Takahashi Mewlon - 250 User manual

-250
Instruction Manual
TAKAHASHI

1 Introduction
General Specifications 3
Layout of tube assembly 4
n Before starting obsenation
Mounting your Mewlon-250 ---------
6
Focusing 7
How
10 use the 50.8mm adapter 8
LeI's view landscapes ------------
9
See-through cell 10
m Adjustment
To align the finder scope
---~---12-13
Collimating the optical axis
14-15
N Observation
Visual observation
----17-18
ASlrophotography
----------1'-20
V For good usage
How to calculate the effective
focal length
of your Mewlon 250
----22
Accessories
-----23
Care and Maintenance for your telescope 24
Trouble shooting
--25
System chart
---
26
Page t

I
r
Page 2

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II
Before starting
observation
Pag8 5

\. 1ft o,d., '0 .tt Lh. ",.ift 'ob. 00 tb.
cq~.,orial mou.t, .u ,b. d .. n .....l
ad.p'« filmly o. til. ", .. u, .. i'b two
M8 X20 boll. pro~idcd .. ilb 'ho .d'plcr.
2. Lo<>Il<. lb. cl ... p .. f lb. Dcdl .. OIio •
... d ,.,. ,be do ....... U .d.p'" ••
•bo .... i. ,he fi,.1.
3. n. ",.i. tub. II 10 d •• i,,,.d 'h' i'
<:.00 b. urricd .1 U.C. boldinl ito
n .. d.,. H..ld ,be 'ub I'b .... bud
a..d Irip th flftdU i'b ,b. <Mb'r
h •• d ... b.....o ift ,b. fl •. 1.
Sc' 'h 'ub. i. pl ... , """., lb.
d il Idlp .. r IOd ,be d..........ll
pl', ",cb.d o. 'b. 'ub.. Thea. lock
tbe tob. Iirmly by 1Jo. Jo<:ki", budl •.
•. Cb.ck lb. bllan.in. of lb. lubc II
in b.. ,ia ..... al p ... ;ti .... ","ki., ,h.
O.diu,io. ellmp (ret IOd mlb. Ih.
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... i.bl •• lidi., i. 00 ,b. r.il.
1111 2
1.. o .. ,m.l ... isull ob .. ,v"l ... ,b. m.i. lub ... ill b .... ll balooced by 'ho
ma'Ge' ....i.11I ooly. wb •• lbe c."'., •• ad ilS ad.pter a,. u••d fo' •• lrO-
pbO'OIUpbr, loo'b .. lbl m.,n., ... ".bl .. ,ll b .... d.d lor bal.ndn, lbe 'ob •.
Whoa lb. lII'loU w.i,bt i. a"acb.d .. lbe ,ail, ••• i' i. pl.co co" .. rly
a' .hown I. 'hc fil.2. O'b.,....i ••. i' ... y drop oot.
Kup ""'.y ma, •• t" .• d ca,d •• ocb ... Idepho •• card, • fiopH dISk, aod .0 .. 0
fr"lII ,b. 1111'''.' wei,bt.
Palltl 6

