第一个镜头
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( w6 A# q; g6 q% }( O( awww.astroview.com.cn140APO objective #001
5 |! }% r* F: P6 K天文家园欢迎您！天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪! {9 I+ V' l! v9 M

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& D; ~  k$ K2 b/ I  uwww.astroview.com.cnTEC opticians Edward Trygobov and Alex Richenko holding a TEC 140 in the raw天文家园欢迎您！$ S4 X% W  `2 }+ [3 E0 k

  B& E6 x- _: k; S% D天文家园欢迎您！[ 本帖最后由 siqingtan 于 2008-8-28 17:46 编辑 ]

0 A3 W! h7 `  W1 n( S! \, h天文望远镜器材评测和交流论坛# U- a$ U  j: ]. g
Color correcttion for high quality Fluorite oiled triplet 国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材4 k  K5 F( s/ @8 j) ]+ P

: y5 J" F! w# p. i+ s7 e( J天文望远镜器材评测和交流论坛Designed and measured correction of APO140 #06X
1 o) T# Y) X# y- dColor diagramm of different stars ! c# p- n+ y% G4 ^
[/url]
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. H/ S, C/ H. e; f' P, ~6 nwww.astroview.com.cn天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪) m8 F  N* w- j' p) f! Y. m
New rings for APO140
5 J  N$ _# e, I7 k天文望远镜器材评测和交流论坛
& ]5 [. a* ]- _- K/ pwww.astroview.com.cn
( j* Q3 Q: |6 M国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材[url=http://www.astromaniak.pl/viewtopic.php?t=1171]http://www.astromaniak.pl/viewtopic.php?t=1171
# Y6 d/ V' e7 x; \天文望远镜器材评测和交流论坛
* @! e& Y% Y8 I; H8 I* S天文家园欢迎您！[ 本帖最后由 siqingtan 于 2008-8-30 18:29 编辑 ]

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- Q# g. w( m! T, N( Q9 ewww.astroview.com.cn天文望远镜器材评测和交流论坛: g- @6 x; ]$ m
天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪  N8 w' ?- e# k

4 j9 r3 F) u- o' V$ H天文望远镜器材评测和交流论坛
8 I# ^' M' Z0 t% z  d天文家园欢迎您！
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Test in Japan (vs. AP155) 5 O9 `1 v9 F) c5 x8 A/ O( X) b

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when it comes to thorough > testing and his one drawback is that maybe he is not天文望远镜器材评测和交流论坛9 x% E5 j/ @. Z' A' [3 Z
国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材6 Y! z# w" r! {6 E7 Q7 O( _8 ?4 K

very diplomatic with his assessments. But he is honest in and only > wants to help. I told

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him to give the scope hell and really check it out closely. FYI, here is his report:

& S0 _& b- O& G  L2 q  y6 E国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材

-------------

天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪5 _% J8 n3 ]9 M/ f6 Q0 k+ z

TEC 140 APO TEST REPORT, BY M.T. (JAPAN).

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TUBE ASSEMBLY

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Lens coatings are hightly anti-reflective and of excellent quality. Lenses are not blackend

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on their edges.

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Dewcap is long enough to block stray light from entering but dewcap interior is anodized

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and reflects the light that enters into it. Light absorbing flock paper or felt applied

' |' m( O0 F8 ?. q+ X+ q天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪

to the dewcap`s interior might help reduce these unwanted reflections.

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There are only 3 baffles inside the scope. TAK uses 5 baffles and my AstroPhysics SDF155

# B4 ?- I* S" {3 ?天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪

has 16. The black painted tube interior is rather reflective of stray light and this bothers

天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪# a: n9 F) m9 h& v( u) n

me.

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Focuser internal baffling is accomplished by use wavy edges located around the focuser

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interior. My AP as 13 of these wavy mini "baffles" and the TEC has 12. This number

国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材9 f0 p, W) V2 X8 H' f

is definately enough for the job and no problem there. However,the TEC`s focusers baffles

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reflect much more stray light than the baffles on my AP.

国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材7 ^9 O( |1 r. F" d, e; E9 P" w

Focuser is extremely robust and the feel of the micro focuser is quite excellent. However,

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making small adjustments with the microfocuser is hard to do with gloves on. Also, there

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seems to be a backlash of about 1/2 a gear tooth when the knob is let go.

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TESTING

天文望远镜器材评测和交流论坛6 C, [+ S* \% C' N

I tested the TEC 140 7 times, on 4/9, 4/10, 4/13, 4/15, 4/16, 4/17 and 4/21, for a total of 12

0 b; ~/ C/ h5 [3 M& `天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪

hours of actual viewing time. Viewing times were generally from 7PM to about 10PM.

