Novoflex BALNIK-AS. Bellow

Offered for the enthusiast, collector, or demanding macro photographer:
An original Novoflex BALNIK-AS automatic bellows unit with integrated focusing rail and an integrated adjustment carriage for the Nikon AI/AI-S system. Still new and unused (New Old Stock / NOS). Rare in this condition. Still with the original box. "W. Germany" imprint from the production period 1988-1993).
Key advantage (AS version):
This is the sought-after version with the slanted rear side. Thanks to this clever cutout, the bellows unit fits smoothly onto larger camera bodies (such as the Nikon F4, F5, D800 series, etc.) without fouling the grip or the bottom of the camera.
Specifications:
Type: Automatic bellows unit with integrated focusing rail.
Camera & Lens Mount: Nikon AI/AI-S bayonet (Nikon F-mount).
Rear side (AS design): Featuring a slanted cutout at the bottom of the rear block. This provides extra physical space, so the device fits on cameras with a thick grip or battery grip (such as the Nikon F4, F5, D800 series, etc.) without issues.
Material: High-quality anodized aluminum (matte black) with chromed steel guide rails.
Weight: 430 grams.
Macro & Extension Range:
Minimum extension (bellows collapsed): 50 mm [1, 2] (this determines the minimum magnification you can achieve with a lens).
Maximum extension (bellows fully extended): 130 mm [1, 2] (for extreme macro magnifications).
Adjustment travel of the adjustment rail: 65 mm [1, 2] (this moves the entire setup forward or backward on a tripod to precisely focus without changing the magnification factor).
Signal & Function Transfer:
Mechanical diaphragm coupling: Fully built-in.
The device supports automatic pre- and post-exposure metering via a mechanical lever and open-aperture metering (offenblendmessung) through the internal mechanical lever.
No electronic EXIF data or autofocus signals are transmitted.
Lens compatibility:
Fully compatible with manual Nikon AI and AI-S lenses, as well as older AF lenses with a physical diaphragm ring. Not suitable for Nikon G-type or E-type lenses, as these have no movable diaphragm to adjust manually. [1, 2]
Photos are part of the lot.
Shipping with Trace and Tracking.