Jay Reynolds Freeman 对AP 'Gran Turismo'感受(页 1) - 天文器材讨论版 - 天文家园欢迎您！天文望远镜器材评测和交流论坛

siqingtan 2008-9-8 14:33

Jay Reynolds Freeman 对AP 'Gran Turismo'感受

写的很祥尽,对比也不错,这个终极便携镜子是真不错bbbb4
Jay Reynolds Freeman wrote:r JT-TH&H
> Saturday, September 6, 2008, was my third night with my new
> Astro-Physics 130 mm f/6.3 "Gran Turismo" triplet refractor, which I
> received shortly after the Fourth of July. I keep thinking I should
> call Guiness, because I suspect I am the only person to have been able
> to buy a late-model Astro-Physics refractor direct from the factory
> without having been on any wait list for it, but that is another story.
>:QH kTX,_b;L
> All three setups so far have been at Lick Observatory, in support
> of
> the Summer Visitors Program. Summer evenings on Mount Hamilton are
> often superb, and September 6 was an especially fine evening. I noticed
> a temperature of 102 F (39 C) on the high school sign as I drove upD'xM`N`I\4|
> Quimby road late in the afternoon, and that translated into shirt-sleeve
> conditions on the mountain top all night long. The air was calm, as0iTgR3^OH| ~
> well: I usually bring a small telescope on a very robust mount to Lick,
> so that I can be sure to be able to show things to visitors even when
> the wind is blowing and everything is vibrating, hence the Gran Turismo
> was seriously over-mounted on my Losmandy G11, but it was not necessary
> this time. And as sometimes happens in such conditions, the seeing at jC3dhpG_!q'D z
> dusk was superb.
>
> The Gran Turismo is tiny. With the sliding dewcap telescoped back*_gwTsv r5]
> over the skymost tube section and the large, long focuser racked in for
> transportation, it measures only 71 cm (28 inches) long, and theo~!|4UY8}mW
> different sections of the tube -- which come apart for even more compact#^Z&J T [xYl-e5oi
> transportation, if you wish -- are of different diameters, rather like a*Fi9voW?'m&N"A~
> cartoon telescope, so that the overall effect is of great compactness.0Px7wL"_ }h:z
> The instrument is easier to set up and handle than my Vixen 102 mm f/9
> fluorite, or my Vixen 90 mm f/9 fluorite, or even my Orion 120 mm f/5
> rich-field telescope, notwithstanding that the latter has a shorter --D"y0~ jGa
> though not less bulky -- tube. The Gran Turismo is heavy, though --j L1y q;zs2mc+m
> there is no denying the weight of that lens, and the rest of the opticalS xls&m6Fx&m
> tube assembly is solidly built. Nevertheless, among small refractors,}W-Q ViX
> this instrument is a high point in portability per unit aperture.
> {e,Y|f\
> Roland Christen's optical craft is well enough known that it would
> be superfluous to rant about how good this telescope's optics are.
> Suffice it to say that the instrument showed no trace of color, split
> double stars with aplomb and with textbook-perfect diffraction patterns,
> and showed a wealth of fine detail on the Moon and Jupiter -- probablyM0fC z6rz
> more than I could appreciate, since I have never been much of a n.I#xW)j `9\+I0N4[
> planetary observer and do not really have a developed "eye" for it.
>4Za1N4R&wD
> What does one show visitors at a summer star party, anyway? The`M3N v;UO:j h
> area where we set up at Lick is to the east of a long building, which
> blocks the low western sky, and some of the horizon is blocked by trees
> and other buildings. Furthermore, though Lick often has wonderful-RS } p"lgE
> seeing, the sky so close to a major urban area is rarely truly dark.
>
> As you might expect, I stick mostly with the bright and the
> spectacular -- on these three nights with the Gran Turismo, I have shown6Y7t'he%~"H!K
> the Lagoon Nebula, the Omega, M22, M13, the Ring Nebula, the Dumbbell,OQS#xG
> the combination of M31, M32 and M110, M6 or M7 in the early evening, and
> perhaps the Double Cluster later on. All these objects show well in low$mL[9V{.V%y
> to medium magnification fields in the Gran Turismo. I usually use Vixen
> Lanthanum eyepieces at public star parties, both because they have a?d"Ay$?nS
> uniform long eye relief and because they are not my best eyepieces, so I!Bg+f-t bE
> have less worry about mascara and fingerprints getting on them. I have i4A"\z!Ud r_^4`g^
> a 30 mm, which is actually a wonderful wide-field eyepiece, a 24-8 mm
> Zoom Lanthanum, which keeps a reasonable apparent field of view&b6IZajK ]
> throughout its magnification range while its "zoom" feature saves
> changing eyepieces often, and a 5 mm for a little more magnification.AX~|MR7DA$f K
>
> Double stars are spectacular as well -- I usually stick with pairs
> that show color, as a matter of interest, like Albireo, epsilon Boo or
> eta Cas. Zeta Aqr is not colored, but is an excellent example of a
> moderately close (for 130 mm) pair of equal brightness, that can give
> newcomers to astronomy a sense of what looking at double stars is about.
>3F,a3tXdW4KGj_\
> Sometimes I show something more challenging. A wide-field view ofVKprl1shh
