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MASTER
LENSES |
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Master lens for 054 finder back
adjustment (054-5202-79) |
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The Minolta master lens for finder back adjustment is
basicly a MC Rokkor-PG 50/1.4 without diaphragm and aperture ring. It
has a special focusing mechanism, which allows focusing around
infinity in a very small range. Its prupose is to figure out, if the
focussing screen is in the correct position.
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Since it has not the usual focussing range, the distance scale numbers are not painted, just the infinity index is marked. The lens has a special highly precise machined bayonet mount. Note the lack of the pre-set pin.
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The white mark indicates a distance of exactly 43.58 mm between the bayonet flange and the image plane for infinity. Using a collimeter, a target is focused watching the split screen in the view finder. The colored lines represent a change of a 1/100 mm in flange back, so one can determine a misalignement directly. A service technician has attached a sticker with the marking for the X-700.
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With X-1 and XE cameras, the finder back distance has to be 43.58 mm ±0.02 mm. This is represented by the first two yellow lines besides the white line. With the X-700, the default value is 43.565 mm ±0.02 mm.
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The bayonet flange seems to be made of a hardened steel, to prevent any abrasion and keep the exact flange distance.
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