Question about Manfrotto L-rail RC4 (410PL)

Manfrotto's "RC4 (410PL) L-Rail" is designed to be compatible with specific tripod heads, rather than the tripod itself. Here are the key points to consider for your setup:

- Tripod head compatibility: The RC4 L-Rail (410PL) is compatible with Manfrotto 405 and 410 Geared head tripods.
- Compatibility with Manfrotto Be free GT aluminium tripod: The Manfrotto Be free GT aluminium tripod generally uses a different quick-release plate. You will need to check if the Be free GT tripod head is compatible with the RC4 (410PL) plate. If not, you may need an additional adapter.

- Nikon D850 compatibility: The RC4 L-Rail (410PL) is compatible with most cameras, including the Nikon D850, provided you use the correct quick-release plate and screws (1/4'' and 3/8'').

In summary, to use the RC4 L-Rail (410PL) with your Manfrotto Be free GT aluminium tripod and Nikon D850, ensure that the Be free GT tripod head is compatible with the RC4 (410PL) plate, or use an adaptor if necessary.