https://eu.primalucelab.com/optical-tubes/ritchey-chretien/
Optical tubes - Ritchey-Chretien: Shop online | Primalucelab.com
Ritchey-Chretien telescopes are the perfect instruments for deep-sky astrophotography and research. Here with ESATTO focusers or SESTO SENSO focusing motors.
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https://meadeuk.com/Guidescope-Rings-and-Rail-12-inch-Meade-LX-Optical-Tubes.html
Guidescope Rings & Rail (Meade 12" LX Optical Tubes) @ Meade Instruments UK
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https://tichawa-vision.de/en/2022/optical-scanning-of-bores-and-tubes-now-also-from-3-mm-inside-diameter/
Optical scanning of bores and tubes now also from 3 mm inside diameter - Tichawa Vision GmbH
Apr 19, 2023 - Tichawa Vision has now expanded the product portfolio for inner diameters from 3 mm. For this, we use a very compact camera with a cross-section of only 1 x 1...
https://www.planthealthinternational.com/de/shop/lw2570-0-2ml-8-strip-tubes-with-individual-attached-optical-caps-120-26245
0.2ml 8-strip tubes with individual attached optical caps - 120 | Plant Health International
https://www.geriatricsandaging.com/de/shop/lw2535-0-2ml-8-strip-thin-walled-pcr-tubes-separate-optical-caps-125-38041
0.2ml 8-Strip Thin Walled PCR Tubes & Separate Optical Caps - 125 | Geriatrics and Aging