原帖由 zzl520 于 2007-10-11 06:55 发表
我对光学了解不多，但是对机械有一点点的了解，既然光学对机械有很大的依赖，我不敢想像如果一个两节配合的光学系统能歪到如此程度还能发出去检测，那厂家恐怕连最基本的机械设备都不具备，更不要说光学技术人才了，就算爱好者个 ...
请大家看看在TOM发表评论后，一个得到过我们旧款80的意大利朋友作的澄清。http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Board/article/Number/1851742/page/0/view/collapsed/sb/5/o/o/fpart/allPilolli
newbie
Reged: 09/02/07
Posts: 1
| Re: CN Report: Protoduction Optics [Re: Mike28]
#1878853 - 10/01/07 06:43 PM | | Edit | Reply | Quote [td] Quick Reply |
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Nice story but, believe it or not, I'm here to help the pirate scope!
I got an intane 80ED scope like the one tested by Tom about nine months ago. I tested it for a while and decided that Cina was the right place for those scopes. I'm italian so, pls, bear with me and my poor english.
I do agree with almost all tom's considerations:
1) the "engineer" designing this tube was on his first day at work, probably.
2) the tube simply got the "wrong lenght" since you can reach focus only with 1,1/4" diagonals or his own 2" prism (included into my package). Too long for 2" mirror diagonals, too short for using an eyepiece without extensions.
3) the dewshield was basically a... well... lightshield suitable for dark places...
4) the focuser isn't exactly brilliant and you can't change it since is embedded into the tube.
Nevertheless, Tom really surprised me when he didn't realize how to lock the tube properly. His experience was obnubilated by the chinese experience.
Jokes apart, I really have great consideration for Tom's proficiencies, that's why I decided to post this. This scope got so many problems, he doesn't need new ones.
After all, I must admit I fell in the same trap as soon as I opened the tube the first time. It was floppy! But I didn't give up.
The right way to lock the tube is to unscrew the silver gear at the end of the blu tube until it leaves enough room for the terminal part of the black tube to get into the slots provided. Then you need to tighen again the silver gear. (I beg your pardon if this part isn't clear enough. I'm not used writing about mechanics in english).
Once the tube has been locked properly, it becomes really solid. I tried to swing it as a baseball bat (ok, not hitting anything, but that's not the point...) and it gave a feeling of sturdyness to me.
I must say that I wouldn't be surprised if the Tom's sample got a faulted locking mechanism.
Of course, I changed the horrible white "holding ring" with two real holding rings mounted onto a dove tail bar.
Now the pirate scope was ready for a real test.
Since I had the possibility to test it for quite a long time, I thought to post my impressions. They are not intented to replace Tom's ones but to give just a confrontation ground if Tom would ever decide to give the pirate scope a second chance (that anyway wouldn't reveal any breath taking surprise , at least into my opinion).
As Tom said, the color correction is fair. Nevertheless, a violett fring is clearly visible in long exposure photos aroung the brightest (and also around the not so bright) stars. It isn't an horrible amount of color, but it's definitely more present than in the Orion 80ED doublet and need some photoshop work to disappear (or a filter during the shooting).
The field curvature correction is better than in the Orion 80ED doublet. I use this scope as a reference since I think is quite well known. Anyhow, it's still far from the flat field offered by the Pentax 75SHDF or the Vixen 140N (just to make to example of what I think a flat field is).
I'm not able to certify it, since I don't own a ronchi reticule, but I'm almost sure that the optics of the Intane's Pirate Scope suffer from some spherical aberration. I saw no trace of astigmatism and the optics were perfectly centered. The star test was really good on this side.
Just a quick note to say that I didn't need to use the collimation screws on the front cell. Collimation resisted the travel from China to Italy.
So... Why did I decide to introduce myself into the Cloudy Night community criticizing the work of a valid members of its?
Also if I do understand that's not the most pleasant way to introduce myself, I love the work of the CN community and I want to contribute to make it even better. Please, understand that it isn't my meaning to criticize anyone but just to contribute to give the precise infos that CN always give. I'm sure that my post is far from being perfect and I would like to hear from Tom or anyone else who tested the intane to have a second "opinion" to compare to.
I'm closing my (too long) post with some "follow up" from Intane.
Since I complained about the quality of the scope, they kept me updated about their development. This prototype never went into production run. They just started production of another scope, same optics (they said, but I can't be sure) but different ota, very similar to the united ones. Intane Optics aren't distributed in Italy but an Italian reseller (a friend) just asked for a sample of the new scopes (he wanted to give them a second chance also being aware of the first disaster) for evaluation.
I'm not very good at astrophotos, but I got some shots I can post if anyone wants to take a look at field and color correction.
Thanks for the time you guys spent to read my lines.
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Tom Trusock
Reged: 02/26/02
Posts: 20444
Loc: Are we there yet? | Re: CN Report: Protoduction Optics [Re: Pilolli]
#1878911 - 10/01/07 06:58 PM | | Edit | Reply | Quote [td] Quick Reply |
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Quote:
The right way to lock the tube is to unscrew the silver gear at the end of the blu tube until it leaves enough room for the terminal part of the black tube to get into the slots provided. Then you need to tighen again the silver gear. (I beg your pardon if this part isn't clear enough. I'm not used writing about mechanics in english).
Once the tube has been locked properly, it becomes really solid. I tried to swing it as a baseball bat (ok, not hitting anything, but that's not the point...) and it gave a feeling of sturdyness to me.
I must say that I wouldn't be surprised if the Tom's sample got a faulted locking mechanism.
Thanks, I'll have to take a closer look at that. (No instructions included with this one I'm afraid, I was totally on my own.)
I'm very glad they decided to change the OTA.
And thanks for the "second opinion", it's appreciated!
Tom T.
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The Out Back Observatory
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看来昨天我的猜测，TOM拿到的样品有损毁可能不太正确。很可能是TOM本人没有把我们伸缩式镜筒旋转到位，没有把定位系统固定好导致了镜筒和露罩不在一条轴线上。如果固定好，应该是不存在这个问题的，应该是很牢靠的。因此，TOM后来表示要对我们的旧款样品作重新审视。
此外，我还想呼吁一种“百家争鸣，百花齐放”的宽松论坛氛围。记得小时候读过一篇课文，大意是爱因斯坦小时候做的小凳子被老师批评，他平静地拿出了一些更差的小凳子，告诉老师那些是更早的时候做的，更丑陋。我想，任何一个人、一个产品、一个公司，都有不断学习、发展、进步、积累的过程，我们要宽容一些错误，支持一些努力，这样才会在我们当今社会造就更多的成功创业者，才会有更多的中国自主创新、自主知识产权的产品在世界上为中国争光，谢谢！
[ 本帖最后由 intane 于 2007-10-11 09:47 编辑 ] |
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