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Light meter advice

I found that the easy solution for me was to purchase a Pentax Digital Spot Meter and sent it with my cameras to be all calibrated together. It turns out that my Hasselblad PME had to be calibrated by Hasselblad New Jersey. Now everything agrees: refectance, incident and spot.
 
For the money, this is about the best gadget you can ever hope to buy.

https://www.amazon.com/Sekonic-L-30...p-B079YWCZNC/dp/B079YWCZNC/ref=dp_ob_title_ce
 
I've been using my micro 4/3 camera for metering lately. There's a spot mode that varies in degrees depending on the zoom setting of the lens. How would you calculate the degrees of the spot?

Based upon which camera you use, you are given a visual reference for the spot area. Calculate what fractional percentage of the full image height is covered by the spot. For example if its actual size was 7mm, and your frame was 14mm tall, that is 50% of the frame height. Then, consulting a Angle of View of a specific lens on your camera, simply take 50% of that angle as the spot size with that lens!
 
You know, after all the great advice I got in this thread... I wound up buying a used meter on Craigslist. I'm pretty happy with the results thus far...

 
Wow!
You found that on Craigslist?!?!?
Nice.
 
It's been a few years but I bought an unused Sekonic 398A (latest version) in the box with all accessories including the direct reading slides for fifty usd off of a craigslist listing. Good choice on the Minolta.
 
I did that and came up with around 1.5 degrees for my Olympus E-PL1 micro 4/3 with the zoom lens at 42mm. Almost a 1-degree spot. Not too shabby.