Pentax 67 TTL Prism - cannot remove diopter eyepiece

glass · 12-01-2018, 04:17 PM

I have the Pentax TTL prism viewfinder.

I cannot turn the knurled ring that holds the diopter eyepiece in place. I understand from the manual that it is supposed to unscrew anti-clockwise, but mine is stuck fast. Any tips on how to remove this? Thanks.

Silent Street · 12-01-2018, 04:38 PM

Give the ring a squirt of WD-40 and let this penetrate for a few minutes.
Then unscrew. Afterward, wash the ring and lens thoroughly in soapy water and dry.

torashi · 12-01-2018, 04:48 PM

If it's stuck too hard, try leaving the finder in a warm (~37°C/~100°F) spot for a longer time, then putting something really cold against the knurled ring and using something out of rubber (needs good traction) to unscrew it.

Silent Street · 12-01-2018, 07:58 PM

I would be very concerned if, for some well-intentioned reason, the ring was secured with Loctite - uncommon but also not unheard of! The danger is that the use of force can easily strip the soft aluminium threads on the prism and/or the ring. I would try the least aggressive attempt at removal before anything else.

12-01-2018, 04:17 PM	#1
glass Junior Member Join Date: Mar 2016 Posts: 37	Pentax 67 TTL Prism - cannot remove diopter eyepiece I have the Pentax TTL prism viewfinder. I cannot turn the knurled ring that holds the diopter eyepiece in place. I understand from the manual that it is supposed to unscrew anti-clockwise, but mine is stuck fast. Any tips on how to remove this? Thanks.

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12-01-2018, 04:38 PM	#2
Silent Street Pentaxian Join Date: Nov 2011 Location: Ross/Alice Springs NT May-Jul Photos: Albums Posts: 729	Give the ring a squirt of WD-40 and let this penetrate for a few minutes. Then unscrew. Afterward, wash the ring and lens thoroughly in soapy water and dry.

12-01-2018, 04:48 PM	#3
torashi Pentaxian Join Date: Sep 2017 Location: Medellín Posts: 685	If it's stuck too hard, try leaving the finder in a warm (~37°C/~100°F) spot for a longer time, then putting something really cold against the knurled ring and using something out of rubber (needs good traction) to unscrew it.

12-01-2018, 07:58 PM	#4
Silent Street Pentaxian Join Date: Nov 2011 Location: Ross/Alice Springs NT May-Jul Photos: Albums Posts: 729	I would be very concerned if, for some well-intentioned reason, the ring was secured with Loctite - uncommon but also not unheard of! The danger is that the use of force can easily strip the soft aluminium threads on the prism and/or the ring. I would try the least aggressive attempt at removal before anything else.

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