【目视派极品】口径60厘米-1米反射望远镜 之一
本帖最后由 sxtw8 于 2015-10-24 21:11 编辑本人是一个目视派，因为目视身临其境的感觉，是看照片所无法比拟的。初中刚喜欢天文那时候，经常会画很多个圆形，看实际口径有多大。也增写成表格，排列出各个口径集光力的大小。经过多方面比较，对于目视深空，口径和价格来说，DOB和反射镜最具有性价比。 今年喜欢收集一些大口径DOB反射镜厂商，希望自己有一天可以拥有。
我近期会陆续发一些我收集的信息，和大家一起交流分享。哎，对于我这个英语不好的人来说，找这些真的是不容易。
在此有个问题，如果想买这些国外的望远镜，运费是不是超级惊人，会收关税等等费用吗？还是找国内厂家给代购还是自己和厂商联系呢。有国外购镜经历的可以说一说哈。
这个厂商提供60厘米-1米的反射望远镜，下面这个照片是口径75厘米的，价格：$84,950 接近54万人民币
参数：NTT-30 Product Information
Features
Open truss NewtonianFolded optics for more convenient eyepiece heightAlt-azimuth mountCompact sizeFast assembly18-point Roller-Edge mirror cellStellar Cat and Argo Navis Computer Systems for "Go-To" computer controlBattery and AC operationAdjustable focal pointMassive 2" declination ball bearings28" Drive Gears and Clutches on both axesJMI's celebrated quality construction
Specifications
Type:Folded Newtonian ReflectorMount:Alt-azimuthMirror:30" f/4.2 primary, 11.5" flat secondary, 5.5" enhanced diagonal tertiaryPower:12vDC operation with 17 amp-hr gel-cell batteries or adapterWeight:approximately 350? lb.Height:99" assembled, Eyepiece height 72" at ZenithWidth:43"Depth:35"Finder:9x50 straight through and a Telrad
Standard Equipment
JMI Focuser with Motor for motorized focusing.Extension Tube for 2" Focuser.22mm 2" Panoptic Eyepiece.9x50 Finder Scope (straight-through) with dovetail mount.Telrad Finder ScopeSerrurier Truss Rods.Adjustable Focal Point including two different nose assembly mounting positions for visual and photographic work.Sliding Counterweights positioned along the truss rods for fine tuning the balance (4).Alt-Azimuth Drive with 18" gears.27-Point Flotation Mirror Cell.30" Mirror.A precision annealed 2" thick Pyrex diffraction-limited primary mirror.Primary Mirror Dust Cover.Stellar Cat and Argo Navis Computer Systems for "Go-To" computer control.Battery or AC Power with 12vDC 17 amp-hr rechargeable gel-cell batteries, 12vDC cigarette lighter adapter and 110vAC/60Hz or 220vAC/50Hz (specify) wall transformer.
* Telescope prices are for the standard telescope configuration.Upgrades and Options are at additional cost.The listed price also does not include the crating charge ($500) and any shipping and handling charges.Please call for a shipping quote.A 10% DEPOSIT is required with all telescope orders (5% IS NON-REFUNDABLE).Telescopes are custom-built based on the options selected by the customer and therefore require time to build.The remaining amount due must be paid before the telescope is shipped.
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下面这个是口径1米的。价格他们写的是需要自己询价
.。
参数：40" NTT Telescope
NTT-4040" Alt-AzimuthFolded NewtonianMounted on a Trailer
NTT40$CALLCall for Price*NTT-40 Product Information
Features
Open truss NewtonianFolded optics for more convenient eyepiece heightAlt-azimuth mountCompact sizeTrailer mounted27-point Roller-Edge mirror cellGoTo Computer (call for current info)Battery and AC operationAdjustable focal pointMassive 2" declination ball bearings28" Drive Gears and Clutches on both axesJMI's celebrated quality construction
Specifications
Type:Folded Newtonian ReflectorMirrors:40" f/4 primary, 14.5" flat secondary, 7" (minor axis) diagonal tertiaryPower:12v DC, 500 mA operation with 17 amp-hr gel-cell batteries or adapterWeight:approximately 2500 lb.Height:11' at ZenithEyepiece Height:7' (Zenith) to 60" (Horizontal)Width:Fork 46"Finder:9x50 (or larger) straight through and a Telrad
Standard Equipment
JMI EV-XT Focuser with Motor for motorized focusingExtension Tube for 3" Focuser22mm 2" Panoptic Eyepiece9x50 (or larger) Finder Scope (straight-through) with dovetail mountTelrad Finder ScopeSerrurier Truss RodsAdjustable Focal Point.A movable folding flat gives a wide range of back focus adjustment.One inch of movement of the secondary flat gives two inches of movement in the focal plane.Removable Counterweights attach to the tub or nose assembly for fine tuning the balance (6)Alt-Azimuth Drive with 28" gears27-Point Roller-Edge Mirror Cell40" Sital MirrorPrimary Mirror Dust CoverGoTo Computer (call for current info)Battery or AC Power with 12vDC 17 amp-hr rechargeable gel-cell batteries and 110vAC/60Hz or 220vAC/50Hz (specify) wall transformer
* Telescope prices are for the standard telescope configuration.Upgrades and Options are at additional cost.The listed price also does not include any delivery charges (crating and shipping and handling).Please call for a delivery quote.A 50% NON-REFUNDABLE DEPOSIT is required when ordering this telescope.Telescopes are custom-built based on the options selected by the customer and therefore require time to build.The remaining amount due must be paid before the telescope is shipped.
