Celestron 93402 T-Ring Adapter for Nikon Digital Cameras, Black Review (2026)

Who this Nikon T-Ring is for

Celestron built the 93402 for Nikon SLR and DSLR owners taking their first step into prime focus astrophotography, where the telescope itself replaces a camera lens. It attaches to the camera body the same way any Nikon lens would, using the standard bayonet mount, which makes it approachable for photographers who already know how to change lenses but have never connected a camera to a telescope before. It is a single piece part rather than a complete imaging kit, so it suits someone building a system piece by piece or replacing a lost or damaged T-ring, more than someone wanting an all in one solution out of the box.

Build, mount and thread details

Celestron builds the 93402 from black anodized aluminum, with internal surfaces both blackened and glare threaded to cut down on reflections that could otherwise show up as stray light in long exposures. The camera side uses a sturdy bayonet flange that locks into Nikon F mount bodies just like a lens, while the telescope side offers standard T threads that accept a separate T adapter or other compatible camera accessories. A ribbed outer surface gives a secure grip for threading and unthreading the ring by hand, and Celestron backs the part with a two year warranty against defects, which is a reasonable length for a simple mechanical accessory like this.

How it fits into an imaging setup

On its own, the 93402 only gets you halfway to a working prime focus connection, since you still need a T adapter that threads onto the T-ring on one end and slides into your telescope's focuser on the other, such as Celestron's own T-Adapter with SCT or a 1.25 inch universal T-adapter depending on your telescope's focuser size. Once both pieces are threaded together, you remove your camera's lens, attach the T-ring in its place, and slide the assembled adapter into the focuser where an eyepiece would normally sit. Celestron notes this style of T-ring works best on compact DSLR bodies rather than larger professional camera bodies, which can be too bulky and heavy for a typical focuser to support safely.

Trade offs and comparable T-rings

Against SVBONY's SV194 T-Ring for Nikon, the Celestron 93402 offers similar core functionality with the backing of Celestron's own warranty and wider retailer availability through telescope specialty shops. Bundled options such as Celestron's own T-Adapter with SCT 93633-A and this 93402 T-Ring sold together remove the guesswork of matching parts, which is worth considering if you do not already own a compatible T adapter. The clearest limitation stays the same across any single T-ring purchase: it is one link in a chain, not a complete solution, and Nikon Z mount mirrorless shooters need an FTZ style adapter added on top since this ring is built for the older F mount.

Verdict and who needs something different

For a Nikon DSLR owner who already has or is buying a matching T adapter and wants a well made, warrantied connector piece from an established telescope brand, the 93402 is a straightforward and reliable choice. Buyers starting from zero should budget for the separate T adapter at the same time rather than assuming this ring alone will connect a camera to a telescope, and Nikon mirrorless owners need to add a mount converter into the chain as well. Anyone wanting a single bundled purchase instead should look at a combined T-ring and T-adapter kit rather than this ring on its own.

Frequently asked questions