs are the spring-loaded 

collimation knobs while the smaller Phillips screws are the 

locking screws.

Collimation knob

Lock screw
(Phillips)

Figure 14. 

Use the included 2mm Allen wrench to adjust 

the three secondary mirror collimation setscrews.

Collimation 

setscrews 

(Allen)

Содержание 10015

Страница 1: ...rre de recherche v Cliquez ensuite sur le lien du manuel d utilisation du produit sur la page de descrip tion du produit u Wenn Sie das vollst ndige Handbuch einsehen m chten wechseln Sie zu OrionTe l...

Страница 2: ...2 Figure 1 Components of the StarBlast 4 5 Astro Reflector telescope Dust cap EZ Finder II Allen wrench 25mm eyepiece 10mm eyepiece Moon filter Optical tube and Base...

Страница 3: ...n the focus knobs to achieve the sharpest possible image 4 EZ Finder II Reflex Sight A non magnifying finder scope that helps you aim the telescope and locate objects in the sky for viewing It emits a...

Страница 4: ...4 Figure 2 Anatomy of a great telescope the StarBlast 4 5 1 2 3 4 5 7 12 13 8 9 11 10 6...

Страница 5: ...erimposes a red dot generated by an internal LED light on the sky showing right where your tele scope is pointed Figure 7 Before you can use the red dot finder scope you must remove the small tab stic...

Страница 6: ...ered in the telescope eyepiece and in the EZ Finder II the EZ Finder II is properly aligned with the telescope The EZ Finder II s alignment should be checked before each observing session At the end o...

Страница 7: ...a haystack Once you ve centered the object in the eyepiece you can switch to a higher magnification shorter focal length eyepiece if you wish This is recommended for small and bright objects like pla...

Страница 8: ...try skies You ll be amazed at how many more stars and deep sky objects are visible in a dark sky Cooling the Telescope All optical instruments need time to reach thermal equilib rium The bigger the in...

Страница 9: ...osure cameras and have false color added Our eyes are not sensi tive enough to see color in deep sky objects But remember that you are seeing these objects using your own telescope with your own eyes...

Страница 10: ...Deep Sky Objects Under dark skies you can observe a wealth of fascinating deep sky objects including gaseous nebulas open and globu lar star clusters and a variety of different types of galaxies Most...

Страница 11: ...aterial with laminate finish Mounting saddle Vixen style dovetail with clamp knob Optical tube mounting adapter Vixen style dovetail bar two 20 threaded holes on bottom Eyepieces 20mm 4 element Bertel...

Страница 12: ...red in the focuser as well as the reflection of the primary mirror centered in the secondary mirror and the reflection of the secondary mirror and your eye centered in the reflection of the primary mi...

Страница 13: ...ut be patient and you ll get it Aligning the Primary Mirror The final adjustment is made to the primary mirror It will need adjustment if as in Figure 13C the reflection of the primary mirror is cente...

Страница 14: ...esigned for eyeglasses Before cleaning with fluid and tissue blow any loose particles off the lens with a blower bulb Then apply some cleaning fluid to a tissue never directly on the optics Wipe the l...

Страница 15: ...15...

Страница 16: ...ned postage paid Proof of purchase such as a copy of the origi nal receipt is required This warranty is only valid in the country of purchase This warranty does not apply if in Orion s judgment the in...

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