> M33 usually allows everyone to see at least something, since the very
> core of the galaxy is fairly bright, and the subtlety of so many stars6ihr1p*I.EIE"\F
> so faintly seen brings oohs and ahs. So also does the thin edge-on view
> of NGC 7331. (On my own, I did find a trace of Stephan's Quintet at
> 102x, but it was very difficult to make out in less than perfectly dark
> conditions, not so much because the sky was bright -- at 102x itm'at'bN0g*A
> appeared plenty dark -- as because of ambient lighting from the Lickz;e0^5j O7z1f8Jn!~0Z
> Observatory main building itself.)
>
> The real treat of the evening, however, was the Moon. I was
> pointing at it as the sky slipped into twilight, while the Lick visitors
> were still being entertained by the concert. The terminator lay just
> selenographic west (I will use selenographic directions herein, so that
> "west" means "toward the eastern horizon of the Earth") of MareE7R5S4_*MS
> Tranquillitatis, with the eastern end of Rima Ariadaeus exposed but the
> bulk of the rille trailing off into darkness. The seeing was excellent,
> with moments of crystal clarity, even at 292x (Takahashi 2.8 mm
> Orthoscopic eyepiece). In this area there is an easily recognized arc1l&nYyTB1X
> of smallish craters, comprising Sabine, Ritter, Ritter B and C, Manners,
> and Arago, which I have always been fond of, because in 1951, a
> science-fiction club which I later belonged to (in the 1960s and 1970s)
> presented a claim to this region to the United Nations. It was denied,F+gb pw&FO!s^^k
> but when the Apollo 11 mission landed nearby in 1969, the Elves' Gnomes'
> and Little Men's Science Fiction, Chowder and Marching Society of7n2w[0DhA
> Berkeley attempted to bill NASA ninety cents an hour for parking.
>
> Pay-lot fees or no, this arc of craters is a good entry point for
> observers wishing to study the area of the Apollo 11 landing, and the
> conditions on September 6 were good for doing so. The area is shown on o NdE ?DQ4w
> Rukl chart 35, with some features of interest on charts 36 and 46 as
> well. Draw a line from Arago to Sabine, and turn exactly 90 degrees to
> a generally easterly heading. Whether that turn is left or right\'U0vg&C_7|'sD
> depends on whether your telescope is inverting or not. Tranquillityb MWy;qI S
> Base lies on that heading, about 60 percent as far from the center of
> Sabine as is the center of Arago.b_*F,`;_Y
>'Uk-B-W#Ci
> There are a few useful features for identifying the location more K,|&q|*zM_
> precisely -- not too many, for that first landing was in an area
> deliberately chosen to be free of hazards. But a good place to start is$oO2?0z)Pn
> with the small craters Moltke and Maskelyne G, the first a little south
> of the easterly-pointing line, and the second somewhat more north of it.AY[kr1G`
> Draw a line from Moltke to Maskelyne G, and a bit northwest of its|U@$tTlg
> center find the smaller crater, Armstrong (formerly Sabine E). Itsze3N|hV;C!j
> 4.6-Km diameter showed steadily as a crater with a shadowed interior in%Zp*{]0j7^^{!t\(J
> the Gran Turismo.
>
> Now aim from Armstrong back toward Sabine. About a third of the
> way
> there, find the smaller crater, Collins (formerly Sabine D). It is 2.4
> Km in diameter, and showed in the Gran Turismo in moments of steady {1[;K1tD
> seeing. About half way from Collins to Sabine is Aldrin (ex Sabine B),
> whose 3.4 Km diameter made it perhaps a little easier to see.6QRB m#wqE
>
> With these three craters located, draw a line from Armstrong toOy{1a c,b6z;}
> Collins, there turn 70 degrees toward the south, and proceed about twow3cCnv
> thirds of the distance from Armstrong to Collins. That is the location(f8L'P%FB,Xq
> of Tranquillity base, and though there is nothing to see there in the[]Y.h*[
> view through any telescope that I have ever used, using these three
> small craters, named for the flight crew, as guides, should allow you to&p1lT'F5s Ev,dM
> locate it within a reasonable walking distance, even in a space suit.tCXi'Q&t
>
> My records of lunar observing are not well organized, but I am not#Md,L*?,M(~*i#`-J
> sure I have ever seen all three of Armstrong, Aldrin, and Collins}!r D&ZH/k;RF7W
> craters.x#eAy1bte%h0l
>
> Now let me see, the Apollo 11 LM descent stage has been there for
> more than 39 years. At ninety cents an hour, the parking fees would be
> well over 300,000 dollars, plus interest, even if we did not issue a
> ticket ...:T ]%G sZ{6g,Od"}
>
> -- Jay Reynolds Freeman*NF#j"gJK)tV
> ---------------------KDYuC;d[.g ` z
> [url=http://tech.groups.yahoo.com/group/ap-ug/post?postID=uJIscI0KKXYyp7e5_V-ZQHU9V4Sw9yOxn8oZDB_mFIBlXwDFFctfMjxa8aCBbfoTBEgnZU1s1sv2naUcLqdD8OiDh2P_m4s][color=#247cd4]Jay_Reynolds_Freeman@...[/color][/url]
> [url=http://web.mac.com/jay_reynolds_freeman][color=#247cd4]http://web.mac.com/jay_reynolds_freeman[/color][/url] (personal web site)

