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Message: <blockquote data-quote="gcole" data-source="post: 3554598" data-attributes="member: 29223"><p>Hi .. I found the ES68/24mm eye relief worked well with my glasses, giving me no problems when using it with the rubber eye guard folded down. I saw no pin cushion/distortion. I like the eye piece on 26mm the best. With the 1mm or so more eye relief the rubber eye guard on the 26mm seemed to sit closer to the inside of the ocular lens with the rim of the ocular being shorter in height making it easier to use with my glasses on. My eyeglasses & facial features work well with the 26mm. Others may not have the same experience. This is where ... Try before you Buy, comes into play. Optically I found the 26mm gave a better view to my eyes than the 24mm 68 degree eyepiece. Maybe its the 62 degree design over the 68 with the 26mm giving 15x power on the Pentax compared to the slightly over 16x power with the 24mm eyepiece. Maybe some other member here might have more insight on how different ocular designs might play a part.</p></blockquote><p></p>