Transcript
Triplet Ortho Apochromat
TOA·150B
INSTRUCTION MANUAL
TAKAHASHI
Thank you lor purchasing the TAKAHASHI TOA- 1SOB Triplet Ortho Apochromat. The oplicel design is new Dnd is able to produce color·free, high conllast images due 10 Its extremely high color correction. The TOA-1SOB is corrected in the non-visible neer infrared end UV to make CCO imaging eesle,. The optiOnally available reducers, which include soon to be released 645Reducer for IlIrge chip CCO Cllmeras lIIld Ilatleners. tum the outstanding visual TOA 1SOB into a flat field IIStrO ClImera. In order to use the TOA-150B to the limit of It cllpabilltles, pleue reed Ihis instruction manual and familiarize yourself Wilh the function Of the entire system before using the TOA.
I
I
LhWARNING
NEVER ATTEMPT TO DIRECTLY OBSERVE THE SUN THROUGH THE TOA.150. NEVER USE ANY SOLR OB. SERVING DEVICE THAT DOES NOT HAVE A FUU AP ERTURE FILTER DESIGNED FOR SOLAR OBSERYING. ANY DEYICE THAT DOES NOT COYER THE OBJECTlYE WIU ALLOW THE INTERIOR OF THE INSTRUMENT TO HEAT AND COULD CAUSE THE OBJECTIVE TO CRACK. FURTHER, THE FINDER SHOULD BE COVERED WITH AN
LflDANi @" /Sf;)
OPA~UE COYER
TO PROTECT THE EYE FROM DAMAGE. USE A PIECE OF SOLAR GRADE MYLAR TO COYER THE OBJECTIVE. AN UNCOYERED FINDER CAN CAUSE SERIOUS EYE DAMAGE OR BUNDNESS. KEEP THE INSTRUMENT OUT OF THE REACH OF CHILDREN DURING DAYTIME USE.
I
Lt. CAUTION
• When the TOA·1506 is placed on a sulface, make certain that the face is flat to prevent the OTA from rolling off.
I
sur·
• Keep the lUbe assembly out of the Sun eKcept when it is being properly used for solar observing. If left in the Sun the air inside could heat up and cause damage to the objective. • Keep small children away from small objects like oculars to prevent them from accidentally swallowing a part. • Keep Ihe shipping carton in a safe place away from any flame. It can be used as a temporary travel container since it is triple boxed.
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CONTENTS Warning & Caution •..•.••.•..•.•..•.•..•.. 2
CONTENTS 3
Specifications 4
Tube Assembly layout 5
What is the TOA-150B 6
Attaching Finder & Tube Assembly 7
Focusing 11
Finder Alignment 13
Observation 15-16
PhotoNisual Accessories 17·23
Care & Maintenance 24
Additional Precaution 25
System Chart 26
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SPECIFICATIONS I II~~~~~~ Optical System
Air Spliced Triplet
Effectlve Apel1ure
l50mm
Focal Length
1100mm
Focal Retia ······································1: 7.3 Resoving Power 0.77" Limillllg Magnitude 12.7 Ught Gathering Power 459X Diameter of Main Tube I/J 179mm Length of Main Tube Weight 01 Main tube
990mm 20.0kg [42.7IbB]
includes 4.8kg lube coonler weight Finder Scope
7xSOmm
;
• 111'>'
_
1110
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ISH
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••
16 1
===T=U=b=e=A=S=Se=m=b=IY~La~Y=O=ut===11 Oe'" Sl>ield _ _"
Dew $held lock Sen....
,... ---I
FQR--l F""",", Hou..... Focu .... Clamp
~-
'"
Ret'c1e Illuminator (Optional)
Ada¢.er [Tw] Ocul" Adapt.... (SO.8rnrn)
fit_
11,=====W=ha='=iS='=he=To=A=-=15=O=B===....11
The TOA-1SOB is 8 product of Takahashi's
wave length to the cline 81 656Oa. This IS
research and development over II period of time. Though similar in design to the
an extremely high Older of color coHectioo.
smaller TOA·130N. its desig" is different to
lateral
"Ilow an extremely high order of 1;0101 cor·
very high contrnt image that allows mag
rection in a 150mm refrector. This design
nifications of OYer 100x per inch or more.
produces en image ebsolutely free 01 any l8leral color and is diffraction limited.
