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Frequently asked questions

Fit, filter sliders, tilt, backfocus and orders. If your question isn’t here, ask us.

Fit & compatibility

Almost certainly. The Photon Cage mounts to your camera, not the scope, so it works on almost any telescope: RASAs, SCTs, Epsilons, refractors, Newtonians and RCs. You connect it to your optical train with a standard baseplate thread.

Standard 90 mm and 78 mm cages fit ZWO and QHY cameras, including the ZWO 2400, 2600 and 6200. Adapters cover Player One and Moravian bodies, and dedicated systems take the RASA 8 and RASA 11 to full frame. Ask us if you’re not sure about your camera.

Yes. The Photon Cage works in filter slider or filter wheel configurations. The 6-bolt M2.5 pattern bolts straight to ZWO and QHY wheels.

On cameras with a removable tilt plate, such as the ASI 6200, the Photon Cage replaces the stock plate so you get proper tilt control without giving up backfocus.

Filter sliders

The Standard system takes 2-inch mounted (screw-in) filters on a 42, 48 or 54 mm baseplate, with sliders in 3D printed or CNC aluminum. The PRO system uses an M68 baseplate and is built for unmounted filters: 50×50 mm square glass in the CNC slider and 50 mm round glass in the 3D printed slider. Compare the systems.

Both slider systems mount to the Photon Cage, and the individual sliders slide into the system’s holder. Sliders are sold individually, so you can add filters over time.

Tilt & backfocus

The four adjusters use 120 TPI threads, about 0.21 mm per turn. Each corner works like a table foot, so a 1/32 turn moves the corner of a full-frame sensor by about 3 µm.

No. Backfocus is independent: the push-pull outer ring moves the sensor in and out without touching your tilt, so you can set the spacing your corrector wants.

Yes, with the Electronic Photon Cage. Four motors adjust tilt with about 1 µm resolution and give you about 2 mm of motorized backfocus, so remote rigs stay flat.

Shoot a star field and look at how focus changes across the frame. Our video series shows the process with Hocus Focus, and Astro PM maps tilt and curvature across your subs so you can see which corner to turn.

Orders & support

Every unit is hand built by us in Oregon, and every design is tested in our dual-dome observatory.

Yes. We ship from Oregon, and our customers are on almost every continent.

We fix any defects. Refunds are a separate policy: 30 days, unused items only, with a restocking fee. See the refund policy.

Yes. Our custom build service covers consultation, build, sky-testing under our domes with live remote access, and worldwide shipping.

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Hand built by us in Oregon, tested in our dual-dome observatory, and trusted by hundreds of imagers on almost every continent.