Meade Telescope TMB 130 User Manual

aberrations, and 1/60th wave for sharp (fifth order) aber-  
rations. It is highly unlikely that even the most ardent ob-  
server can see errors of this small a magnitude, even under  
very good seeing conditions (which is when the atmosphere  
typically presents a 1/4th wave P-V wavefront to the tele-  
scope and eye).  
Something else to consider in star-testing refractors:  
the change in spherical aberration with a change in wave-  
length. This is called “spherochromatism” and is found in  
the wavefront of all refractors. What this means is that as  
the lens is tested in the longer (red) wavelengths, the lens  
becomes “under-corrected,” and in the shorter wavelengths  
(blue), the lens becomes “over-corrected.” These overlap-  
ping corrections at different wavelengths change the star  
test pattern from perfection.  
So, while star tests are interesting and useful, most ob-  
servers spend their nights enjoying the heavens, not just  
examining points of light. We feel that the proof of optical  
excellence is in the observing, not just in the testing.  
All TMB objectives are corrected at the peak visual  
wavelength, which is centered at around 560nm in the  
green-yellow portion of the visual spectrum. The eye sees  
over 80% of the visual detail at this wavelength, and it is  
the proper correction at this visual peak that makes the  
difference between just a good objective, and a superb one.  
We design and figure our lenses for the best possible  
wavefront at the green-yellow wavelengths, to give you  
the sharpest images and highest contrast possible.  
A FINAL WORD  
We thank you for your purchase of this TMB-130. We  
believe that this apochromatic refractor will outperform  
any other telescope type, inch for inch, and is the most  
trouble-free telescope that you can buy. Its versatility in  
visual, photographic, and CCD work is unmatched. With a  
little care, this fine apochromatic refractor will last you a  
lifetime. Please enjoy the wonders of the night sky!  
The collimation screws  
(one pair of three)  
TMB Optical TMB-130  
The collimation screw  
(taller)  
Thoma a  
s M. B ck  
Signature Series  
The lens cell  
Thank you and congratulations on your purchase of  
this TMB Optical TMB-130 130mm f/7 ED apochromatic  
triplet refractor. Its optical and mechanical quality will give  
you many years of observing enjoyment.  
medium format film cameras and very large chip CCD  
cameras. The drawtube ends in a 2” accessory adapter with  
a non-marring soft brass compression ring eyepiece holder  
that will not damage the barrels of your 2” eyepieces and  
accessories. This adapter allows visual use with 2” star  
diagonals and eyepieces, plus imaging with 35mm film  
cameras and 2” barrel large format CCD cameras.  
The 2” accessory adapter is secured to the focuser draw-  
tube by three recessed hex-head screws. Undoing these  
allows you to remove the supplied 2” adapter and replace  
it with a custom-made Feather Touch adapter for medium  
format (Pentax 6 x 7) film photography using A-P photo-  
graphic accessories. Please contact Starlight Instruments  
directly at (847) 985-9595 for any specialized adapters  
you may need in this regard.  
The lock screw  
(shorter)  
Lens  
TELESCOPE MOUNTS  
Your new TMB-130 is usable with many different types  
of telescope mounts. Asuitably sturdy altazimuth mount is  
a good choice for most purely visual observing. An altazi-  
muth mount is typically light in weight, easy to set up, and  
is relatively low-priced. Just be sure that the mount is ca-  
pable of handling the scope’s weight (which will be well  
over 20 pounds after adding mounting rings, diagonal, eye-  
piece, etc.)  
A high quality German equatorial mount would be an  
excellent choice for both visual and imaging purposes. The  
very stable German-type equatorial mount can be driven  
in both right ascension and declination for photography  
and CCD imaging, as well as for uninterrupted visual ob-  
serving. The quality of your images will not only depend  
on the optical quality of your telescope, but your local con-  
ditions (the seeing and how dark your site is), the tracking  
accuracy of your mount, your imaging equipment, and your  
guiding and image processing techniques.  
the shorter of the pair is the lock screw that holds the proper  
collimation after adjustment. Be sure to adjust only one  
set of collimation screws at a time. Loosen the lock screws  
before attempting to turn the collimating screws. Make only  
small changes at a time (turning the collimating screw only  
a fraction of a turn and checking to see the results before  
turning further).  
When you finish adjusting the collimating screws, be  
sure to snug down all lock screws to hold the correct colli-  
mation. Do not over-tighten the lock screws, but make sure  
they are firmly in place. Once collimation is complete, your  
objective lens will be on the same optical axis as the eye-  
piece, camera, or CCD, and you will obtain the best pos-  
sible optical performance.  