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下面这张，女的身后这个估计也是75厘米，这是不是还带赤道仪，摄影会不会就没有场旋了？那样就可以兼具目视和摄影了。
太高大上了…信达16寸足已。 本帖最后由 卡卡罗特 于 2015-10-25 00:56 编辑
一旦拥有，别无他求。 想在中国城市用这玩意儿，第二天就会出现在城管大队的停车棚里。 副镜这样的反射角度会影响光学吗？ 巨炮啊 这个得准备拖车才能搬走 超级目视极品，中国还是有支持的环境的，LZ有这些品牌的链接吗？ 如果我没记错的话，一辆轿车从美国运到中国也就是2000多美金，不到3000 OBS 18寸， 国际运费大约8000-9000，税费17%+3%。仅供参考~ 最後一張的是馬蹄式赤道儀～美國帕洛馬山上的5米望遠鏡就是這個款式的馬蹄式赤道儀～追蹤無難度～
不带自适应光学系统的话，超过40cm就没有意义了。看什么都是抖的。而且美国的东西偏贵，当年做一套420带赤道仪、圆顶也不过二十多万。 terryljh 发表于 2015-10-24 23:36
很不错的东西
1米。。当然不错啦。。。
夜星河 发表于 2015-10-24 21:29
太高大上了…信达16寸足已。
嗯，16寸也很大了
kukutf 发表于 2015-10-24 23:17
这个得准备拖车才能搬走
这个望远镜有很多配件可选，有后挂的小平板。 可以用车托着走。我找了图片你看下。
http://www.jimsmobile.com/images/ntt40d.jpg
tengyusz 发表于 2015-10-24 23:19
超级目视极品，中国还是有支持的环境的，LZ有这些品牌的链接吗？
目视派爱好者的共同梦想。以上都是一个品牌的镜子，这是官网http://www.jimsmobile.com/。以后我会陆续发一些自己整理的其他品牌大镜子。
wlbx 发表于 2015-10-25 07:51
不带自适应光学系统的话，超过40cm就没有意义了。看什么都是抖的。而且美国的东西偏贵，当年做一套420带赤 ...
"超过40cm, 看什么都是抖的"，这个尺寸说的是不是有点小了? 我22寸 55.6CM正常300倍内在南方都不觉得抖，今年6月份观测土星600倍清析锐利，800倍都还可以接受的。 laojian 发表于 2015-10-24 22:42
副镜这样的反射角度会影响光学吗？
理论上是不是反射的角度越小损失的灰比较大呢，不懂，就问问~ wlbx 发表于 2015-10-25 07:51
不带自适应光学系统的话，超过40cm就没有意义了。看什么都是抖的。而且美国的东西偏贵，当年做一套420带赤 ...
口径大的望远镜确实有波形变化，但只是表现为所观测的天体有忽大忽小的变化或抖动，但对目视而然完全没有问题，对天体的细节表现完全没影响。专业科研的天文台空装的自适应系统最终目的是为天文摄影的需要，保证拍出的照片不失真。天文台的望远镜那么大口径，一方面是为了分辨率的提高，二是强光力可以极大的缩短曝光时间。而我们好多天体摄影发烧友的望远镜一般都是100mm左右，就是考虑摄影时的大气运动变化，最大程度的保证照片质量。但是曝光时间要延长好多时间。
得有个合理的下半身。这些下半身都不够稳。得换