比利时的LDN1251
你好! 再次来自比利时的问候!这是我最近的照片: LDN1251
这是链接到技术细节
谢谢!
Great work! It's me, you know :) Perfect! well done! oldmiow 发表于 2018-7-21 05:44
Great work! It's me, you know :)
猫大好(乱取名字会不会被打(逃
现在在线的是不是都是时差党。。
谢谢楼主分享!16寸 f/4的镜子真的很惊人。从参数和衍射条纹来看我猜这是个牛反。大焦比的牛反的光轴调整尤其重要。看你的图像非常锐利,想请教一下你是怎么调整光轴的呢?从边缘的星点看,我猜测也用了MPCC?(虽然参数网页上没有提到) 本帖最后由 oldmiow 于 2018-7-21 06:47 编辑
grapeot 发表于 2018-7-21 06:37
谢谢楼主分享!16寸 f/4的镜子真的很惊人。从参数和衍射条纹来看我猜这是个牛反。大焦比的牛反的光轴调整尤 ...
是牛反沒錯,但是這不是一般國內這種牛反,這種大砲的工藝和穩定性一般不需要使用者大費周章搞的,裏頭配了四英吋的coma corrector
http://www.dreamscopes.com/pages/07/16inDAtube-01.htm
grapeot 发表于 2018-7-21 06:31
猫大好(乱取名字会不会被打(逃
现在在线的是不是都是时差党。。
who are you?
grapeot 发表于 2018-7-20 23:37
谢谢楼主分享!16寸 f/4的镜子真的很惊人。从参数和衍射条纹来看我猜这是个牛反。大焦比的牛反的光轴调整尤 ...
那是对的。 我使用4英寸Wynne Coma Corrector
biedie 发表于 2018-7-21 06:50
那是对的。 我使用4英寸Wynne Coma Corrector
Very great High-End Newtonian Coma Corrector with60mm diameter flat field circle!
What a masterpiece lens!
oldmiow 发表于 2018-7-21 06:46
是牛反沒錯,但是這不是一般國內這種牛反,這種大砲的工藝和穩定性一般不需要使用者大費周章搞的,裏頭配 ...
感谢。我也搜到这个页面了哈哈。的确温度变动的时候对焦仍能得以保持是非常牛的。但我对光轴还是有点疑问。。也许只是因为贫穷限制了我的想象力{:5_286:}
biedie 发表于 2018-7-21 06:50
那是对的。 我使用4英寸Wynne Coma Corrector
谢谢!4英寸的coma corrector简直可怕。。涨见识了。。我猜这个望远镜的成像圈(imaging circle)也很大?我还是惊叹于这个图像的锐度,这么大(焦距相应也长),这么快,光学素质还能这么好;几个小时的总曝光时间,跟踪和导星也能做到完美。且不说经济实力,这技术也太好了。要能分享一下经验就太好了 (English is fine. I can try to translate to benefit the community)。
好器材加之好的后期处理,赞 恭喜您的国家拿到季军! gequnhua 发表于 2018-7-21 02:46
恭喜您的国家拿到季军!
谢谢 {:5_283:}
grapeot 发表于 2018-7-21 01:41
谢谢!4英寸的coma corrector简直可怕。。涨见识了。。我猜这个望远镜的成像圈(imaging circle)也很大? ...
谢谢。 我学习了一点中文,但还不足以解释技术细节 {:5_283:}
I've spent some time to find a good combination of camera and telescope. The 16" f3.75 telescope has a focal length of 1500mm. De camera, FLI16803, has a big sensor of 36x36mm and pixel size is 9µm (4096x4096 pixels). This combination results in a resolution of 1.234" which corresponds with good seeing conditions. Because of the large square sensor, the FOV is 1.4°x1.4°
The mount is ASA DDM85. This is a direct drive mount and brings periodic error close to zero (no gear related mechanical imperfections). I use this mount unguided and the stars are still nice round after 300s. Exposures of 300s is sufficient with this fast system. The tube is made of special grade carbon fibre and I've seen no change in focus within a temperature range of 10°C (even at f3.75)
I hope this answers some of your questions.
令人惊叹的图像! grapeot 发表于 2018-7-21 08:41
谢谢!4英寸的coma corrector简直可怕。。涨见识了。。我猜这个望远镜的成像圈(imaging circle)也很大? ...
ASA的赤道仪,不需要导星 SOBER2017 发表于 2018-7-22 20:59
ASA的赤道仪,不需要导星
扫噶~我在一些高端望远镜出租/共享网站上也看到了ASA赤道仪,原来精度这么高~
grapeot 发表于 2018-7-21 01:41
谢谢!4英寸的coma corrector简直可怕。。涨见识了。。我猜这个望远镜的成像圈(imaging circle)也很大? ...
I tried to reply to yor questions but for some reason it got not approved by the forum moderator :-(
biedie 发表于 2018-7-23 06:04
I tried to reply to yor questions but for some reason it got not approved by the forum moderator : ...
Eh... Sorry to hear that... I guess that (requiring moderation) happens when you include links in the post. An alternative may be, you can PM me the post and I can then post out the translated version for you, assuming I can get around the moderation somehow...
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