[Aurorae (Sara)]

Originally Posted by JA

As stated, the Nikon 300mm f/4 AF-S is sharper, gathers more light (116% more) and is objectively (on test) sharper and much less distorted than the Redcat 51 in terms of star ovality/roundness. It is also a little more up-close than the 250mm focal length of the Redcat 51, that you're considering. For $700, in astro terms, it's for free.

You are doing really well convincing me, but I just wanted to get clarification again on your thoughts on the AF-S NIKKOR 300mm F4 D lens or something like the Nikon AF Nikkor 300mm f/2.8 ED IF?

It is one stop of light difference, which for deep space could be better, and it does have a drop-in filter option, with would be good for H-a. The weight difference is the f4 is 1.5kg and the f2.8 is 2.5kg, but the latter still possible to fit within the parameters of the 5kg payload (which increases with counterweights) and the Z7ii, which is light.

Also, do you have any examples of DS objects taken with the 300mm?

Thanks again