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120 RF's 120 / 220 format rangefinders including Fuji, Koni-Omega, Mamiya Press, Linhof 6x7/6x9 cameras, Mamiya 6/7 among others, but excluding the 120 folders and the Voigtlander 667 cameras that have their own forums.

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Broni RF645 metering
Old 07-17-2007   #1
DavidH
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Broni RF645 metering

Just arrived back from Iowa - somewhat jetlagged - to find my new Bronica RF645 has arrived...

Quick question to you seasoned users...any quirks about the metering that I should know about?

cheers

Oh, and thanks to Monz for answering a barrage of questions a few weeks ago.
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Old 07-17-2007   #2
Monz
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Hi David,
Congratulations on the purchase. The meter is a (kind a of) centre-weighted system and is pretty accurate for most situations. However, as with most cameras, one has to compensate for strongly back-lit situations or if the picture is far removed from an average 18% grey scene. The handy dial at the back allows upto +/- 2 stops compensation. The manual says the following.....

"
A light metering sensor located to the side of the viewfinder objective
lens measures the photographing area in five independent segments
and calculates the correct exposure by a center-weighted multiple-
field comparative algorithm.The metering system calculates the
correct exposure based on the lens's photographing field, the brightness level of the photographic subject, the contrast among metering segments and miscellaneous factors to achieve the best photographic image reproduction. Refer to 6. References (Exposure
Measurement Sensitivity Patterns).
Note 1: The impact on exposure settings of any filters attached to the lens must be taken into consideration to determine the correct exposure when compensation for the exposure determined by the external metering system of the Bronica RF 645.
Note 2: The metering range of the Bronica RF 645 is from EV 3 to EV 18 with the 65mm standard lens at ISO 100. EV 3 (at ISO 100) is an exposure level designated by a combination of f/4 aperture and 2 second shutter speed. EV 18 (at ISO 100) is an exposure level designated by a combination of f/22 aperture and 1/500 sec. shutter speed.
Note 3: EV level varies when any film speed other than ISO 100 is used, or exposure compensation is applied.
"



If you didn't receive a manual with your camera, a pdf can be obtained from...

http://www.tamron.com/assets/pdfs/RF645.pdf

All the best.

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Old 07-17-2007   #3
Lou Iaquinto
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Hi David,

Like Monz said, use the "handy dial on the back;" works very well.

Enjoy,

Lou
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Old 07-17-2007   #4
DavidH
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Thanks for the info guys - and for the pdf link Monz...I'm very comfortable with centre weighted metering so should be fine. Now just waiting for daylight...
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