Auto Exposure zooms versus manual

[Steven Budden]

I'm trying to decide whether to buy a manual zoom or an automatic exposure zoom for my bolex. What should I consider when choosing? In what circumstances does the auto exposure come in handy? I know I read of a lot of people having the POE switar converted to a manual zoom. Why might one prefer a manual?

 

(For instance, a POE or PTL vario switar vs. MC vario switar)

 

Thanks for any help.

 

Steven