Here is the place to talk about all those equipment(Telescope, Mounts, Eyepieces, etc...) you have. Not sure which scope/eyepiece is best for you? Trash it out here!
weixing wrote:Hi,
Oh Sh*t... can feel your pain by just reading it... Very sad, but that's the risk when buy directly from oversea...
Anyway, I think some of the scope expert here might be able to help you with it. It's a waste to let 5" of triplet ED glasses to collect dust.
Have a nice day.
I checked his scope already. He contacted me because he saw I have the same scope.
The collimation was way too off. Shimming can't do much. I think the lens itself is not aligned properly within the cell. Probably the cell wasn't machined to the best tolerance. The only way to salvage this is maybe to machine another lens cell.
I have already warned people of buying direct from China. Either you get your goods in bad shape or sometimes you don't even get it at all. These days I get my staff (when they go BeiJing on business) to hand carry certain goods from my HQ rather than shipping it in. Too much hassle. Just not worth the time and effort.
Don't always look at price. Check the credibility of the vendor and most important, get it safe! Buy it from someone you can trust. Sometimes I rather pay more to get it from US than all the dubious sources.
Arief, you should keep the scope, it is very portable ( that is the best part of it ) and you can see Lui Ming's best effort radiating form that scope.
btw, how is lui ming's tmb 152 coming along ? ....
weixing wrote:Hi,
Oh Sh*t... can feel your pain by just reading it... Very sad, but that's the risk when buy directly from oversea...
Anyway, I think some of the scope expert here might be able to help you with it. It's a waste to let 5" of triplet ED glasses to collect dust.
Have a nice day.
I checked his scope already. He contacted me because he saw I have the same scope.
The collimation was way too off. Shimming can't do much. I think the lens itself is not aligned properly within the cell. Probably the cell wasn't machined to the best tolerance. The only way to salvage this is maybe to machine another lens cell.
I have already warned people of buying direct from China. Either you get your goods in bad shape or sometimes you don't even get it at all. These days I get my staff (when they go BeiJing on business) to hand carry certain goods from my HQ rather than shipping it in. Too much hassle. Just not worth the time and effort.
Don't always look at price. Check the credibility of the vendor and most important, get it safe! Buy it from someone you can trust. Sometimes I rather pay more to get it from US than all the dubious sources.
Our Australian counterparts in ICEINSPACE definitely have a better shipping experience for their 127ed....It looked well packed in double boxes and individual bubble pack within.
i think you need to pay for insurance, they will be more careful with your parcel and buy from reputable shops from China...
The lens cells could also be different, as the US astrotech 127ed uses Ohara glass and the China direct export uses Chinese Glass? i have no basis to say it, but that is my assumption.
Vincent, you have seen both apo's are the lens cell the same?
weixing wrote:Hi,
Oh Sh*t... can feel your pain by just reading it... Very sad, but that's the risk when buy directly from oversea...
Anyway, I think some of the scope expert here might be able to help you with it. It's a waste to let 5" of triplet ED glasses to collect dust.
Have a nice day.
I checked his scope already. He contacted me because he saw I have the same scope.
The collimation was way too off. Shimming can't do much. I think the lens itself is not aligned properly within the cell. Probably the cell wasn't machined to the best tolerance. The only way to salvage this is maybe to machine another lens cell.
I have already warned people of buying direct from China. Either you get your goods in bad shape or sometimes you don't even get it at all. These days I get my staff (when they go BeiJing on business) to hand carry certain goods from my HQ rather than shipping it in. Too much hassle. Just not worth the time and effort.
Don't always look at price. Check the credibility of the vendor and most important, get it safe! Buy it from someone you can trust. Sometimes I rather pay more to get it from US than all the dubious sources.
Our Australian counterparts in ICEINSPACE definitely have a better shipping experience for their 127ed....It looked well packed in double boxes and individual bubble pack within.
i think you need to pay for insurance, they will be more careful with your parcel and buy from reputable shops from China...
The lens cells could also be different, as the US astrotech 127ed uses Ohara glass and the China direct export uses Chinese Glass? i have no basis to say it, but that is my assumption.
Vincent, you have seen both apo's are the lens cell the same?
Both are exactly the same. All these APO triplets has a FPL-51 lens in them regardless whether they are AstroTech, Meade, Maxvision, etc
Hi Vincent, from your experience, are the individual glasses all made in China, or some of them are actually From Japan, and they assembled and cement them in China, i undertand that in the 127ed Triplet, only one element is SD ( which is either china made or Japan like Ohara, or like tmb they even use Schott glass from Germany etc while the rest of the 2 are ground glasses. any lens engineer here care to share?
Last edited by wucheeyiun on Fri Jul 25, 2008 10:31 am, edited 1 time in total.
wucheeyiun wrote:Hi Vincent, from your experience, are the individual glasses all made in China, or some of them are actually From Japan, and they assemble and cement them in China, i undertand that in the 127ed Triplet, only one element is SD ( which is either china made or Japan like Ohara, or like tmb they even use Schott glass from Germany etc while the rest of the 2 are ground glasses. any lens engineer here care to share?
The FPL-51 element should be from Ohara. Regardless where they are from, the image through the eyepiece is excellent.
wucheeyiun wrote:Hi Vincent, from your experience, are the individual glasses all made in China, or some of them are actually From Japan, and they assembled and cement them in China, i undertand that in the 127ed Triplet, only one element is SD ( which is either china made or Japan like Ohara, or like tmb they even use Schott glass from Germany etc while the rest of the 2 are ground glasses. any lens engineer here care to share?
There are many different glass companies. There are also china produced glasses. China optics manufacturing can manufacture optics with Schott glass/ Ohara glass etc. Glass is just the material. How well the manufacture depends on the optics production and how well the scope performs depends on the design and manufacturing tolerances. One pays more for better tolerances..and ultimately better performance.
I think many people think that just because the glass used is Schott..they think the lens is manufactured in Germany..which is not true.
can feel your pain by just reading it...
Very sad, but that's the risk when buy directly from oversea...
