This is a resolution test
TEC 250/20 Mak Cass (D=250 L=5000), ST402ME, Image Scale 0.37"/px
1 sec per frame, 104 frames captured, processed with AVIStack2. Best 10 frames stacked
Image above has been resampled 400% to smooth pixelation but shown 1:1 on screen.
Images in measurements, below, from the unresampled stacked FITS but zoomed on screen

Current separation ~ 2.3"
I get with assorted methods a FHWM of about 1.08"
Epsilon Lyrae 2