The TOA·l50B can produce an image of I
A design with this conection will show no coIOf
in
Of
out of locus. The rawlt is
micron In the cenlar in
to Rernc:t If'Id Extend
the t...er. Shade
The lens ahMIe can be relrec:te
Fie. 8
-.
• Attaching Oculars & Accessories
.....".... [TW]
50 I......
5GJ E _ Tubo(L)
501 s. r.;,,,,,S) J1.70c0Ar.........
na-.
fie to
M12;(IO
• Compression Ring
Remove the ocular cover after loosening
the chrome lock ring by turning it counter
clockwise. Then, intiet the ocular inlO lhe
adapter and Iootely lighten the chrome Ioclo:
fing by IlJrning i\ clockwise.
• Connecting System Parts Study the syslem chart carefully included in this iOS1TUCliOfl manual before connect ing system paf1s. 'ncorreclly connecting sv-tem pans will 001 allow the TOA 10 fo cus or image will not be 81 sharp as II can bo.
fIe. 11
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ocusing The best possible focus will' insure he igh
Begin the focusing p ocess by choosing a
est degree of satisfaction from the TOA. Do
brigh
no forget ha
e atmosphere will limit the
ar in a convenient position. When t you have achieved the best
you think
highest usable magnification.
focus, move the focuser inside an outside
S rt with
of what you think is the best focus. This
low powe ocular and then, by
using shorter and shor er focal length
will confirm the critical proceu e.
oculars, increase the magnification un 'I the
Begin with a low power ocular and then pro
desired magn! Ication is achjeved.
ceed highe and highs until the desired
This process a so allows he
a
jec to
e
magnification has been achieved.
continually cente ed in the field 0 view.
When he bestfocus a high magnification
Please familiarize yourself wit the follow
has been achieved, you may notice a bright
ing procedures.
and dim ri 9 round the s ar.
his is at
defect but rat era diffraction pattern wh'ch is an indicatiain a di
Focusing Sys em The TOA-150B uses a rack-and-pinio fo
I
ae ion timi ed op
tics.
cuser. This foe use enables the observe to Focus apidly, Turning the focuser cloc
Dr:
Tube
wise will move the draw ube ou , while urning i counter-clockwise will move· e drawtube in. Refer to Ig. 12. This focuser h sakahas i original
1n mi
cro edge ocuser built-in. 1i rning the small knob clockwise or counter-clockwise can ae ieve very me focusi 9 a high magnffi· ca ion or 'or imaging. Re ave the liens shade cover and
e al
minum plug fr,om the 31.7mm compression ring adapi er. Insert the diagonal prism in
0
Focusing Knob
the compression ring adapter. Carefully tighten
e compression ring until it egins
o made contac with the barrel of the di· agonal prism. It is not necessary 0 over· tigh, en the ring to hold the iagonal prims. Then insert he ocular in
0
the compres
sion ring of the diagonal prism, repea ing previous process. Be careful no to over ighten the compression ring.
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~
The draw tube is coming au when he knob is urned cOUn
er-cloc
Focuser Clamp
ise.
Fig,12
• Focuser Draw Tube Clamp The fOCtlser clamp is loeall!'d on the under side of the Iocuser. 11 is the haoole as shown in Flg.13. Pulling it tow.rd, the locus knob tightens the damp and pushing it fOfWard loosens il. 11 is not necessary to pull Ihe clamp with force since II light pull is suffi. cient to hold .ny load. Do nOI over tighten this clamp.
0
0
o
0
= •
ccf
Ono. lube
• Camera Angle Adjuster The Camera Angle AdjuSl.er was invented by Tllkahashi In tIM! 1970's and jl still being used today. It II a bearing r«atar device thaI allows the ocular to be turned 360" to the most comfort!lble position without loss of focus or de-cltntering. Thffe is 11150 a locking knob to hold the ocul"" and di.go nalln position.
