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H16 Reflex Finder Mask Alignment


Nomad Zamani

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I recently acquired an original H16 Reflex and have a question about the alignment of the mask on the top of the prism.

 

When I look through the reflex finder, I see the outline of the finder itself, with the mask on the prism markedly offset to one side (see attached photo). If I swing the prism out, the mask outline disappears and I see the whole area with the hard black outline around it.

 

Am I right in thinking that this is out of alignment, or is it normal?

 

 

post-74894-0-49924000-1527181817_thumb.jpg

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The grey outline is the mask. When I slacken the one screw that's accessible, I can move the mask around a little. When I do that, its position changes in the finder. I'm not saying something isn't decentred in the finder's optical path, however. The issue with the mask is that the screw goes into a slot that allows it to move front to back (up/down in the finder), but there's very little scope to move it left/right - the side of the slot hits the screw. The attached shows it after some adjustment - moved down and left a little when viewed through the finder, enough to get the missing rounded corners into view.

 

I did take the plate off that covers the parallelogram prism and had a look. There were packers at the top and on the right-hand sloping face (viewed from the front), and it all felt pretty solid. I could have a closer look to see if it might have become decentred, although I don't think I want to take it out unless I have something suitable to use as replacement packers (I suspect the original ones will disintegrate).

 

post-74894-0-75050000-1527188308_thumb.jpg

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The prism at the end of the viewfinder tube should have 3 adjustments, you need a slotted driver (or a small tube filed to have to prongs) to turn the nuts and some acetone to dissolve the paint that is often sealing the nuts in place. I use an old viewfinder cover plate with the front part cut off so I can adjust while looking through the finder, and it's hard to see without the cover on.

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