This is probably one of my best most well thought out suggestions to date for improvement of content. If this can be implemented on some level as described below it would be a huge boost to consistency and repeatability across ALL scenes done by SLR not just a few here and there. Let me know of you have any questions or need further clarification.....
As an engineer who has designed many algorithms to cater to the VOC (voice of the customer). Best way to do this.... There should be certain angles/distances you avoid entirely (i.e either not realistic/immersive at all or distance is just too far or too close) and then a RANGE of acceptable distances. So each position essentially should have an acceptance range. Ill give a few general examples: For instance lean back cowgirl can be incredible when shot right or terrible when the girls face and body are too far back and get blurred/fuzzy. You also dont usually the girls head when she is riding the guy all the way at the tip top of the lense sight field . That kills immersion (unless its specifically for a short time for boob smothering/slapping and or to stare at her torso/belly while gyrating on your cock).
Another key to this: always keep in mind with each and every angle what is the purpose of that angle. For instance, If its intimacy you want to be able to have a close look into her eyes face. Having the ability to see all key parts of the body most of the time and feel like its totally realistic is critical (even if you might occasionally need to tilt up or down depending on position).
Also in that acceptance range is going to be really focused on (no pun intended) getting the camera angles /distances in positions that would be the same in real life in those positions. As others have attested, Doggy is a huge example of this one. When this is dead on you really feel like you are right in that position, when it isn't it feels a bit surreal and that you are not really in the scene.
Pussy close ups should have two ideal sets of viewing distances: 1. Where you get a perfect view of her beautiful snatch and then (not too close where you are going cross eyed) 2. One where you truly feel like you are tasting her. This can be mixed together too if the girl goes a bit back and forth within a specified range.
Missionary [one of my faves when done right] should also have 2 ideal sets of viewing distances. 1. The full view. This is where the actress is usually flat on her back and you get a fuller view of her body and can see your member going in and out of her pussy at a perfect viewing distance without too much tilting up and down. 2. The intimacy view. This is where usually the actress leans upward a bit and you can look/stare right into each others eyes as you go in and out of her. You usually would start with the fuller view and then move into intimacy view as it is more immersive that way.
As for leaning forward cowgirl user 1MM1 nailed it with his input (copied below):
The forward leaning CG in "Si, Mi Amor" was amazing (link below). Best i've seen. Eve Sweet's face was close to camera (near my face) and her tits and penetration were still in clear view (around the 29:40 mark). Very intimate and amazing visually. Wow!
https://www.sexlikereal.com/scenes/si-mi-amor-30156
Same great forward CG camera position on another recent SLR release, "Giving Her Comfort" with Valentina Nappi. (around the 28:28 & 37:10 mark). I hope a minute or two of this forward CG will be in every SLR release going forward.
https://www.sexlikereal.com/scenes/giving-her-comfort-30458
Also another huge one. And I have seen more and more studios catch on to this... the straight up and down bouncing/riding on a cock if overdone gets boring quick. But gyrating/grinding on the cock in all cowgirl positions is a huge plus. Some girls are masterful at this as there are many ways to gyrate on that cock and when done right one can by hypnotized by a girls sensual /seductive movements while riding the guy. This is accentuated tenfold when the girl is at a realistic viewing distance from the actor.
***As a last bonus suggestion and I know this isnt exactly an angle/distance optimization per se but man I think a HUGE game changer in customer experience with the handy would be greatly enhanced if you had a slow stroke of the handy during intros that could either be synced with the opening intro misic and/or a slow building 'jerk off' stroke after opening intros to keep viewers at 'full attention ' during the beginning of the scene. These should be non full strokes (maybe a quarter stroke length building up no more than 50% and at a slower pace) . I love watching the 'well hello baby' opener and plot building but I find myself sometimes having to fast forward through because by the time the initial girl cock touching action takes place I am at half mast or less (especially on the back end of mutliple cup sessions).
