I am using a Nikon D40 camera (with AS10 type flash adapter) to trigger my Britek PS-300 Studio Flash via a sync cord. When it is on manual the flash is not triggered. However, when the camera is placed on automatic the flash goes off every time. I try to shoot the cameras with the "pop up" down but after shooting a few photos it pops up (by itself) although the flash adapter and sync cord is connected.
How do I get the Britek PS-300H studio flash to fire every time on manual. I use camera settings of: 640 f5.6 and iso Auto. I tried several combinations of camera settings but none worked consistently well.
Read more: How to trigger Britek PS-300H Studio Flash with Nikon D40 via sync cord?