Maris, koraks, the OP seems to have hung a 300 mm telephoto lens in front of an Ilex #3. This puts the lens' rear node a good distance in front of the lens' diaphragm and farther in front of the shutter's aperture. It might act as a stop.
Maris, koraks, the OP seems to have hung a 300 mm telephoto lens in front of an Ilex #3. This puts the lens' rear node a good distance in front of the lens' diaphragm and farther in front of the shutter's aperture. It might act as a stop.
This is the lens/adapter/shutter configuration. The lens has the mount thread just behind the iris, about a third the way along the barrel, hence the long adapter otherwise the lense would clash the shutter.
Sorry bout the dark image, it's early morning and I don't want to disturb my significant other turning on lights...
Right. The eight stop difference is huge, and the reason I though the OP was shooting through the film base (although I'm not even sure that would give you eight stops).
Fair question. I too have trouble with 8 stops.
Here's a test for the OP. Hold the lens/shutter at arm's length with the shutter open and its and the lens' diaphragms both fully open. Looking through the lens from the rear, slowly close the lens' diaphragm until the blades just become visible from the rear. What's the marked aperture at that point?
Immediately. I can see them start to move off max 6.8. I can see them past the 'mask' near the rear element. It's like an uninterrupted tunnel, all the projections - lens iris, mask, shutter iris all look the same diameter.
I'm hoping I can get time to contact print the under-ok-over negs in next couple of days so I can post them with accompanying data. Maybe they will shed some light, if you'll excuse the pun.
Rob
Ok, lets go back to check the film base way round. Maybe I can put it to bed yes I've put it in right or no I've screwed up. I've looked at the negs and I know the subject was looking to MY left when I took one of the images. My brain is hurting trying to juggle which way the notches/emulsion/head direction is cos everything turns upside down and back to front.
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