Recommendations for widefield telescopes/lenses <150mm focal length
I have a touptek Atr585m which has a 1/1.2 inch sensor. A lot of larger nebulae aren't really possible because of how cropped it is. I want to do the North American nebula, the Heart nebula, the veil nebula etc this summer/fall when I have time. It seems like looking at the telescope simulator on Telescopius that a focal length of 100-150mm would be good.
I'd like to find something under 300 dollars if possible.
The SV535 is a perfect option, but it doesn't have enough back focus to fit a filter wheel and I only have 1.25 inch filters. Any other ideas of what I should get? Thanks!