Cropping a 23mm shot to 50mm in post

[SsSsSsSsSnake]

How would one calculate the crop to simulate a 50 mm,?
Thanks

 

[AndrewFlannigan]

Perhaps this will help...

https://www.pointsinfocus.com/tools/depth-of-field-and-equivalent-lens-calculator/#{%22c%22:[{%22f%22:13,%22av%22:%228%22,%22fl%22:50,%22d%22:3048,%22cm%22:%220%22}],%22m%22:0}

 

[Nod]

I'd shoot 2 frames with a zoom, of the same subject. Ideally something like a brick wall (so I could get an easy sense of scale to compare between the 2 shots) then use those shots as a template to do the crop.