This is 1 lb of Sodium Bisulfite from Photographers' Formulary. It is commonly used as an acidic additive in fixer baths as well as a preservative for various pyro developer solutions.

Acidic Additive for Fixer Baths    Preservative for Pyro Developers

Related Questions and Answers

Q: 1. does this work with the rode videomic pro plus?

A: Yes, the Rode LB-1 rechargeable battery is compatible for use with the VideoMic Pro Plus.

Q: 2. Does the 438 works with the MT055XPRO3 tripod and the MVH502AH fluid head?

A: Yes it does, and it is very well made. Although this setup is mostly used forvideo, it also works like a ball head and a gimbal head all in one when using a lens with a lens collar or camera with an L bracket.

Q: 3. Is it compatible with the iFootage Gazelle TC7?

A: Yes, the LB-75S and the iFootage Gazelle TC7 can work with one another.

Q: 4. Is the arm pin on this 7/8 or 5/8?

A: The pin measures in at 16.11mm, which closest converts to 1-5/8.

Q: 5. Does it work for Ronin S ?

A: You need something like this. Steadicam Steadimate-S Gimbal Collar & Base BH #STSDMSGIM • MFR #SDMS-GIM

Q: 6. Will this vest and arm work with the Steadicam Solo Stabilizer?

A: Yes it will work great. It's better if that handle is curved.

Q: 7. Does the leveling base rotate at all once it is mounted to a tripod, and before it is locked?

A: The leveling base will rotate all at once before it is locked yes.

Q: 8. Does this work with the crane 3 lab?

A: Yes, the Glide Gear G2G 505 Vest and Arm Stabilizer System can accept the Zhiyun Crane 3 Lab.

Q: 9. What is the "collar system base" for? It is not something for mounting to an apex correct?

A: The collar system base is what connects to the tripod. To be compatible the top plate of the tripod needs to be removable and needs to allow 70mm accessories such as this one to be placed in.

Q: 10. Does anyone know the dimensions of this vest/dual arms? I want to know if this would fit in a pelican 1510 or 1560 case. Came-TV doesn't seem to sell the case separately, and Pelican would be a nice substitute. Thanks.

A: CAME-TV suggests this case. Smith-Victor SoftCase with Wheels B&H # SMCW.