SPI­DER VANE

Sky at Night Magazine - - FIRST LIGHT -

FE­BRU­ARY The ro­bust de­sign elim­i­nates the need for con­stant col­li­ma­tion, hold­ing the sec­ondary mir­ror steady in all po­si­tions. As one of the trick­i­est aspects of us­ing fast New­to­ni­ans, we didn’t miss fid­dling about with screw­drivers dan­gled over ex­pen­sive mir­rors in the dark.

we came out of th­ese vis­ual tests with high ex­pec­ta­tions for the tele­scope when used for as­tropho­tog­ra­phy, and we were not dis­ap­pointed.

Us­ing a DSLR and Bahti­nov mask, we found fo­cus to be sharp across the whole field. The cor­rec­tor main­tains good colour across the red, green and blue wave­lengths, mean­ing that when used with a DSLR or colour CCD, you won’t have the is­sue of bloated blue stars. In fact the im­ages pro­duced from the R200SS and Cor­rec­tor PH in com­bi­na­tion were very good in­deed, with sharp, nicely shaped stars even at the edges of the frame.

Fast scopes have a tiny depth of fo­cus, and there­fore re­quire pre­cise fo­cus­ing. The dual-speed rack and pin­ion fo­cuser sup­plied, whilst not silky smooth, felt firm and de­pend­able, and more than ca­pa­ble of al­low­ing the minis­cule move­ments nec­es­sary. As the out­side tem­per­a­ture dropped, the fo­cus re­quired tweak­ing, but that, re­mark­ably for an f/3.8 New­to­nian, was all the ad­just­ment needed to achieve great qual­ity im­ages, even af­ter sev­eral weeks of use.

Per­haps the ul­ti­mate com­pli­ment for a re­flect­ing tele­scope would be that is as easy to use as a re­frac­tor. With the R200SS and Cor­rec­tor PH com­bi­na­tion, Vixen is very close in­deed to that stan­dard and has made it eas­ier than ever to take high qual­ity astro im­ages in a short time.

Part of IC 1805 – a to­tal of three hours and 20 min­utes with a mono­chrome CCD

M45 – 45 min­utes with a colour CCD

Newspapers in English

Newspapers from UK

© PressReader. All rights reserved.