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A buddy of mine happened to have the HoodEye from Hoodman which is a soft eyepiece that helps block out intermittent light between the viewfinder and our eyes. I was pretty impressed with it and went onto the website to order one for my K-r but alas, they only have made the HoodEye for Canon and Nikon cameras. For $20, this seems like an excellent investment and was such a tease because I do wear glasses and I do have issues with errant light distracting me when composing, let alone focusing manually. It is such a simple device but could be invaluable in certain situations.
I did call to inquire and the representative asked me to list my camera and my email and that they'd keep me posted. Of course, I prodded on for more and she mentioned that they were considering making the Hoodeye for Sony cameras next but appreciated the feedback. As much as I love my K-r. I wish there was more aftermarket support.
This is where the rest of you come in. Do not just bombard or harass, but I can't be only K-r or K-5 user with this issue. If you'd like one, might I suggest calling them up and adding your name to the list and showing Hoodman that Pentax users would also like to use their products when given the opportunity.