fOC'O .... en be .. ade by 1110.'" • .be Mco.4""
.Ilfo. ellettlcall, 10, .100 mo'o" .. kick ..
.... uold 10, • 10104«14 cootlol pad..
All.. 11.1110'1' I. oc' 'be ,,,t>c 0. ue ......
,.u.t llot eo.ueIO, of 'be co."ol pad. i.'.
'be ,"cept.cl. p.o •• lfe" •• '.e b... of ,lot
I.be I. llot 11.,}, Wku 'h IOCII
I ,lie pl. iJ polld oIow tlo" 'I'
""h". II>. •• "...." .i"o' 1.0.".
'h ..... 1.. .f lbe nbe .. 4 ••• f.cal ,oi.'
... ea 10. o. , •• 0'''''"'' fo"".
Ie .. , \I 1""1114 d_ ... t1le '0' pIIiI t1la
i.eo ••• I, 1111'0' MO .. i I.w.,d I •• p.i ,
111,,0' •• d 1101 focal pO'OI '0<:.0 •••. Whl 1M
lo"u, •• lu., ,. 'lto, .. d , •• lot .n., .. 1
pO.ll100. ,be 11010. ..Ill iUlp.
The ttlo,or Iptld en be " ..... d b, ,." d" ....
01<.4. Iwlteh, Wlool ,10. IW"ck II .... 'h ·H·
pOII'lno. 'h 1101.' 'uu ., .1.10 I,ccd , ....
for 110.10' Ih foeol polo' ., IU"., A' 'bl
'1.' pOII,loI, .h 1110'0' 'US .. low .poe4 10
II' f., 1, .. 1, adJII'I.. ,.be f","1 p.I."
Thl aclJ"".' ... ud ., I ... ape.ol lIode ca. be
cou,.I.d 10, ,be Ipc"" Idj"'" hob » .h,
,.. ca. le' ,lot .p.d II ,.0 lih, ""'1111,
lui.. 'be tlKll p.i.' .
..... bU foen... 1100 effecli.1 focal I...... M',
h. olt"nd 10, p •• ltbll ch.,. 'b. 41f'IIel
br:.'wu. tlo. 1" , .i"'lr uol tloe H" ..... '
.OC I ••• , ... 1 lo._e~u, Ih,e w,ll be
I,ttl. cllilca til..... tlo. _.t wldel,. flOCll
I. <:IIC roo "UC 10 l-.. .. r t1la ..... ifleotlo••
01 .. , tlo. efl.a..e foal 1 •• (t1l of lOOO_.
If , •• 10 .... h .... 1 i. ca.col" .ef •• ,.
'11_ ,. ...\Col." tl>e df.coin focal lCOI'1o
A .I.., Io.Ue.." 006r ,v DC, is I15Cd I., ,lot ,......U
IOI'CI I. CII be R-pl.ccol. opeli •• UI ,ta, co_"
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ot 'loc co~1 ,Id II ....... i.o t1l. fl •• I.
Pag.1
-_Foe""
.... ,

Thc incI dilm"c, of Illc 50.8mm adipIC! II 50.8mo:l « ' ) 10 lbll you COD UI'
I 2' OCUll1 [0' you, lclncop •. Loo.n lbc lock ''''C. of lb.c Idlpl« •• d like
ou' lb. VllOll blck "' lbc ,O.'mm 11.c'c. Th .. iOI .. I • 2' ocullr inlo lb.
'hp'., and lock it .... itl> tb. lock .cr .....
[DlaQlam 0' th, visual bl.~ l
R.v .... ino 10.> ,ioIg
A lu .. lvio, lock dOl i. p, ..vided wi'b ,be 50.8mm Id.p'er. Wb •• loo.ucd, Ibc
Ielap'"
Can be r..t.a .. eI f, •• ly_ nil I. v.ry ","oocai •• , .. h.n lk. 1.,1 ... [ you,
.... 'fIO.. ..d ".. d,lloul pri .... Ir. III II 7"" 111 •.
How 10 sat your 1'1,' OCUllf In'o 'he oculer adlplar
Tu,. ,he lock rl., coom'or.clo.k .. i ••• oel I .... " ,h. Il •• v. of you, 1'/ ••
..c.11I ltto 'h. ocullI Idlp,e, and ,.,. 'he lock ".1 c.l.k i.. rinoly.
Wbco you like
lo lIko out you "CUll', 'uri .h l ... k riOI ot.r-clockwl ...
LOCk ,Ing
l' I.' ocular
PIO·8

