本帖最后由 mandii 于 2011-1-20 12:26 编辑
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Uncle Peter : Today, 03:23 AM from Toronto, Ontario
Mandii,
That's one great observatory that you've built! Just from one look, you can tell that that thing is solid. It's great that you posted your progress on it here, as well as pictures; they are very inspiring for other people.
You have some really great moon photos, too. I am trying to get into astro-photography, and have started on the moon, identifying a few of it's seas and craters along the way.
One question though, does your observatory help to decrease light pollution?
I can't wait to see more of your photos.
Clear Skies,
Uncle Peter
MANDII : Today, 09:10 AM
Thanks Uncle Peter‘s comment ,
You mean how the observatory can be hided from some of the outside light source ?
Or how the light pollution come from the sky , can be reduced it's impact in taking the images ?
For the first question , the dome halves can sheild away from much of the outside light sources already .
At least halfly ( 180 degree) light is avoided . Sometimes I even open the dome much less , with a little hole only, that can let me still enough to observe the object . Normally I kept very dark inside the dome( no lamp , PC monitor turns off , use red light star chat etc...) , during observation time .
If you are asking the 2nd question , I think you know that most people would choose to use some kind of imaging filters , to get rid of light pollution . However , for the moment , I didn't use filter yet .
Hope this answer are helpful . . .
这也太厉害了吧，太强了
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谢谢 ::42::
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本帖最后由 mandii 于 2011-2-23 09:37 编辑
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去年6月8日买回来的ORION 6" F5 牛反,当时考虑到原来那部牛反要拍再多些深空，计划是大半年后使用,
今天突然想换,便做了个连接部位,把它安装好，正式启用。
这是我的第二部天文望远镜,很可能会是最后一部,我希望会一直够我用下去。
MANDII
年初三（2011）
用那个双筒镜的时候，空间是不是有点小啊？！::070821_13.jpg::
用那个双筒镜的时候，空间是不是有点小啊？！
louww 发表于 2011-2-5 20:30 http://www.astronomy.com.cn/bbs/images/common/back.gif
双筒镜最近才重新开始用,偶尔看看，还行吧空间,用单筒拍摄时把双筒放一边，坐在里面看双筒挺舒适的感觉。
US ASTRONOMY
samgray1 : Yesterday, 12:03 AM from San Diego, Calif., USA
It looks good Mandii.
Uncle Peter Yesterday, 01:34 AM from Toronto, Ontario
Nice set-up Mandii and great shot of M50.
What kind of mount are you using for your 6" Orion? It looks like an EQ mount, but I'm not sure which one it is.
MANDII : Today, 09:47 AM
Yes, it's the "智通"EQ3 made in China ,with one motor , no goto and guiding .
A new one is selling several hundreds Hong Kong Dollars in the market .
It carry up around 10KG things on a normal star tracking , I think .
I had used it nearly 1 year with my 4" Newtonian without complaint on it's perfomance in such good price .And now , it's going on the tough hunting task with this newly installed 6" newtonian .
So far so good , within my estimation when I decided to bring it home last year .
US ASTRONOMY
sxinias : Today, 12:23 PM from Sxinias Marathon Greece
Mandii,
Congratulations on getting your 6 inch telescope in operation. You are doing some good work without sophisicated equipment. Have you had the opportunity to accurately polar align your mount?
Joe
MANDII : Today, 02:56 PM
Dear JOE ,
The day of 5th Feb , I setup this scope .
On the same night , I did polar alighment by Drifting method , and took the picture of M50 & NGC3242 .
Polar alighment is always important . In my situation , it helps me to find the object efficiently ,accuratly ,and helps to track the object during the imaging process . To explain this two points indepth , it can be too much to say .
For this time , I want to say something about how I do the polar aligment , find the object , and track the object into pictures . It's my first time to explain this in this forunm , in English .
I did the drifting not by naked eye with eyepieces .It's done on a computer screen by inserting the camera(DSI-I) . The EQ3 mount is turned the polar at the same time when I look at the star moving-discrepancy from the screen . The more exposure time taken in a single flame , the more discrepancy( star tails) we can see from the screen . And then adjust(polar align ) the mount to reduce the discrepancy .
2ndly , if the mount is not aligned well , I can't find the DSO objects properly .
Actually , I am not free-finding the objects , like the star-hooking inside the eyepiece .