The other method of collimation is to examine a first  
or second magnitude star image at high power at night af-  
ter the scope has reached thermal equilibrium. This colli-  
mation method requires an equatorially-mounted scope and  
a motor drive to keep the star image centered while you  
adjust the collimation screws. It is generally a more diffi-  
cult and time-consuming collimation method than using a  
Cheshire eyepiece, as you are working with a small and  
droppableAllen wrench in the dark and are at the mercy of  
changing seeing conditions.  
Be sure not to choose a closely-spaced binary star as  
your test star. Do not use a star diagonal when collimating,  
as you may be attempting to correct a problem in the di-  
agonal, rather than in the telescope. Adjust the push-pull  
collimation screws until the star images are tight and round,  
and the first and second diffraction rings are uniform in  
their intensity all the way around the Airy disk.  
Focuser  
rotation angle  
locking ring  
Focuser  
rotation  
handle  
(1 of 3)  
Coarse  
focus  
knob  
TUBE RINGS  
No tube mounting rings are supplied with your TMB  
refractor. However, well-machined 142mm TMB hinged  
split rings are available from your telescope dealer.  
FOCUSER  
Your TMB-130 has a dual speed Starlight Instruments  
Feather Touch Model FTF3545 rack-and-pinion focuser.  
This ultra-premium focuser has a long travel 3.5” diam-  
eter drawtube for non-vignetted astrophotography with  
Fine  
focus  
knob  
Tom a  
B ck  
Finder bracket  
mounting holes  
Combined drawtube  
tension/lock knob  
under focuser  
Focuser rotation  
handle (1 of 3)  
SOME BRIEF SPECIFICATIONS  
Screws  
connecting  
2” adapter  
to drawtube  
(2 of 3)  
Aperture ................................................... 130mm (5.1”)  
Focal Length ....................................................... 910mm  
Focal Ratio .................................................................. f/7  
Objective Type ........ air-spaced ED triplet apochromatic  
Optical coatings ................................... fully multicoated  
Resolving Power (Dawes’ Limit) ......... 0.89 arc seconds  
Visual Limiting Magnitude .................................... 13.1  
Light Grasp Versus the Eye................................... 345x  
Focuser .......... FeatherTouch #FTF3545 rack and pinion  
with dual-speed and 11:1 reduction ratio fine focus;  
2” and 1.25” compression ring eyepiece holders;  
Focusing scale  
on drawtube  
(1 on each side)  
THE STAR TEST  
We strive to make the best apochromatic optical sys-  
tems available. You may find your lens may not test “per-  
fect” during an extended and stringently-graded “star test,”  
particularly if the scope has not fully reached thermal equi-  
librium before the test. This is not an indication of a poor  
optic. It is rather due to the test star’s complex wavefront  
of light that is being constantly changed by our living at-  
mosphere as seeing conditions vary from minute to minute,  
from second to second.  
No optic is perfect and likewise, under a detailed and  
extended star test, every telescope optic will show some  
error. The sensitivity of the star test under perfect condi-  
tions is 1/20th wave P-V on the wavefront for third order  
Brass  
compression  
ring  
2” accessory  
adapter  
2” accessory  
lock knob  
(1 of 2)  
Features of the Focuser’s Right Side  
2”  
The supplied 2” to 1.25” accessory adapter is designed  
for visual use with 1.25” star diagonals and accessories,  
plus imaging with standard format CCD, webcam, and  
35mm adapters. This adapter also uses a non-marring soft  
brass compression ring to hold your 1.25” star diagonals  
and accessories in place. The barrel of this adapter is  
threaded to accept standard 2” filters and has a slight in-  
ward taper at the top. The taper engages the compression  
ring of the 2” adapter to prevent the 1.25” adapter from  
slipping out of the focuser, should the 2” adapter’s thumb-  
screw accidentally loosen during use.  
Brass  
accessory  
compression  
adapter  
rings  
360° rotating camera angle adjuster  
Focuser Travel ........................................4.33” (110mm)  
Tube Diameter ................................. 142mm (5.6”) o. d.  
Tube Length (lens shade retracted)...... 28.75” (730mm)  
Tube Length (lens shade extended) ....... 34.5” (876mm)  
Optical Tube Weight............................18.7 lbs. (8.5 kg)  
2” accessory  
lock knob  
(1 of 2)  
TMB Optical, P.O. Box 44331, Cleveland, OH 44144 (216) 524-1107  
Coarse focus knob  
1.25” accessory adapter  
Features of the Focuser’s Left Side  
© 2007 by TMB Optical  
 

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