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bdo,. ro, I" 101'" 01 ", ... oo.,ieil obj«"" Tbi' ... iU , ... b rou bulellir
bo... \0 u. rool '.I.,.ope Old .q"'ori,l moun' .nd 'bon, you ... i11 be Ibl. 10
do ... 'ul ob .. ,.... do .... itbo", "'r ".obl. In tbe ol,b'.
I. T,te DO' ,be .'1» 01 ,b. m.ln 'ube, of 'be liod« .. ope, •• d of ,be vi, .. 1
N.t.
2. M..h bll •• elo, bo,~ i. 'be R.i\.. snd DecHo.,Io •. F., fortber del.. iiJ fo,
b..
l, •• io,. ref .. '0 ,b ••• pllOldoo fo' lb •• qullo,i,l mou.'.
J. SCI lb. 'uh. '0 mo", f, •• ly. 100 ... 10, 'ke e1.mp' lo, 'be R.I.. Old ,b.
o,.lIull" •. C"'CI eI ... ly .. 1.lble obj'" I. 'h di.,.o .. (II I 130..,
"""'1) II lb •• '0'1 pol.' of Ibe flOdU "del •. lookio, It 'b. n.d i....
fleld .nd lock ,h. e1,..,,,,.
Wben
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oli, • .,cOl fo, 10U' lel ... ope Old '0 ... ,I><! mOlD' d,i.io,
I. Tf1 '0 ..i ....... itl> I 1_ p""'" oeol .. (on 0 •• 1" wllb I 100, fo •• l l,o,'b).
o<llio, il io •• lb, 0<01 .. OdlpIC'. A' nnl, Iml,e1 io 'b •• le field
m01 be "'0. b .... o •• of belo, ou, of focu•. So op."'. ,be flH: io. ie ....
01 ,be c •• ".1 pld. 10 .... 1". could 00' '"' lb. ,"' 1."'1, r ••• I.d.
p.n d I><! I ..... I. 'b •• Ib ... ide. Tb .. , lbe ;011,,, 111 be ., ..duI1l1
r.c d.
t-Io .... 100 OIlk. i' .uro '011 ,be im ••• ceo,ered '0 lb •• '0" pOi., of lb.
nod.. ..,iel. i. lb. ..m. ".. .. ClU,bl 10 ,b. cel'" of 'be ..iew fi.ld
01 lb. m.lo ,.op.. If cilbc' of ,b. Im.,e i' "u, "f ,b .... , .. , ", .. k. lb.
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: 1'11"1'
.".mp' ,,, look II 'b. ".0 'b'ou,b y"o, Mcwloo"'2S0 0' >II
l1~d., I~Op.. Yo", 'r" c', b. 10 .... 111
.. d permao,.,I, dam".d b,
lb. focu.d 110 lI,bl.
Pllile 9

AbDUl Ih •• 1, cu,rent In th. lub.
WhCD you, ,elucop', latin. il oul !'DIII yo •• '0<>111, Is lot in tbe O.'~ld.
wh". tb. 'CGlpU"U' II 10 ...... Ib .. II you, '00111. Ih Ii, i. lb. lob .... ill
be 1II0~.d by •• dlut b.al frOIll lbc lobc lid th. p.hnuy mi",,,. At 'he ruult,
,,,,ale. ill tbe vi..... li.ld ...ill "e dillorred b, th. ,i. cUllnl i. 1II. lub •.
ultil tb. p,i", .. y ",lflO. il Idlpt.d il,.lf to the III i. lIIe ouU,d •. The
p,iml'y "'irro. of yo.. Me... loo~~ll I• .., 1., •• nd lII,et 1lI11 It late ••
cOnlid ... bl. leO.I" of lime 10 be .dlp'ed Itself 10 lbe outlid. atllp .. ".,..
to o'der '0 bAVe ,b. ",i"o, .dlpted to ,be oUflide terllperllUre ao Quictly ao
pouible, lbe p,i", .. y mirra' (ell II mlde i ..... ol" •• tioo of ·le''ib,o •• 1>·
10 '''If lbe p,im'ry mi"o, I. upoled du'<lly '0 lb. ouuide .ir. Wben y6.
Ill. 10 do 'au' ob.erntlon will> yoo. M. .... loo.;!!O. ,ato Go, t.he lad ,io •• od
'be cotl cop fim ao sbowo II <II, fll.s Ind I' .. e yo., Idueopc i. Ibe
lite 01 yo., ObICl~.,io. II leu. GOe bou, to mike lbe pr""'y mit,o. Id.pl.d
'0 the ,.mp ... IIU,. 10 Ibe "te. Chect if lbc lml •• 10 lb' V" ... field ,.
It.bU'led b.lo •• y6" "an '0 look " lb. obj,cl yoo lit. t. ob.c",.
If 'I>cre ,UOI;6. lbe ai, c."c., i. lbe
lube,
,mi." i. nd .ul of fOC:.1 l""t
like I;,y di.c ..... llb pillor .. Ib6 ....
i. lbe fi •. 6. I. lbe Illy dllel 6f
i ...... In .nd oul of f6eu •• lbe pill ..
io 'b. dll. Ipp.I'S ,up.ed"ely I<
,b •• >lb., .id~ I"d it fo,"'" 11 .... y.
J- __ C.tIC.P
•• ,liCltly '6 ,lie ",.i. 'ub. so .bowl
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flg.S
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on. li"'e •• ce.u,y to ",.te i""I" Il.blli .. d i. 'be ..ie... field ... " .. 00
.... 0.1.
·0 .... 1". to 'b. ... .. 'b.' cond,tio".. ,...... "" h'dly IUbilind by ",,1 ...
Ilf ('"ut. Sod> I "ilb' it nol .. hed fo' ""' wale~i ••.
Wbu 'be Ii. """nl ,. OUI 61 o'der. Ibe ; .. llel II lid ou, of loeu, 160t
lit. i1l111" '''0 io 'h Wiler, lI1ete"ol III 0.".
"W" .. lb' miuo' il Idlptod i"elf '0 lbe te"'p,m" .. io <.be 6olll~'. Itt
lb., «II Clp Illi. 0016 lbe ICe'il>,"o.b .. 11 bdo" y6 •• tsrt '0 Wild
111'600""(11 objcc,.. If 'be ''''ib'O.lb cell 11 kepI 6pe. If, •• the ",iflo'
bOl boe" ad'pled illelf 10 ,b. 6,,"i~. leutp".,.re. tile III cu" •• , w6"1~
,il. ..I;D 1. 'ho '.be p ... ibly by lb' tldi." " .. , ho'" ob .. ,• .,', body
"",p ... I." io I cold "i,bl. up,d.lly 10 tile _illl",.
Pag. 10