[[i] 本帖最后由 siqingtan 于 2008-9-8 14:37 编辑 [/i]]

siqingtan 2008-9-8 14:35

另一个爱好者对他的回复,侧重于观测的乐趣,和他的AP情节和家庭趣事,文笔很精彩
一并转来参考一下bbbb1 3g!IKDnG$BK2s
Jay,vwrKHQ7n@`
Thank you for posting your report today. I was a huge fan of NASA as a
kid, and I still love reading about the Apollo program. Years ago, whenX/Joj%ZwV
I followed a few user groups, I enjoyed your observing reports very4QF|C"Lam/@2S
much, and this one is no exception. Often I have learned something from
your posts. Reading your account today makes me want to share my recent&moF0L l1[_:G3E
AP experience - first light with my first AP scope. Warning: it's long
(sorry), and may not be that interesting to most people.Q8tB T"t-dr,s!M
Vps.}k&n4ss'VU
Some years ago, I put my name on two waiting lists. My GTO 400 didn't
take more than a couple of years to arrive, and I quickly replaced my C8
alt-az fork, which, with the addition of digital setting circles, had"Jg bB$NB
served me fairly well. Then, a Star master 18" supplanted the C8 as myO"zq4O LJ z[ ~{
favorite, and the GTO 400 went into partial early retirement. This past
June I received an email, quite unexpected, from Astro-Physics. My name
had come up again, this time for a chance to own a 130 Gran Turismo.
After checking the AP website, it took less than a NY second to decide
that I had room for such a scope in my collection.r0j]_&WNsb-x0o
)rU Gs&C0K)W{
First light for me was Friday, Sept. 5. I work half a day on Fridays,
and after I finished my last procedure, a root canal, I opened two8FX f7jm2US;n
boxes, one with the scope, and the other with all the other goodies. Its l#N'[8LjQ"nO7K\
was like Christmas and my birthday, both at once. The scope isUSa1S6gqp
wonderful; I agree with all that Jay has said. This is a solid scope,S;A)RL PhK.?I
and an easy one to tote. After a while I had to make myself quit-f}7g8ylnd7b
looking at it, I had to get moving.4Rr8ur;N:U ig7?