Becasue star-hooking is difficlut in my case , there is not much stars in the View finder. The FOV in an eyepiece(25mm eyepiece ) is so small( less than 1 degree) , and the star positions is always rotated to some degrees in a Newtonian scope , it's not fully inverted as the normal refractors do . So you cannot easily recognise those stars in a mean time , when you are looking at the the star-chat at the same timming. In summary speaking , It's very hard to find the object .
Indeed , I was usually using the numeric calibration ( RA and DEC scales ) on the mount . I turns the RA axis according to the time angle of an object ,meaning the RA value the object is located at the time it is observed . Let say this moment the object is located at time-angle 22h10m , the next hour it will move to position 23h10m . The time angle is very looks like to the RA value of an object , but it's changing with time and RA is fixed . After the mount's RA axis is rotated well , I turns the DEC axis to the DEC value of that object , this is traight forward because the DEC of an object is always fixed whenever any time is concerned .
THE ABOVE METHOD TO FIND AN OBJECT , I PERSONALLY CALLED THE " MANUAL GOTO" , it's similar to electronic GOTO , but using your own hand . If the mount is not aligned well, I can't see the objects within the FOV . This time , I can see the M50 and NGC3242 within the eyepiece FOV , by just one time turning of the RA and DEC aixs . It's located not really at centre , but within the area of the FOV .
3rdly , the polar alignment is aimed to star tracking in imaging .
My tracking this time was 1 minute single exposure , for total 10-20 minutes .
BR
MANDII
資金啊。。。只能等將來了
本帖最后由 mandii 于 2011-2-7 16:18 编辑
年初三当晚拍的,赶新年新镜开光日 !
谢谢大家观看::hairsmile::
US ASTRONOMY
dmbryan : Yesterday, 11:56 PM from b'ham alabama
Looks like a nice setup there. Congratulations.
Lenbo : Today, 01:05 AM from Cochranville Pa.
Looking good MANDII. Great use of your available resources. You've come a long way.
PBalu : Today, 01:14 AM from Bloomington, Indiana
Nice work Mandii. I like your observatory too.
村屋就是好啊。以前在大埔住的时候那个天，随便一看就是一大堆星星啊~ 羡慕一下楼主的天文台~ ::070821_04.jpg::
村屋就是好啊。以前在大埔住的时候那个天，随便一看就是一大堆星星啊~ 羡慕一下楼主的天文台~ ::070821_04. ...
sunyuanzhen 发表于 2011-2-10 11:59 http://www.astronomy.com.cn/bbs/images/common/back.gif
原来系自己友 , 多谢 !
新年快乐::070821_09.jpg::::hairsmile::
US ASTRONOMY
Uncle Peter : Yesterday, 10:42 PM from Toronto, Ontario
Ah I see, thanks Mandii!
当年鬼子打过来的时候 要是家家有这个 抗日战争还能提前4年结束哦
今日下雨天,在天文台里自制双筒支架,使原来的10X50双筒可与目前6"ORION牛反合拼用，
而不用分开用另一个相机脚架 。这样做主要是为了能节省空间以利双筒目视观察。
我以前很喜欢用双筒看星的，一直都想在现有的望远镜里加双筒。
把双筒接到赤道仪上，和牛反平行，会有好多好处，能看能拍能方便寻星（正像），比寻星镜还好用。
接个目镜后拍摄用万能架和数码相机便可拍摄了。加上赤道仪的电跟，有利长时间爆光拍摄。
而且用了T型架，双筒可以相应旋转视野(图DSC00143)，使观察者的头不用倾侧来看。
我今天试了观看各个不同部位的经筒指向了，感觉不错，舒适。
10X50双筒（10X）的视角是6度“正像”，750mm牛反用25mm目镜（30X）的视角是1度多左右“倾侧像”。
6X30寻星镜的视角最大，有差不多9度“正倒像”。
2011/02/13
MANDII
在HK 在这个小屋子里 很热阿!
本帖最后由 mandii 于 2011-2-13 22:12 编辑
在HK 在这个小屋子里 很热阿!
mfx 发表于 2011-2-13 18:51 http://www.astronomy.com.cn/bbs/images/common/back.gif
不热,你如果有追我之前贴上写的报告就知道了。
砖墙涂了特制的隔热防晒涂料的，一年会感觉热的天时也就7月和8月倆个月，
有几次下午35度时都试过了，里面还阴阴凉凉的。
隔热本来就是这工程的主要目标，因为我白天还要用的，上网打游戏什么的。不只晚上看星。你要是有看我山上树木拍摄照片，在另一张贴里，很多都是白天或夏天午后进行的。