tried and experimented on what I learned from Graphics Expo product photography seminar with Ibarra Deri with one (1) SB900 & white shoot through umbrella on CLS with D90

thank you Mel (Patek Philippe boutique store @ GB5) for adjusting and teaching me how to adjust a perpetual calendar.

1) must adjust perpetual calendar watches only at 6am

2) follow watch manufacturer's recommended service schedules

3) use a watch winder for perpetual calendar watches (a must to minimize the adjustments made on perpetual calendars). if you have a watch winder; follow the recommended battery replacement schedule