1080p render through a simple, modified, Keplerian Doublet telescopic lens with a small air gap of 20mm. Sensor distance 136mm f/4 aperture stop

denoised 720p video using OIDN

1440p render, took just under 5 hours to render with 1024 - 10000 samples per pixel 0.01 variance threshold, 10 bounces max with rr