Kowa's spacer ring increases system magnification while reducing the minimum working distance, which is helpful when attempting to zoom in closer when the camera cannot be repositioned. Kowa's spacer ring also enables the user to attach a C-mount lens to a CS-mount camera.
Small setups w/ vintage projection lens - Cameras - EOSHD Forum
Direct Connection Kit for Kowa 16-H and Vazen Variable Diopter
How To Choose A Lens For Machine Vision Cameras: Authored by Scott Israel, PDF, Pixel
Kowa TSN-AR43 43mm adapter ring
KOWA PROMINAR 16D AND 16S BACK FOOT ADAPTER - Redstan
Ultra telephoto photography is easily achieved with your telescope by purchasing Kowa T-mount adapter, along with the SLR camera adapter which works with your telescope. You'll need to take precautions to minimize vibrations, such as locking up the mirror if possible as well as using a cable release or remote control to fire the shutter. First, remove the eyepiece.
Kowa TSN-CM2 T-Mount Camera Adapter Ring (Canon EF) TSN-CM2-CE
Acessories for Hyperion- and Morpheus-Eyepieces / Rings / 2 Filter adapter for DSLR-camera-lenses
Designed Camera Partd — Kyle Fasanella
Takahashi Vari-Ring Spacer - TKA31581
Canon 50mm f0.75 XI Lens Review – allmyfriendsarejpegs®
POV Lenses Archives - C Mount
Description The wide angle manual lens “KOWA PROMINAR 25mm F1.8” has a large field of view and bright F-stop. A greatly reduced TV distortion value of just 0.59% and a minimum focusing distance of 2m ensures high quality close-up pictures with a wide angle. Dual Link Iris A dual Link Iris system makes it possible to choose silent or click aperture adjustment.
Kowa Prominar MFT 12mm f/1.8 Lens (Black)
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Pentax/Ricoh FP-RG20 20mm Spacer
Kowa TSN-553 Prominar 15-45x55 Angled - Optics-Trade