Quick answer

Buy the Nikon AS-21 if you need to stand your SB-910 or SB-900 on a flat surface or mount it on a tripod, the SJ-900 set if you shoot under fluorescent or incandescent light, and the SS-900 if you want a dedicated soft case for storage and transport.

Why these three accessories cover different jobs

The AS-21, SJ-900, and SS-900 are not interchangeable upgrades. One gives the flash a stable base, one corrects color under specific ambient light, and one protects the flash when it is not in use. Choosing correctly means matching the accessory to the problem you actually have, not buying every item in the same category.

Where compatibility stops and judgment starts

Nikon lists the AS-21 for the SB-910 and SB-900, and the SS-900 for the SB-900 while noting it also fits the SB-910, SB-800, and SB-900 accessories. The SJ-900 set is described around the SB-900 flash. The catalog does not list every flash model each item fits, so if you use a different Speedlight, confirm the fit before ordering rather than assuming it carries over.

The trade-off between a stand and a tripod socket

The AS-21 works as a flat-surface stand and also has a 1/4"-20 threaded tripod socket on the bottom. That makes it useful both on a table and on a light stand or tripod, but it is a support accessory, not a light modifier. If your goal is softer light or color correction, the stand alone will not change the quality of the flash output.

Decision rules for buying SB-910 and SB-900 accessories

  • If you need to place the flash on a table or tripod: Choose the Nikon AS-21 Speedlight Stand. It is made for the SB-910 and SB-900 and includes a 1/4"-20 tripod socket, so it covers both flat-surface and tripod use. Check that your tripod or light stand has a matching 1/4"-20 stud before relying on the socket.
  • If you shoot under fluorescent or incandescent light: Choose the Nikon SJ-900 Colored Filter set. The FL-G1 and FL-G2 filters address fluorescent ambient light, while the TN-A1 and TN-A2 filters address incandescent light. Match the filter to the actual room light, not to the flash model alone.
  • If you need protection between shoots: Choose the Nikon SS-900 Soft Case when you want a dedicated case for an SB-900, SB-910, or SB-800. It is a soft-shell design for dust, dirt, and scratch protection, not a hard case. If you need crush protection, this soft case is not the right product.
  • If you use a different Speedlight model: Do not assume these accessories fit. The catalog confirms the AS-21 for the SB-910 and SB-900, the SJ-900 around the SB-900, and the SS-900 for the SB-900, SB-910, SB-800, and SB-900 accessories. Verify your model before ordering.

Product facts at a glance

  • Nikon AS-21 Speedlight Stand for SB-910/900 Flash: The Nikon AS-21 is a speedlight stand for the SB-910 and SB-900 with a 1/4"-20 threaded tripod socket on the bottom. It lets you set the flash on a flat surface or attach it to a tripod without holding it.

    Nikon AS-21 Speedlight Stand for SB-910/900 Flash

    Nikon AS-21 Speedlight Stand for SB-910/900 Flash

  • Nikon SJ-900 SB Flash Colored Filter: The Nikon SJ-900 set includes four colored gel filters: FL-G1 and FL-G2 for fluorescent light, and TN-A1 and TN-A2 for incandescent light. It gives you a way to balance flash color to common indoor lighting instead of fixing every shot in editing.

    Nikon SJ-900 SB Flash Colored Filter

    Nikon SJ-900 SB Flash Colored Filter

  • Nikon SS-900 Soft Case: The Nikon SS-900 is a dedicated soft case for the SB-900 that also fits the SB-910, SB-800, and SB-900 flash accessories. It provides dust, dirt, and scratch protection during storage and transport for several Nikon Speedlight models.

Who these accessories suit

Best for

  • Photographers using a Nikon SB-910 or SB-900 who need a stable stand or tripod mount
  • Shooters who regularly work under fluorescent or incandescent light and want to correct flash color
  • Owners of an SB-900, SB-910, or SB-800 who want a dedicated soft case for storage and transport

Not for

  • Photographers using a different flash model without confirming compatibility
  • Anyone who needs a hard case or crush protection rather than a soft case
  • Buyers looking for a light modifier or diffuser, which these accessories do not provide