ill
Adjustment
PallO 11

TIle vIe .. fidd or I l<lu.cpe ilia h1lhly ml.oified lod 11"0" thot you ""'0
IIl1dly tlt.h, .0 the vic.. fielo, the objcol you like 10 .... To help you 10
fiod 'lie object It cUe io 'be vic.. field of yo., lclncopr, the liod" IC<lp.
witll wide yi.w lidd il p,ovid,d .. i'h yoa, I<l<loopo,
Tll
lee lh ....... c objeo, io Ill, TIC_ fieldl of llIe mlia 100"0 .. 0 lb. fiad ..
1I'0pO, yllO Olu", Iliao Ihc opticol n<l or ,he Illto loope IOd of tho fiod.,
1I'0po. Thoy muo, bo pltlllel <lell lllb .. U .... 0"'1 I. ,he fi •. 7.
The f1.od .. of yoo. Me_]oo~'O il 10 Illde 'II" it ... b, .,"d f'" ClOfyi ••
l .. odlo permloooUy fixed 01 'be ,,"I. lobi. OecUI. III LlIio .. ' .... ore, thr
<lp,iell Iliiamoa, III ,he n"det cOO be mldc by IlIlllltl, 1lI0 Ylsul boek of
l~e liod .... i,h lbe Idju,ll .. le,""". OlcI 11I.0.d, lb. "ptitll IIi, of 'be
lioder will .0' b.C<l"" Oul or o'der.
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Tho proct .. lor 1II1Inmtni Ilg.T
1. Sci I 10 .. po .... r oeulu (a'o the ".ul ..
Idlp'" of lh. "I<le"p. lad .'''h, i.
lhe eco", llt 'ho ylew field, lh' objocl
io 'be dlllla .. of Il I .... DO ..... Iy
(o,lIer .. ll. Ollt r..c .. cd).
2, '" 1i'1I, 1001... 'he lod ,i". IOd LlIn
Ill .... O III ,h .. o Idju .. ,.. lIC.e,," ... ll
ooou.h III "' 'll "ou 'ho yillLll blck f .. oly.
3. Hold LlIo vllulI b.ek w"h llOe horod I.IId
Idjul! til. pOllliol or ,he yil .. ] IIlek
no.bly 10 II lO "" 'he ob]co!, Clotht
,a the ceo,et of ,he Yi, .. fidd ..f ,ho
milo 'cope, II ., .... po •• ' ..f lho .. Iide.
Then, rl"'. the lock <ll. il blU "Iy
""i'b olher bond.
4. With I he ..... ooh p, .. 'idod, 'Onl tbe IlIrce
Idi.llio. Ie,""". lad 1'10 •• Ibe objo ....... Iy
" tho crO" p..iot. T~oo, fU1e1l <.he look t(Il,
Ihmly '0 Ice 'he ,i,oll boet io pllce.
You
"0 oow rceammcodod 10 do tb ... p'''''UI
----
10 ,II. dly';"" 10 1!I1l you clO I"" your Iky
.. ".bl". '1_I.t], i. 'be ollbt.
Plge \2