国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材; d9 v7 a% R& u9 R3 `' h

Outside temperatures dropped about 3~4 degrees from a starting temp of about 15

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degress C down to about 11 degrees C. Interior temperatures were about 17~20 degrees

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C at the time I took the scope outside for testing.

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VIEWING LOCATION was in the outskirts of U. City, for the planets, moon and fixed stars.

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Other objects were observed on Mt.T. at a height of about 500 meters and at about 3

& ]8 q2 b5 r' A3 c! s" A天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪

degrees Celsius. I asked my buddy S-san to join me in order to get a more objective impression

国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材% g; A: b* x  a

of the scope. We used a 2" TV Everbright diagonal mirror.

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EYEPIECES used were the NAG 4.8mm, Nag 9mm, Pan Optic 22mm, Vixen AV 4mm,

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Pentax XL7mm, Meade SW6.7, Baader Eudiascopic 3.8mm / 5mm and 10mm, GOTO

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Optical OR6mm, Kasai OR7mm and Nikon OR9mm.

6 S5 e/ x: Z: ]! Z! M天文家园欢迎您！

BARLOWS: TV 2" 2X Big Barlow, Baader 2" Flourite Barlow, Intes 2.4X and Kokusai Kohki 3X

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barlow. For direct comparisons, I used my AP SDF 155 telescope, applying a 140mm ID

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aperature mask.

国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材' `% i; |* k5 f5 m
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[ 本帖最后由 siqingtan 于 2008-8-29 22:53 编辑 ]

OBSERVING IMPRESSIONS:天文望远镜器材评测和交流论坛$ V. h. A8 [: x8 i# i: ~% O7 `% Y% J

SATURN Observed outdoors for about 1.5 hours.

