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2SKY

24 Ian 2018 02:48



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Ce zic astia mai de la sat ....

Thus, it remains in its geometric form even during the cooling time, and this is the difference to a reflector made of BK7 glass. Because of this, the mirror provides a better reproduction efficiency in the cooling down phase. Moreover, Pyrex can be parabolised much easier. However, this mirror doesn´t cool down in a shorter period of time than other mirror products. 

Si in plus ating mai usor sist limitari la difractie . 
http://skywatcher.com/product/bk-p2501200-otaw/