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'On "~I!'.TOd Il) fo!~"~' ',,,, .~, OlD! 1ll"~1 10<1 po. II'''' ~J>1l.'1 '~1 JO
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,QIIUlwnlll "'II 01 /i'''nllq "'II liol.lld"l:!
",doo. "PU!J ,ql
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-om 'ql JU .... ,ql]'q ''1' lon[p" 'I"I!J ''1' 0' JOJOli "pono. ~O!t. I ql!'"
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o,RJ. ·p.no. ~')P • 'II]'" 00 '101] .... 0''11 POI "!"'VO]' 'Ioo~ OUlntoA ''11 "0oL
"Ii~. ~"P ''1' "'111.
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.1. no~ '"'ll o •• do .. "Po!} o.x t ''1' 'I'!"" P'PIAO,d I! 101lO!wnm 'P]'" "
'Ol.o!wnlii "1'11"1:1

CoIH",",lq 'be op,ical nIl or you Mcwloll->!50 call b. ",.d. o.ly .. 'be
pilei of tlIl l.coldalY ",1"0'. Th<r<!o,c, yoo will .ucb "oobl .. o",. b... 110
wo,ka II '0 tbe N_,oo;oo 'ducop •. n. sccolld .. y "'i"o, i. III np .. d'.,
op,ic'l Iy .. '''' 10 'h' I, il 00 .... i';v. '0 ,he c.llil" .. ioll II,., • Ili.b'
",on", •• , of tbe dju'iJI. Ku", coo ",ak< 'b. oplial nil nl o! o'der,
, .. ul'io. io ,he hOi ... de.ud.d ,"Idy.
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'h. <oU;m"o" Olio. ,~. ,imd.,;om It'" ,"'".c, Ito 01',;<.1 uil hn b •••
compl"ely .djuI,.d beto,. 'hip", .. '. Tbe OpllClI .... or yOll, ,.1<1<01" II
ve,y ba'd '0 b. "0' of o,dor, o.co collim.'ed, ho' ~ ",I.b' b. "0' of o,d ..
dudn. "u.po,"';o •. Therefo, •• ;1 o,d., '0 ".. y"" 1<1"<01" io III bUI
cMd;'ioll, you bav. '0 h.p Ilw.yl ill Op';Y] III .... 11 colll",.,.d.
Refo,. you ,,"n '0 do you' '"t'o"ollll,,"1 "h .. ,v";OO, .ncr fill to chock ,r
lb. op,ical ui. i. io o,d.,. If i' Ihould h. foold 0.' of o,d." do ,b.
collim.tion ", •• t;oll.d II follow•. Yo," .oIIoold .. ,le 'he coll,ml';.a ,Il., you
'cle.cop. i' loft i. 'b. oUlOid. ro, 010" 'bl" IlOC bo." 1.lo-.lly ... 1,.
tbe "ar.
I. Sel«t I atl' bfiibl<,(", ••. 2 -3) lad bi.b., ,. 'b. '~r "'d c .. , .. It " ,b.
vi ... field. Wbet dofoco,ed I. lod OU' l,o", 'be fo •• 1 pllia'. ,be bI.<r IOd
oo,e, i", •••• ar. ICC. lucb .bc dift'lelio. ti ...... bo ... ;1 ,!I.e fi •. 10,
II 'be oplic.l ui. I •• Oll .. tl, Idju'.d. tb. «o,e, dOl. ,b. 'o"c' ';0.,
,be lotc,,,,.dla.. "0', lod ,b. oo,e, tlo., 'll rO'''' , co.e •• U'. ei,et. in
Ih. in", Old lut., illll .... 10 .... ,h. op,ial nil i.o "., of ord." lIIe
«o'et of ,be c"et. " Ie •• of!. Th.~. COIIO<'(OO 11 ,cqui,ed. (Wb<o ,he
locoli •• Ie .. , i. pulled do .. ~ '0 '0' POlLtlOO rtOm ,b. focal POI~t. 1"0 ca"
"" ,b. ill~c, illtlle, Towltd 'I' po.ltlo~, ,00 rIO ... lb. oolu iml.e.)
@ e•
COllimated
O'll' ...... tI''''. Pro_loco'
I. 100101
Oecolllm.ted
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flg.t 0

