RB67 Pro-SD, 127mm question....

Screwdriver · Jan 29, 2010

Ok....got my RB67 from KEH today and feel like a dumbarse....35 years of photography :confused:

So the 127mm has three rings.....aperture, shutter and ?...What does the first ring at the front do? It has distance markings like focus. So what is the purpose?

stradibarrius · Jan 29, 2010

manual DOF.

Screwdriver · Jan 29, 2010

stradibarrius said:
manual DOF.

Ok, so I am used to setting DOF with the aperture...so how is that ring different? What is the neutral point on the scale? Any manuals for that lens....did a search, but I got bupkus.

unclemack · Jan 29, 2010

It's just a depth-of-field indicator.
Some RB lenses have a floating element controlled by a similar ring but not the 127.
Eg. set the infinity mark to the right-hand f32 mark and the left-hand f32 mark is at a smidge over 10 feet/3meters so 10 feet to infinity is your DOF at f32.

paul ron · Jan 29, 2010

That front ring does nothing. It's a DOF reference calculator.

Jeff Searust · Jan 29, 2010

yup-- not a damn thing-- connected to nothing

Screwdriver · Jan 30, 2010

paul ron said:
That front ring does nothing. It's a DOF reference calculator.

That's what I thought.....Damn Japanese, always adding stuff, just to add stuff.

John Koehrer · Jan 30, 2010

Screwdriver said:
That's what I thought.....Damn Japanese, always adding stuff, just to add stuff.

Just like cupholders from Detroit.

RB67 Pro-SD, 127mm question....

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