I took the scope home, and mounted it on the GTO 400, with the original
Celestron tubular steel tripod and an extender of my own devising, a 3"V$mE)J`^0Kl!i
tall laminate cylinder of walnut and fir. I picked up my 3 kids at 6
pm, went to the local bookstore, and then to eat. As we drove to my3t0Y4J%C[W1n;Q2r K` X
house at about sunset, the sky was beautiful over the southern Atlanta[q#w}!`E$`Q%k
suburbs - mostly cloudy, with all shades of silver, blue, and gold - a
wild sky. As we pulled into the driveway, I explained to the kids that
it was cloudy for only one reason: in the house was a new scope.E!^6G2r1wH:wy)MV
)O(Pg.n'P]
The children used to help me observe back when I used the C8 for5Wi1g,f$i'iL'T
driveway astronomy. Back then they would take a look, agree that it wasm7vL)nb"Jz
good, then go back to whatever they were doing. Even a lunar-planetary8RXX6Q ty+E/A
transit (Saturn, I think) at high power a few years ago left them
somewhat less than impressed. Now that they are 11, and they have a bit
more interest. After all, 6th graders know a thing or two.
j&P5{D*CEw
After explaining to then a little about the 130 GT (I wanted them to|0C*U"|,k3]4u+W4m9_
have some appreciation for the quality and rarity of the scope), weO/uFl(F(YX
checked the sky again. Most of the clouds had evaporated or blown away,
so we set up in the driveway at a spot guarded from the nearest
streetlight by a conveniently located tree. The setup went well. k u f"\} w.ei
Before too long we had rough polar alignment. Polaris was hidden by
trees, too, better than the streetlight. So, we set up the mount byh N3HhIH{U$wO
dead reckoning and leveling the scope in Park position 1. Quick andP3MV\r-E\
dirty, and good enough for pointing to Jupiter even without a finderO{yef/s
scope. With the 55mm TV Plossl, the 130 GT is kind of its own finder
scope - well, that and sighting along the mounting rings.+J#_1`^g*C
v5a%NG,W(_0vm
So, first light found us at Jupiter and the 4 Galilean moons. We all
got to see it from 15x all the way up to 68x (12mm Nagler4). Seeing was
the limiting factor, with the view shimmering when we tried 96x - with
the 17mm Nagler and the Big Barlow. I explained a bit about the physics
and human observation history of Jupiter, enough to _almost_ bore then7|7Yt#@"h!{&L
kids. Then, a quick recalibration, and on to Vega. At this point, my ?1@\.?!vN&n
daughter dropped out, and went inside. We boys zoomed in on the DoubleCqDsSiF"jEx
Double, again from 15x up to 96x, and were all amazed at the symmetryK H+}m!}}!h
of those 4 little stars. A nice arrangement indeed. Next the Ring, and/o#^Vapm"t
a lengthy explanation of what it consists of, at least to the best of my[5pqZ.c;m*j
meager knowledge. Although it's not a supernova (right?), M57 gave us a
chance to discuss and ponder the origins of the elements here on earth.#Q e-n3E#`"~"OY
+C&nu2r6IM$`
After all that we looked at M11, one of my favorite open clusters. A
chance for a mini bio on Chas. Messier, and a each of of took a guess at:M"iYer{}
the number of stars - 100 was the consensus, a little low, maybe - thenn%GH)tQ.DNm E
a meridian flip. We had to realign, as I predicted, and tried alpha
Aquila. (Thanks, here, to the Constellation Tour function; I didn't
have to remember the common, or Proper, name - and I don't remember itkFMZ-xqC#q
right now either. But, you know the one.) Anyway, one of my sons went
back inside, so it was just two of us left, and one of us was gettingKu3g4qy
sleepy. We quickly moved on to M2 and M15, and bored in up to 68x. The\&VA$O_\f$cAvYC
views were superb, the best I have ever seen from my driveway. Nice
objects to contrast with M11. Then we checked out M27. My son said it
didn't look like his brother (Dumbbell, get it?) and said he would go#D3\zh&k5I/w
inside and get him so he could make sure. I said, no that's OK, we can
pack it up and go in soon. So we checked Jupiter again - it had movede y;VZ\1I*fo
quite a bit by that time, which brought home the movement of thenI:|`!VLgd;|-X
celestial sphere. One last trick: I unplugged the power to the GTOB.\2r T3\ Oy.g
400, and watched as my son watched the sky rotating through his field of
view.
4KcdjDm#bCX
Then we did go in. My son had one last question about the scope,
though. Kids are cute, and they say the darndest thing at all ages. He
wanted to know if he could have the 130 GT after I die. I told him we7lI8Rc l `
could decide for sure later. It would depend on his interest level and&R&ja7Pg
grades in the coming years.zJ/l*ds{ j-OO

