Can you get a Mamiya RB67 with a photometer mounted on the visor?

I've been doing some research on the Mamiya RB67 and wanted to know if Instead of buying an external light meter if I could buy a lens to put on the top of the camera and I would be able to adjust the settings there as much on a digital camera

B & H – Http: / / www.bhphotovideo.com – has the Mamiya PD Prism Finder (measured), provided for $ 1,299.00. Mamiya Catalog # 214-499. There are a couple on eBay for under $ 500.00. A used Minolta Spotmeter M would be much cheaper.

Fringe satellite & UFH signal meter / finder

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