2, To coIU",",c 'bc op'icil nil. 'djn' 3 'OIl "f 'he colfecho, "c,e,," by
2.Sm ... he ... ,ucb p,o_ided.
Tbe ,b,ce cg'''e<ioa .. 'c .... p,,,.d wi'b I pUlbi". le,ew ond pulli ••• Cf.W.
I,. plDvidcd 00 ,he ,eco"dary """0' holdc, pllte. Wbe" ,he op'i •• J .. '" i.
00' or o,de, .. IboWI below. Idjall Lb. plircd le,ewl It ,he ,i'.'(I, •. II),
,li.b'l~ loo.ud, 'he puhiol IC,ew first lad 'beD ,i,b"oi", Lb. pulli",
.cu .... Wb .. 'h Idj""io, oore .. ' or' p".u,o"ed ilk. i. 'h II •. ll. IdJust
,he
".0 pai .. of the ICUwI It Lbe tI.b' lide wi'h the lI ... e p,ocedu,••
If ,he op,lcal nil il c""ec,d '00 mucb to 'be olbe, lide, lli.h,ly
lo",e. 'he 1',,111., Ic,ew lad l~ea ,i.h ... ,h. 1',,>1110' IC,.W, Rcpeal lbil
elmeClive wo'kl ua'il lh ap,lell nil I, eu'e,ed. Who 'h ceo'" do,.
,he
iooe,. Ibe iO'um.dill<, ud l~e aul .. ,io," I,e III •• eo I .. a COne •• ,_
IIC ci'de eve.. "'hu • "" ",".e i. deloeul.d IIt.ely. ,be 01'11<01 lXi.
il p.rfec,ly eolUmlted.
-1 ... I,.'.
II '~I op"e.''';1
1.0.' ., Of'" .,
'ho "phI. c",••, II
.. itII 'h • •• "."In"
....... , 1110 '~h" (1, ... 'ho "'h. o~.n!n,,1 (I,'" til •• roor ••• 1
·If III ,hfCc p ... ed Icrew, a .. 1""lOn.d '0" much i. I 'im<, 'he .«oad.ry
"''''0' OIi'h' .00le 0,,1. So, l"",e. ,b .. e .. ,eWI little h~ Iiule w',. elrc.
aefo,. ~"u fiai'b yo'" e"rrcella. "'o,k., ... Ike lu,e of III ,b. pulli.., le,<wI
bei •• well 'i'h' .... d. teepial ,be I .. a.dll~ lIIi"., 'Hlched fi • .,ly 10 pi, ..
·Some,itr.,u a ""' i .... ,. ,,, •• au' or .i.w 11.ld, ,f 'ho ...... 1 ...... a •• d.
Wh.o a II., ,ml,e IOU of lJ<. CUte, d~"a, yn, corrective wo,k .. "U,
• oo,ine ~our .. a,h, ,.pllc.ia. th. "'"' , ...... , lb •• U,."
·Tb. «oIC' of 'be diU .. ctl"o ,;., .,i,b' b .. dl~ be '«0 b~ 'he ceo'"
o.Ilr~ .. ioa at ,~. ,«oodlf~ mirror
'The Wlfeet'., .e,ew ... e 00' IlwI,1 pali,iaoed It ,be dt«.lla. "r "U-c.o-
,,,ii' of 'h< op'icil ui" !lofer '0 ,be di., .... below, .. here 'be ... mplel
,"OW," Idju", 'b. eaffeol,o, ""''''' are .how"_ !l«p i" Iniad ·pu,h mu •• 'hi'
Lb. pu'bioB .e,eW mUll be li.b'c •• d If'et 'bc p.lliol ,c,e'" il l"" .. oed, ODd
'poll ""'00'" 'bit 'be pollio. I .. Cw InU", be ,i,h'ued 'fter 'be pUlb,o. "IC'"
i, loa'eaed.
..11i"ll '''OW
p.,o ,0,1 ,,, ... ,"gOlly
/ /
po,h;"g 0"0'"
•
po,. ,Ill. '''0''
~
o~
/'
'01' '~11r ......
\
P.I. ,hi. ,e" ..
Ilg.l1
Ilg.12
Page 1S