Olif
....::/ Fi •. 13
6
Caution
Nevel loosen Ihe fOUl screws 1M3 hexagon hole bolts) under any circmustances because these SClewS hold Ihe f181 bearing. If these scntws are loosened lhe focuser will become Ioow.
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• Finder Alignment ,M,--
V Before pl8clng the finder Into the finder holder, wrap lhree layers of clear cellophane tape Iround the tube of the finder where the front set screws make COrl1llCt with the finder. The ,ear sel screws have a protec live nylon cover over the end of the screws 10 prevent Ihem Irom screlching the lube. The 7X50 finder [sttmderdwith sets and op· tionel olherwise] has 8 6.3· and uses an intelfupted crosshair that allows Ihe pre· cise centering of a star In the field of view after the finder hes been aligned with Ihe main optics. An optional illuminator wilt help the ob server to see the crosshairsln a dart site and make finding objects end centering them In the field of view easier.
Ihumb screws Iocaled allhe raar ollhe finder mounting brackel. You mav also adjust the three set $Crews located at the front of the holder, but ellercise caution while doing this. vou will need a very small slotted screw driver. It is rere that this is necessary. 3. Nelli insert e high magnification ocular and repeet the process until you have used a very high magnification ocular to center Ihe star in the field of view and the center of the finder. Since the TOA. 1508 is supplied wilh a quick release brackel. il would not have to be done for a long period time.
The finder must be aligned with the main optics ollhe TOA-150B in order 10 allow the finder to be as useful as possible. • A1icnment Procedta-"e 1. Remember lhat the motor drive shCHJld be engaged when the finder is aligned with the main optics. It is recommended that Ihis procedure be done at night on II bright 8ter, though it cen ba done in daylight using a larget a few miles away. 2. Place a low power ocular in the lOA and find a bright stat which you will center in the field of view. Then looking through the finder, center the staf at the center of the inleHupled crosshair. By using the
FI&.13 • Acliustina: Serew Procedure 1. Turn all the lock nuts untillhey reach the head 01 Ihe alignment screws. 2. In order 10 move the crossha.r in Ihe di. rBClion of the arrow, first loosen screw (a) and tighten lpush) the linde' with
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screw (c). This procedur,e wi!1I move the
the iIIumina.tion to be changed to Sll it the
Cfossnair i th desi e direction. The top
sky condit1ions. Turn·ng the knob counter
of the' findle will move inl the opposite
clockwise will tum the illuminator off. The
me object wUI move in the
knob will click once again whe i is· urned
direction , d
direction of the smaller ar'fOW. Refer to
off.
Fig.12.
3. In a simils' fashion the direction aT the movement of he finder is made by ad justing the three screws. learn· he rela ionship between the move me t of the hree adjusfng, screws. If he mder can not be moved in e desired di rection, oosen the locking nuts.
OF
Replacing Batteries View
leld of Rnder-
Before changing the batteries, make ce ain that the r lumin to has been ,urn doff. Unscrew the battery holder as shown 'n Fig.
14. Remove he old b
eri'ss d replace hem wirth fresh Ones hat hav been wiped
off
0
make certain hat t eyare
at con
tamina ed by d"rt or grease, Chec the po larity and lnse Ihe batter'es into the ho de and screw it tiOgether. Then urn he knob View Freid of Telescope
Fig. 13
clockwise.o ma e carta"
ha the illumi
ne or is working. he batteries you will nee are silver V-76 PX or equivalen battery.
Optional Reticle lI1uminator The Takahashi 7X50 a d llX70 finders wHi
Hol'd e nurled cap and tum the ba.ttery case as arrowed
aceep t e opfonal Reticle III minator. This i'llumina or by II minating the interrup ed crosshair in the finders makes' he cente ing of objects in he field of view easier. The Reticle illuminator is inserted into he hole covered by the slotted SCrew,
0 the
~ercury
Battery (V76-PK) /
eyepiece end of the finde . Fig.13.
