I bought this, open box, from Adorama in 2022 and never use it. It is adjustable across four stops in increments of half stops, and it has a 3.5 mm jack but lacks radio triggering [https://adorama.com/fplfbf300.html]. Altogether, then, it may work well as an optical slave where ample power is sought.
Pickup: in a cooperative apartment building's lobby, with electric outlet and security cameras, at 355 8th Ave at W 27th Street. Payment options: 1) cash weathered and smoothed by substantial circulation, not crispy new or merely crumpled, or 2) Zelle transfer via my email address once a $1 test confirms instant transfer.
Contact options: If emailing, cover three issues—pickup location, desired time window, and payment agreement—plus all other, relevant concerns when sending the first email. CL chat is more flexible, but I reply there only when at my desktop computer. Otherwise, I prefer all coordination to be by email, which goes to my phone. Texting or voice call may become options for individuals who read and heed this full ad.