[ATM] L-H telescope under construction

["Ukyo Chen" <ukyochen888@hotmail.com>]

Hi all,

I had ordered 1 set of 127mm diameter L-H lenses and now they are under 
construction in a Chinese optical company.

I supposed to order 10 sets together with some ATMers but now I do think I 
should take the risk  and make a real one first due to somebody do not trust 
sth on the internet. The price is double for one set compares with one in 10 
sets.   -_-!

I use OSLO/Zemax software to get the best system parameters. It is a F/5 
design and 20% diameter obstruction both suitable for visual and photograph. 
BFL is 51mm which is okay for any SLR/DSLR.

I will try to use an unique tube design. Fix the mirror in 1 tube and the 
corrector in another tube and connect them by screw, seperate them and put 1 
into another for compacted size when carry out. So no hours needed for cold 
the air in the tube. Try to use Mg-Al alloy tube if possible as it is very 
light.

I read some mails talking about blank glass price in US and think it is 
really expensive and so they hardly can make a L-H by themselves. With that 
price I can buy a whole set of polished lenses in China. The problem in 
China is seldom people like astronomy but not the money.

Best Regards,
Ukyo Chen


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