Batte ry Oll se
It you wish to turn the ilium 'nater 'on, tur the chrome knob clockwise. T e knob will click when it is turned on. This will aHow
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Observation
II
II
• Visual Observation
• Astrophotography
• Determining Magnification The magnification of ao.,. ocular used with the TOA can be calculated by U$ing the to!·
focus i. the mo" crilical parI of a fine astrophoto, Once critical focus is Khieved, photos can be made. If possible, recheck focus to make certain that nothing has changed.
lowing formula.
(local length of a lltlescopel (fOCll"ength of an acul,lI} Thel8fofe, the shorter the focal length of
the ocular. used, the higher the magnifica tion produced. During the nIght of exceptional seeing, the
TOA-150B CIn be used It 8 magnification of 130X per inch .nd on nights of excep tional seeing 160X 01 more can be used. These rare nights of exceptlOnall8eing wi.1
• Prime Focus Photography This is the melhod 10 take photo by plac ing film al the focal poinl of the lelescope. This means the telescope i, use. as a tele· photo lens. The focal length ola telescope I, lar longer lhan lhal 01 a camera lens. Even a 5lighl miSlake 10 guide the telescope will make "ar images delormed. II i' ad· viuble to use a heavy dUly equato,ial mounl for astropholography.
reveal fine planetary fitaments lind small
craterlel, on lhe Moon. At the lower end, uliog II mignificillion of lOX pet inch will produce breathtaking, Ultr8 high contrllsl views 01 galallies, nebulae lind comets.
• Compression Ring Star Diagonals Takahashi supplies each TOA·l5OB set [tele·
scope w/mount] with a 90 compreuion ring 31.7mm diagonal. The compression ring cenler.lhe OCt.Ilar and makes the opli cal ilJ(es of the ocular and the telescope co incidental, Set the ocular into the compression ring and carefully lighten the ring. 00 not overugten the compression ring.
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• Eyepiece Projection Photography The TCA-4 has been designed to allow the TOA-150B to be used 101 high magnifica tion imaging/photography of the Moon aoo the planets. It is designed to attach easily and allow the
Focusing with the FM-60 focusing micro scope and ground gin. is shown in Fig.16. Set the ground glass in place with the mal side lacing the objective 01 the TOA. Then focus and check for pinpoint focus over the field of view.
projection magnification with any ocular used to be changed by using the elrtend· able ocular tube . • Seeing h is important that high magnification im ages of the Moon and planets require good seeing. The method for determining the quality of seeing on a scale of lto 10, with 10 being perfectly steady seeing Is to look to the lllflith at a brighl mr. If it Is twinkliog rapidly, the seeing i. between 1 to 4. If the twlnklil"lg is moderate Ihls is 5-6. If the star twlnklM slowly to no twinkling. we have the 7 10 10 night. The less twinkle the bellel.
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Cautions
When laking high magnification pho tographs of the Moon and planets, pay careful allentiOl1 to balance. Rebalance the telescope when lhe object is placed in the center of the camera. If the telescope is moved to another
object. then rebalance it in the position in which the photos will be taken. Do not use the camera shuner; use the "hat trick", black card place over the len. 5h8de before the shUller is sel on bulb. After the vibration has stopped, re move the black card fOl the duration of the photo, which will normally be in seconds. - 16
FOCUSlr1l Screen
,...... Fil.16
Accessories for Photo/Visual Application A wide variety of Imaging and visual ilCCl!ISsories
lila
available 101 the TOA.l50 including reducefl, flanen ers and II flat field 1.6)( visual elrtender.
• 57-A.ttlloa. The 67 Flattener when used with the TOA
1508 and 130NFB to produce II ttl90mm image cirde with 3 micron stars 81lhe cen ter of the image, with 20 micron stars lit
.67.FI1I1IIlnll. · Focallenglh • Foo;al ratio • Image ci,cle
the edge of the Image circle.
