View>Align view>Align Active Camera to View and align active camera to selection. (Active camera is one set in Scene properties panel curently, Cone,sphere,dot pic)
Works for orientation but not for resolution or side ratio unfortunately.
With both camera object selected and camera view on you can use Ctrl+B to crop the camera frame on screen and move frame borders after that very precisely. Then you can check in "crop to render region" in Dimensions panel ( Printer pic, below resolution inputs} .
I don't know a way to render that cropped region in exactly specified resolution. Maybe with scale(absolute) and crop nodes in Compositing window but honestly it's simpler to downscale in Photoshop or like.
ps. With ortho cam you can also try to set/match the camera frame without crop region by picking camera frame border itself in camera view ( camera object selected) and move mouse around before releasing left button for scaling ortho view and also GX or GY to move around .
With perspective camera you can make a plane object of desirabe side ratio. Say scale a square plane to Z 0,5. then set camera resolution to 1024x512. Then Align active camera to selected object. (plane) It would make a perfect match.
Unfortunately it works not that perfect with ortho camera but you can still ortho scale it the way I described earlier
Yeah, I've already tried ctrl+alt+numpad0 and adjusting it manually. Just really need a quicker way to do it like octane render, where the viewport naturally is the camera. Shouldn't sound absurd to implement if Octane has this feature already. Thanks for reply
Not sure if this is what you're asking for, but you can lock a camera to the viewport by going into the N panel > view > view lock and tick lock camera to view.
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