The foggy area is directional, so it's not just due to the spinner being shiny on the inside. Are you sure you have the correct split between with/without the spinner ?
Ok, also, does the arm that holds the spinner need blackening ?
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The foggy area is directional, so it's not just due to the spinner being shiny on the inside. Are you sure you have the correct split between with/without the spinner ?
Ok, also, does the arm that holds the spinner need blackening ?
Hello
optically speaking, bright spinner and mirror aperture are a problem...
Do tests sun on you six
:p
J.Ph.
Yes, good point - if for instance the sun was off to one side.
The easy way to de-bug this whole issue is to put the spinner in place, open the shutter, remove the ground glass panel and put your inside the rear of the camera looking for glints from the spider/spinner though the lens. A sunny day would be best.
The lens was centered on the 8x10 sheet. I did a second identical image with the same exposure sequence and the dark slide all the way out, but did not process that sheet yet.
Since the spinner is acting like a lens cap for the center of the field, it probably needs to be very close to the lens too.
This one looks to be almost touching.
Attachment 244778
The shiny pieces were painted flat black taking care not to get paint on the ball bearing:
Attachment 244795
Attachment 244796
To improve the function of the aperture waterhouse stop, I added a 0.1mm 'wavy-washer' to the assembly, then applied blue loctite to the screw.
Attachment 244797
Attachment 244798
Attachment 244799
Ready for more testing:
Attachment 244800