
Hersmay
The Hersmay CY‑20 is a ultra‑compact, universal manual flash unit with a 20 m guide number, 0‑90° tilt head and three trigger options. It runs on 2 AA batteries, delivers a fixed full‑power burst and is aimed at hobbyists needing inexpensive off‑camera fill light or light‑painting capability.
Pros
Current
$18.59
Average
$18.54
Lowest
$17.99
Highest
$18.59
Lower = better sales rank
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Cons
From Expert Reviews
Praised by Experts
Criticized by Experts
From User Reviews
Users Love
Users Complain About
Expert Opinion
Professional reviewers commend the CY‑20 for its simplicity, portability and surprisingly high guide number, noting it shines in niche scenarios like light‑painting or as a cheap bounce flash for tiny cameras. However, they criticize its lack of power control, long recycle time, audible transformer whine and inconsistent output during partial fires, positioning it as a budget tool rather than a precision studio light.
What Users Say
Everyday users appreciate the flash’s affordability, tiny size and straightforward operation, especially for creative projects like long‑exposure light painting. Common complaints revolve around the sluggish recycle, the inability to dial down power, uneven lighting and the need to supply their own AA batteries, which together limit its usefulness for fast‑paced or professional work.
Common Complaints
Slow 5‑7 second recycle, full‑power‑only output causing overexposure, audible charging whine, unpredictable partial fires, and rapid battery drain without included cells.
How It Compares
vs. Godox TT350
Advantages
Disadvantages
Choose the CY‑20 for ultra‑budget, ultra‑portable needs; choose the TT350 for feature‑rich, faster shooting.
vs. Yongnuo YN560‑IV
Advantages
Disadvantages
Select the CY‑20 when size and cost dominate; opt for the YN560‑IV when you need higher power and manual control.
vs. Disposable Camera Flash
Advantages
Disadvantages
Use the CY‑20 for reusable, brighter lighting; use disposables only for one‑off, ultra‑light situations.