Note from a professional photographer. I've been doing film photography since the 1950's and digital since about ten years ago. The blue colored flash bulbs provided the bluish light needed by outdoor type film for the right color balance when using flash indoors. That camera has NO flash mount that I've seen and you have to guess or measure the distance ... it has no focus metering. I'm still exploring mine which I bought earlier this evening, but I've been told it was very high quality for it's day and capable of professional quality images in the hands of a professional or advanced photographer. Have fun with it. I'm not sure on the pricing of it, but new they were quite expensive. Mine is from the 1930s which is older than I thought it was.