The F/2 optics advantage
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.