The metz mecastudio bl 400 flash head is an excellent flash head for studio photographers looking for a high quality product at a reasonable price metz have focused their 70 years of experience in the photo flash field into producing this cost effective yet highly capable and well built head with top of the line features with 400w output and a guide number of 65 the bl 400 is powerful enough for most applications and settings and further boasts an integral adjustable modelling lamp overh