This is the best of half a dozen attempts of a plates of these bulbs. Was having some chemistry problems which resulted in me filtering my dev and my silver nitrate a few times. Not sure its solved the problem so I’ll have another shoot tomorrow afternoon.
Used one of the small brass un-named projector lenses. Its about F7 ish. So exposure was about 25 seconds with window daylight. Was pleased to see that at this distance it seems to cover the whole 5×7 plate. And again we can see how the windows have solarised in the reflection of the bulb glass.
5×7 clear glass ambrotype.