IV
Observation
Page 16

Yoo, Me",loll--1S0 I, bl.bly .... p.ble to, .... ld. , .... of oble,", •• ,b. m .
pinul. IlU du .. e,", nd .eboll .. bOl NOT lo!ted Ill' lola, ob.uvOlio .
III Old .. fo' yoo to .Ie YOol lclel'Op' at ill bOIL pe,fol"l:loocc. you U.
,"commud.d '0 OpUI" yoo, lel .. cop. In ,~. "l.b" wb ... a«io, i. fin. ond
af,e, you, 'cl .. copc il .... 11 Idlpled ,,, Ibe oOtl,de IO"'p .. uo,e.
1. Mdllnill.dtion
M.IOmclllo. no be ell.cllt.d wilb lbe follow in. f""nol •.
(lbl focil I ••• 'b of I ,.I .. copl)
_M
(lbe focil leol,b 01 10 oCllo.)
Tb.,cl",., ,be .b"n., lb. foul \co,'h of .. O •• lll i. o •• d, lbe bi.be,
,b. ml.oiti<:&lioll. bccolllu. Rev."ely, lbe 10 .... ,b. t"eal I.".'b of ,..
ocul.. is ... d, lbe lo .. e, lh. 1lI0."ifi .. ,;ao cOO b. oblain.d. I' i ... Id II
.eouol lbll lbe oppu hmit 01 lb. m.,.ific.uoo II 20 X '0 lb. "1""."
10 'CIIl' or I Iducope lod lbe 10 ..... limi, il 1.4 X 10 II. The fo,,,,., II
'h. b'.bul efle.llY< mo •• ifi .. ,loo .. d 'be 11'" 'b. 10.'" .rr.elive
",11.lri •• lloD. Tb .. ,!o,., lb. bllbe" clfective ml.oiflcaliu of yoo.
Mewlo.-il'O ... 111 be SOO x .. d ,b. 10 .... ., 3' x.
2. Luna, Obu,uIUon
The m",," II 10 ,d .. 1 II',., 1<. ob •• , .. by b.,IOGe<' '0 •• II .... p ... " .. d
omOlo"
UlIo ..omCfI. Wb •• you Icc lbe wbol ... f u., tIlooo. il I •• onablc
fo, yoo '0 III II "' '0 X m •• Illficalio •.
n III ruJl ph bn 0 eOIl..ldulbl. Imou.' o! lbe 11J;b" "'bicb
IIli.bl h,m you, eye, If YOll ... iU collli ... e you, .b'CfVllioo fo' • 100' lime.
R
.... crul nOl to 'II 'ocb moo. rOJ I 10.' ti",. U.,oulb yOo< .. I<lcop •.
Th ... 110 I lot of .. Ilc,. ud nll.y. 00 lbe ......... To vicw tbeK eo,"pli_
c." llyl of ,b ... 00. Iud will .1 .. yoo • pl .. ,u,o. To obo.". It <0
d"'il, yoo .ee .0ill.l 10 do il It bilb., "'Iomca'io. of 10 X 10 lh.
'P"'''o,.(c",) of you, lol ... ope. Witb yoo, Me .. lo.~'O, tb. Idui ""JlI.ifi-
<llioll. lo obl .. ~e ,be '"ou "'ill be 2S0 X. Wbeo tb. -""oJ· is fi , try
'0 u.. '"00. It lbe bi,b... cff"li~. lIl'I.,fioltio.. ne., yoo ,11 b• v,.",
•ble
'0 <c. ",oro In d.tlil, of ,b. cU'UI Illd ,b. 1&11 ...bleb , ... bue 001
oo'iced ye'.
Pa,.e 17