TEC天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪0 s) ~; O1 i) c# a
Extremely sharp image. The entire Cassini ring was visible and equatorial regions both
/ @7 h  K& |" T& c. z天文家园欢迎您！faint and distinct were easily discernable. Background was a little bit bright, and seeing
% m0 ]! j* U  D5 A7 @- }国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材somewhat unsteady.
; ~7 P2 n  a9 |' G5 f7 e天文家园欢迎您！AP (at 140mm)
! M3 ^2 o& u' G" P/ H8 s天文家园欢迎您！Could NOT see the entire Cassini ring. Equatorial regions both faint and distinct somewhat
' u5 d# I* P, J4 n& ?天文望远镜器材评测和交流论坛visible. Background was distinctly darker than the TEC. Background was dark, seeing
1 w7 V! i6 G- f/ t$ l, J. P% Overy unsteady.天文望远镜器材评测和交流论坛0 S3 t- s9 e- w* ~" s5 J
AP (155mm) without aperature stop:天文望远镜器材评测和交流论坛4 U0 Q4 A- h4 v: S  W
Equatorial regions somewhat faint but color / grey scale rendition very good, while contrast天文家园欢迎您！+ A3 \" X% g% O
was somehwat low天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪. L$ _* I3 F2 m# P# `. P
JUPITER Observed outside for about 2 hourswww.astroview.com.cn0 w4 S  y) w9 t! V; h* L; o
TEC
' a# V: D# p4 }& Zwww.astroview.com.cnJupiter`s edge very distinct. The two main belts are very clear and almost leap out at
4 Z, h" Z. J4 N& F; p# R2 t天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪you. Image overall is very white. Jupiter is extremely white overall. Tiny belts were certainly天文家园欢迎您！. n0 `" y) F7 O3 y
visible but the overall planet appeared somehwat mushy, with a lack of 3D feeling.国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材- `( k& Y+ n5 o
Seeing on the steady side.天文望远镜器材评测和交流论坛$ Y6 A/ j9 q; P) o4 ?1 g4 G' l
AP (stopped down to 140mm aperature)
" \7 D% M& J# \+ j* \* Y1 X) a国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材Image is somewhat soft. Contrast not so high but color rendition very good. Image is! a1 D; c4 f0 q
somewhat darker than TEC and image looks somewhat yellowish. Seeing very unstable.天文家园欢迎您！% v& d- ^4 e* \5 ~1 k/ k" s
AP without aperature stop: Image is brighter than TEC but color/grey
, j! v$ O- r, W9 r5 n天文望远镜器材评测和交流论坛scale rendition was about the same. NTB/ NNTB/STB`s very faint areas are easily visible.
/ x) w! I8 e& r6 U9 w天文家园欢迎您！Could not see these areas as easy on the TEC?天文望远镜器材评测和交流论坛& C3 ]- F0 d( y% T. Y1 g
MOON
) E1 u5 v  J( x/ I; Q- F  V" \天文家园欢迎您！TEC
; d3 `0 b9 h5 u! Y& K$ J国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材Extremely white image. Crater walls are so sharp they almost hurt my eyes. Seeing
; N7 b% R3 k; c0 ~- E" [( ?0 U( cwww.astroview.com.cnsteady.国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材) V( N/ O+ A* [8 q: \
AP without aperature mask; _' w* @4 ?$ N
Somewhat yellowish. Image is sharp but the unsteady seeiing botherd my eyes.
- u2 H! F. |# e4 W8 p8 M$ N8 H天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪FIXED STARS: Castor, Pollux, Algieba, arcturus, Mizar, etc国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材+ Z- B* y  E0 k" \3 q8 J6 K$ x7 G
TEC
: z5 x3 h& q: t5 Mwww.astroview.com.cnBackground is whitish. Airy disk is extremely small. Though still visible and perfectly round,& J5 W; o& Z% M0 z/ A6 v3 {% f
the scopes needs to be cooled down thoroughly first in order to see the entire ring. Also,天文家园欢迎您！4 P# S( {7 A! T& e' a" ~3 g
while the scope was cooling down, I witnessed that the Airy disk would change shape
& C7 d, p5 _. a1 F4 T0 `slightly until becoming a perfect circle. TAK FCT 100 would also exhibit the same behavior.
0 p) N3 v" m: Q- x, v0 V+ v2 L. {天文望远镜器材评测和交流论坛My AP did not show this behavior.天文家园欢迎您！/ d" ~9 u( o1 z) j3 k
Second outer diffraction ring would form a delicate circle. For 1st mag or brighter stars,: X5 P7 ~* x5 q% D
a tiny bit of red color was visible.4 g  \- i' |1 F
AP国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材2 H6 k; G6 V  ?* P# H9 d" T
Image was not quite settled until after a 3 hour cool down but the Airy disc was perfect
4 ]" ?8 n, P* e( v2 @3 U天文望远镜器材评测和交流论坛and the secondary diffraction ring was beautifully visible. For 1st mag or brighter stars, a) Y6 G  ^) ?% z/ ?2 i6 i
tiny bit of yellow color was visible.
6 I7 S( T6 X6 ^9 K* n5 J天文望远镜器材评测和交流论坛OBJECTS M4, M44 ETC.
5 u" t$ O1 S6 p) ~; T0 P: u国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材TEC
: T7 m/ [7 I* y8 Q8 Q天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪Stars were pin piont. Seeing good. Background was whitish and stars did not stand out
; u( o" [# Q3 i国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材quite as much as I would like.
/ z0 s! s# O# ^3 f5 s天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪AP天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪( m/ x6 `0 m: w
Seeing conditions were variable but stars are brilliant pin points. Background is very dark
+ K# \, v8 U8 _# ]1 j: G7 @www.astroview.com.cnand image is very transparent.4 g3 N2 I! F5 R( C% f8 F* ?
IMAGE IN AND OUT OF FOCUS
. }, F/ O/ D5 y4 ^$ A, W# I) ?  l/ ~国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材TEC天文望远镜器材评测和交流论坛2 |# N2 N( q, }
A virtually perfect textbook image both in and out of focus. This is my first time to experience
/ x) b- p  h" ?- Z% y1 O国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材such perfection in this regard. My subjective evaluation put the optics at 1/8 to天文家园欢迎您！5 S! E" u0 A3 k2 A4 x
1/16th wave but I have no way to actually test this.天文望远镜器材评测和交流论坛. B. Q* {% j: {8 M: _
AP
+ Q! c& C! b0 `4 v. d- ~www.astroview.com.cnImages in and out of focus loose contrast slightly. Maybe 1/8W quality??
0 |$ ?" g' d( Bwww.astroview.com.cnRONKI TEST
% I: ^, u9 H; t& r; q8 f0 p! z天文望远镜器材评测和交流论坛I used a 200 line [per ??] Ronki test film I got from Tenmon Guide magazine天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪# f0 }4 t6 K/ m% r8 g3 u* L' `
TEC
8 P$ J) {+ v1 GAlmost perfectly straight but line cirvature at field edge seems to indicate a slight overcorrection.
& y; b  W3 O$ [; R" ?* l$ F天文望远镜器材评测和交流论坛AP天文家园欢迎您！) Y, t3 B: w) V0 s( T4 p: Y3 D
Lines similar to the TEC but line curvature at field edges is even more pronounced.
) e0 G. W5 i" t3 S- k! z# j3 N国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪' Q" Q# M5 Q. ?4 D
[ 本帖最后由 siqingtan 于 2008-8-28 17:54 编辑 ]

