Mamiya RB67 - Close-up Photography with the Auto Extension Tubes; Attaching and Detaching Extension Tubes; Notes on Extension Tube Usage; Finding the Exposure Compensation Value

• Close-up Photography with the Auto Extension Tubes
Attaching and detaching the auto ex-
tension tubes is accompli s hed in the same
manner as with the
lens. When initially
mounting a lens to the extension tube , cock
both the lens and the tube. The auto ex-
tension tubes couple with the automatie
aperture 01 the lenses.
For exposure compensation , reler to the lollowing table. Reading 01 the exposure
compensation scale differs Irom that when not utilizing extension tubes.
2. For close-up photography , we recommend independent mirror-releasing prior to each
actual photograph. This omits or minimizes any residual camera body movement due to
mirror action.
3. When photographing through the extension tub es, use as small an aperture as possible .
4. When photographing in the 6 x 7 size, il the 127mm lens is used, minimal or no c orner
vignetting will occur, however , when using lenses other than the 127mm lens with two ex-
tension tubes (No . 1 and No. 2), the possibility 01 some vignetting in the lou r corner s 01 the
picture may
oc cur. When using only one extension tube, no v~netting will occur with any lens.
5. When photographing with the Polaroid Land lilm pack, corner vignetting increases due
to the
larger picture size, however a 6 x 7cm portion in the center 01 the photo will be es-
sentially clear 01 vignetting.
6. Use only one auto extension tube No. 1 lor the 65mm lens.
7. Since it will decrease resolving power due to exce eding lile-size , do not use the auto
extension
tube with the 50mm lens.
26
1. Distance indicates the distance lrom
the Iront edge 01 the lens barrel to the
subject.
2. Subject coverage is the size 01 the
subject to be photographed on the lilm .
3. The ligures in the left column 01 the
close-up table indicate no bellows ex-
tension The ligures on the right indicate
when the bellows is extended to the maxi-
mum (46mm).
How 10 Find Ihe Exposure Compensalion
Value
1. After locusing the lens, read the ex-
tension amount through the bellows exten-
sion
scale on the top 01 the distance scal e.
2. Find the compensation value by the
" Bellows extension scale / Exposure com-
pensation value" located on the right side
01 the close-up photography table.
For example , assume that 127mm lens is
locused after combining it with No . 2 auto
extension tube.
11 . the extension amount
reads 35mm by the bellows extension
amount scale , it is understood that the com-
pensation value is + 2 steps by the scale
located on the right side 01 the close-up
photography table . In this case, increase
exposure by setting the shutter speed dial
at two steps slower or by opening the aper-
tu re by two steps .