Thanks to Roland Christen, and everyone else at AP. Y'all make a darn
good telescope, and a nice mount. Thanks for answering my severalN:itY/S}A M7H
questions over the past few weeks. I'll have a few more, I'm sure.w8I(Y.S%yl
5[I)H\F$A8{
Best regards,+I \#j ryA,f&rK
Chuck Hancock
McDonough, Ga

redfox_pd 2008-9-8 14:42

没图？bbbb30

siqingtan 2008-9-8 15:33

Jay Reynolds Freeman还有不少不错的文章3hCw z(hx']#}
1.如何目视深空/m/M tqB
[url=http://www.observers.org/beginner/deep.sky.html]http://www.observers.org/beginner/deep.sky.html[/url]-\:M;`lt3Z?)@Ja
2.器材选购的一些专业术语和词汇T8gy5O^E8@oP
[url=http://observers.org/beginner/glossary.html]http://observers.org/beginner/glossary.html[/url]
3.关于天文目镜
[url=http://observers.org/beginner/eyepieces.freeman.html]http://observers.org/beginner/eyepieces.freeman.html[/url]8x&?qFq)M5d F-{
4.如何尽快发现深空天体3bZwbY Ie:]\
[url=http://observers.org/beginner/starhopping.html]http://observers.org/beginner/starhopping.html[/url]Rb|f?;o+S{Of
5.如何选购天文双筒
[url=http://observers.org/beginner/j.r.f.binocular.html]http://observers.org/beginner/j.r.f.binocular.html[/url]
6.天文爱好者如何起步?
[url=http://observers.org/beginner/j.r.f.binocular.html]http://observers.org/beginner/j.r.f.binocular.html[/url]8eC|ZG,@+s
w nlnk
更多
[url=http://www.observers.org/beginner/]http://www.observers.org/beginner/[/url]a;VA-il,bE
[url=http://www.cloudynights.com/byauthor.php?author_id=291]http://www.cloudynights.com/byauthor.php?author_id=291[/url]2Rq6_1lZ9KyHG WP

Jay Reynolds Freeman天文主页:
[url=http://web.mac.com/jay_reynolds_freeman/]http://web.mac.com/jay_reynolds_freeman/[/url]

siqingtan 2008-9-10 20:29

[quote]原帖由 [i]redfox_pd[/i] 于 2008-9-8 14:42 发表 [url=http://www.astroview.com.cn/redirect.php?goto=findpost&pid=70699&ptid=7046][img]http://www.astroview.com.cn/images/common/back.gif[/img][/url]q*mAQ$WqR$FH
没图？bbbb30 [/quote]
看到有人新贴的一张图片
比TEC140小很多bbbb6
[attach]13526[/attach]

Alone狼 2008-9-23 12:38

嘿嘿看了看不错 :lol

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Jay Reynolds Freeman 对AP 'Gran Turismo'感受