The F/2 op­tics ad­van­tage

Sky at Night Magazine - - FIRST LIGHT -

The ul­ti­mate ques­tion is whether the RASA de­sign works. Does it de­liver a flat, well-il­lu­mi­nated field and does it de­liver it quickly de­spite the light block­age from an at­tached cam­era? The an­swer is a re­sound­ing yes, it does its job as de­scribed and we can say with con­fi­dence that this is a se­ri­ous con­tender in the field of as­tropho­tog­ra­phy. Stars ap­peared sharp right to the edge of our test frames and we de­tected no anoma­lous is­sues when bright stars were in the field ei­ther. The op­tics are also op­ti­mised to fo­cus across a wave­length range of 390–800 nanome­tres, which is ex­cel­lent. The f/2 sys­tem is im­pres­sive, al­low­ing you to get very deep im­ages quickly. The RASA’s wide-field is per­fect for large deep-sky ob­jects or clus­ters of ob­jects such as gal­ax­ies. Com­bined with the fast op­tics, this is a scope which is very for­giv­ing of track­ing is­sues; a per­fect por­ta­ble scope for deep sky imag­ing. This is echoed by the RASA’s sim­plic­ity – once pointed, tracked and focused, all you need do is sit back, re­lax and watch your masterpiec­e un­fold.

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