8 ~ etl'l!d
"n"",! "ll.q nOA 'A!' <>"'11''''01
~,!q"" '~')lI'm""1ll l>qf!q 11 110'['1" '")Ij .10'11 UUI'I" '{"I pl1ll1od
-,q'n ''11 "pon ,.,11R'0 .. ""ad '11''1 '"0 '''''IllI)P-''''')'' 11""" .In" 'II!""
.. )nt" P" fl."01' Jll"qol' '''''"'10 OJ. "I,,"nl' "" pn '"10'110 ,oJ
oOIlIAI>I'lO JIOA 10j 'lql~UI ",q'!.q pur lOP]'" PI'!J "")" ''1' '''"111 '1 .. '1 ....
·.,llnoo .......d .....1 nn ,.u"op JI,' pUt "loq'O "J •• qo 01 '"]l "". O'~N.
1 .. ,lnl' JI~I pUI IItnqlU JOI IIOlll.ullqO "'
".,.Utd ''1' jO "'] "nOll noo ... ]. UllI!!'1ll01 q'!q"
'.Oll""!J!",I'" ""01 II "'Oltd .ql ]. 01 .(n un.q plq 00", 'p<to' <to ")
'0)'" ''1' 0''1'' """00. ''11 "0 "ll.0I1d ''11 JO '''"''H'P lalq"w,," P"1J
111'" .. , 'o,qL ".O)'''U)ol"o •• )I"IP ,u~llq ''11 <11'1' 001"']J]01l",
"qllq ''1' )1 ""'Id ''11 '.''''1<1 0' 'n '.I!J 11110 "! hlnl "'1' 1>'1""
".do"'!"1 ,nO. ''1 10IlUm.lI", ''']P'll' ''''l'n
''1' 11 "'''Id ''11 J" nil"'! lP"" 'n" ''1\ ... "0'" nOA ....... '1 ""!.l
'1 to!"" ''1' .''1'''' "'I<tO '''''Id 'AU'qO 0' no", 'OJ A,n .. ,.1 ''1 ,10m ')
11011""'"'10 AlI.IUlld"(

Bo,id .. vlu~J obnrvltioo, yoor Mewloo..:.!$O w,ll I,ve yo~ aoolher piUlUr<
10 tah rile photo. or vlr,ou Objooll 10 tbe .ky. To ouke ,he bUt ~.e of
yo~, Mo"'loo-.250, .old 'h lollowlo. ,a'I,~crlO" O"Y '''d,Uy, ,efo", ••
10 'hc phlo/vi,al! 'y"era <harl lUurrll.d 10 lb. larer p •• ,
1. PhOlollllpMnllwllh Ii'll p,lml loc~.
Thll II I melbod '0 I.k< .b. pboto of ItI' imll" o. the fil.o:I pllc,d It
Ihe foul pOIOl. 10 orlle, wotd., yo~r lelU<'Op. c .. ~ ned lik. I «10_
pholo leo •.
Wh.o '00 .Ik •• dcop... ky pboto with I~' prime fOCll .. yoo oICd • I ..... Ii.,.
'"poa~n fo' 30 1o 60 ra,nlu be ... " of tho lu. loell I ...... ODd dllk
focal fill .., Tbcrefor<, yoo bon '0 no I buoy du,y lod ~i.bly Icco"cy
raoool, Mor.oo«, I 10Por ICniho. ru", .,ay be r,~"t<d to 1lI0rln Ihe
npolu" rime_ Tb .. , you w,ll b •• bl. 10 otH~io ...... d .... It io yo",
""opbo,ol,lphy.
"'. lhe Iml" of ,be raooo cn h. Ilk ... 00 rile til., II 1111' II 1/l0'b of
lbe 1..0.1
leol'h, 'b. Ira... of ,be bolf moOD will 1>0 jo .. like.. O«tic:IU,
00
,b. ]5m ... Iilm. Tati •• 1I" .. ph ..... I'"ph wilb 'ke p"",. 10CUI, Ule • JSm",
CI.,OII which elO
be oc, '0 ,he vi" .. l hick ..1 your reluoope willi TSC
Pri.,. I'oc.a RID •• od • T....,ou'.
Palll 19