MY TEC140 IMPRESSIONS天文家园欢迎您！% S+ a0 t8 _" t3 F
Chromatic aberration, and speherical aberation level is probably the best天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪9 _5 N8 ?. q- B9 d) O
I have ever seen and very good.
( ^: r) {5 B' l8 N, r/ f; j: S6 x天文家园欢迎您！Images are plenty bright.If my AP stopped down to 140mm aperature reperesents "100",
$ i% e  k2 \& z7 C3 w8 y9 Y4 s" H9 ?国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材the TEC would be about a "130", with the AP at full aperature being about a "150" in
  W9 [4 I  _0 ~4 I0 T$ ~4 |( k天文家园欢迎您！comparison. Also, the lens is extremely color free and images are very clear and distinct.% o' S0 p5 j- O2 Y# p# k9 b
The TEC cools down relativly quickly in the field. The AP`s fatter tube and the many baffles天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪. m0 q/ x$ a1 x* t7 s% h; [
(16 in all) might look good in the showroom but too many baffles might impede the
1 v) x7 J- c) f国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材flow of air, this possibly causing an increase in my AP`s cool down times.
0 t/ C1 S" ]4 F  u7 s& o. y2 p天文家园欢迎您！However, no matter what object was observed, the TEC had a noticelably brighter and天文家园欢迎您！7 q/ x& s  T. j* I. ^5 R2 J2 G  X  b
whiter background than the AP. I feel there is room for improvement in the interior paint
2 K/ B3 K+ X* k; q! \天文家园欢迎您！job of the TEC 140.天文家园欢迎您！+ w9 Q4 d. t9 ^( p
A scope`s performance relies on more than just the lens. Lack of contrast hurts detail in天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪: a, m1 N3 v  u7 \6 z6 @
planetary images and also inversely affects deep space objects.
' r* |* B- O, L0 Y+ ?: e& P5 C# SI feel an improvement in contrast is imperative but just adding more baffles is perhaps天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪" O9 {  i: J7 ?9 f1 H2 u7 G/ h1 [
not the answer. It is best to perform a more balanced improvement that perhaps adds国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材5 u& l8 c5 Z% k  m, C/ w* ?6 C
some baffles and also paints those baffles with decidedly more light absorbing paint. Or
( [; g6 Y+ r; G2 M, A% ^, [# c5 X/ h国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材how about applying some highly light absorning black flocking paper? Edge blackening
' p. O* m* _# d5 Z天文家园欢迎您！the lenses might also be a good idea.
; ]1 J4 L0 ]; p, r: w1 N% i0 E国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材The merits of a 14cm refractor include: excellent compactness, higher contrast, exceptional
" s% d" _2 x- b# _6 Owww.astroview.com.cnresolution, adequate light gathering power and quick temperature acclimitization
: |/ ^" B2 p6 T& P& a# b国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材for maximum viewing efficiency. By fully utilizing all these qualities, we can look forward
$ c" C. \) q, s$ y2 o% l+ S天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪to the ultimate observing tool.

结论是什么呢?有中文的解释一下吗?

TEC也单卖镜头？

请教一个问题，为什么back focus是图里的那一段从调焦座后到一个平行的平面，而不是到物镜的焦点处？

因为那段虚线就不是焦点吧

TEC 140有人说非常好，有人说有些色差，而且色差比TMB130F6要“大两倍”，不知道大两倍是什么概念？这种有争议的镜子，真是要自己看看才知道是否符合自己口味

引用:

原帖由 tigerr 于 2008-8-28 20:18 发表 天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪6 ~% O6 G; J0 M/ A% C: w
请教一个问题，为什么back focus是图里的那一段从调焦座后到一个平行的平面，而不是到物镜的焦点处？

" s: z0 x, Y$ x% q+ _, p2 w7 e天文望远镜器材评测和交流论坛 那个平面就是焦点像平面，这个图画的是正确的，通常我们观测时都有一个像面尺寸，他用虚线画出这个调焦座到焦点能有多大尺寸的像面。

不错 看过了 留名下