These are some of the accessories and triggers I use when I need to rack focus and/ or shoot timelapses and astro.

HT7S is a precision on-camera monitor with an amazing 2000 nits Ultra High Brightness and innovative Touch LCD screen, capable of controlling your video camera's menu on set. A solid piece of kit, it is designed specifically for the outdoor photographer and film maker.
YoutTube Review

One of the best mounts I have found to mount a monitor!
SmallRig Adjustable EVF Mount with NATO Clamp MD3507 is designed to mount a monitor and other accessories onto a camera kit, allowing free repositioning of accessories in a variety of shooting scenarios. It supports any monitor of up to 1.5kg and enables 360-degree adjustment via three pivot points. Its spindle arm can be extended to a maximum of 62mm to meet the demand for different monitoring distances. With universal NATO clamps at both ends and NATO rail, you can assemble and disassemble the EVF mount quickly and mount it anywhere with no NATO rail. In addition, the tightness of each pivot point can be adjusted via the knob wrench.
YouTube Review

The SmallRig F60 is the combination of lightweight structural materials, outstanding craftsmanship, and beautiful, durable Sapele mahogany wood, making the
F60 an impressive Manual Follow Focus System
Fenchel & Janisch did a nice piece on this.

The Olympus EE-1 Dot Sight is a shoe-mount dot sight ideal for super-telephoto photography of wild birds in flight. Read about it on the Olympus website
Focus Review.com did a nice piece on this.

A lovely little bluetooth trigger that does the main bits it is supposed to do. Read about it on their website
A video review of the Pulse.

A remote shutter release that provides me with enhanced levels of exposure control. Featuring specialized functionality such as continuous shooting, self-timer, long time exposures, and interval shooting, the ShutterBoss II is a huge asset in my bag.
Read about it here.

My flash - the build quality is good and it feels solid and is feature rich - supporting e-TTL (II), HSS, 2nd curtain sync, wireless master and optical slave modes, auto and manual zoom, flash exposure compensation, flash exposure bracketing and much more… YN568EX II is a great alternative to much more expensive Canon 580EX II, 430EX II or 600EX-RT flash speedlites, offering the same functions and same or more power at much lower price.
I found a good review here.

The Radiant Diffuser is a custom built light modifier for macro photography which provides a soft even light while photographing any macro subject like spiders, insects, snakes, frogs etc..It can be customised to fit any type of flash head shape thanks to the efforts of Girish Gowda.
You can view Girish’s assembly video here and I can vouch for its effectiveness. You can reach Girish Gowda here 099864 39974.

A tiny waterproof solution for some additional light on the go. Read about it on Lumecube.com
For the Lume Cube Air

Motion Control in your pocket. The Genie Mini II is an extremely easy-to-use, portable device to create smooth panning motion time-lapse or video.
On Youtube.

Field Recording Gear