Originally posted by Rbonn I just bought a 645N ii and the small eye cup it came with is not giving keeping enough ambient light from getting in the way of composition. I have a bigger eye cup on my 645 yet it just doesnt seem to unscrew. Two questions: are they transferable and if so, how do I remove the larger cup from the 645.
Look at page 27 in the owner's manual. It shows how you should be able to unscrew the eyecup. You may need to carefully protect the viewfinder eyepiece then spray WD-40 to loosen the ring.
https://www.cameramanuals.org/pentax_pdf/pentax_645_nii.pdf
I am 99% certain the same larger eye cup was used on the 645, 645N, and 645Nii.