"""mm • """m
tn.J
a1-~_
Fi&-11
•
3~FllIttener
This flattener is designed lor imaging with a CeD camera, digital SLR, 35mm film cam era lind visually. The 35·FllIlloner lInaches easily to Iha TOA-l50B by means of itl
.35-Flanen., · Focal I8ngth · FOClII r8lio • lmag. eirel.
10llOmm
m.2 ~
40mm
50.8mm blIrrel allows imaging and visual equipment to be easily interchanged. The
l/)40mm llat field produces 2-micron stars in Ihe cent6f and 8-micron at the edge, dif fraction limited images.
=
~SlRc.......
Fi&- 18
Ado¢...
[lW]
• J5-Reducer
h
This newly developed reducer employs 2 multi· coated elements to produce a flat field with a focal of 1/5.7. The 35-Recucer is
= Fic. t9
designed to, with the use of additional Vari rings; reduces the focal ratio to 1/5.1 with a reduced image circle. The stars
si~e
• 35-Aedllcer with One Vorl.ring · Focallen{llh 860mm · Foeal ratio 115.7 · Imaga drclo ~ SOmm
re
mains below 20 microns which makes it useful for CCO cameras and digital SLR imaging.
• 645-Reducer The 645-Reducer is specially designed ul
10 microns at 40mm circle and 20 microns
Ita high quality reducer to produce maxi
at 60mm circle can be produced with illu
mum performance of super apochromatic
mination of 100% at SOmm circle with f/5.6
optical system when large sized CCO or full
\TOA·1508j - f/5.B\TOA·130NFB).
"ized 35mm digital SLR camera i" u"ed with the TOA-150B or TOA-130BF modeL In order to achieve maximum color correc tion near the edge of the field, 8S a rear converter, a large sized 4-element 4-group system is used. Due to this, image sizes of
e45~(TO"'-150S.tl
Adopter(TWJ
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.645 Reducer · Foeallenglh · Foeal ratio · Image drcle
840mm lfS.6 o 65mm(60%) ~ SOmm(lOO%1
• Extender-TOA I.SX The Extender-TOA 1,SX is newly designed a two element extender, with an ED glass being used lor one 01 the element, that in. creues the local length 01 the TOA-l5GB to 16S0mm. As Its sleeve size is 5O.8mm, ana ching and detaching is done easily. The longer locallenglh will produce stunning images of the Moon and plane'lS. A 35mm camera can be attached to the Extender· TOA 1.SX with a 50.8 extem.ioo tube and wide T-mount camera adepter. When it is used with the 35-Flanener,11 procuces8 flat 44mm die. circle for vi$U8I, digital SRLcam· era CCO applicalions.
• EXlender E01,S. · Focallengltl 1650mm · Foc.I .elio 1/1 1.0 · 1m. ci.~I.
r; 44mm
~{S)
~EDLSX
Fil_ 21
dlllul.-!,I",
~-
Fil.22
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• CA-35 The CA-35 has been designed 10 be used with the TOA flatteners 35 and 67. lhe Ae· ducer TOA and the Eldender lOA 1.6X. One version can be used with the lOA·35 flat· tener and Extender TOA and the second for the lOA-67 flanener.
L-J,=_ Fia. 23
CA-J5 W","T-
Fir, 24
-
• TCA-4 It ClIn be used with a digital orfilm SLR Cllm
era or properlv adapter CCO camera.
"'
•• 0
[J- t-ajH-; !lOJ ~ TWo(L)
)1-'--
31.7 0cICtI,
!TK.A:llsaosj
las, 645 A~lIC''' [TKA3258OL1 32. T-moun. n, Wide T·moun, :1.4, Q;gitatRm Slfl ea...... 35. CA.J'5l50.81 [Tl(A3\201] 36. TCA-4l31.1j [TlW)0210] 46. OCulI< adllptet(l1/.- I (TKP(lCl01 I
47 OCu"'l3\.71 48. OC....rl50.81 40. ~p
