david_smigelskis Posted June 17, 2011 Share Posted June 17, 2011 <p>I have been using a film plane shutter speed tester since the mid-70s. I was recently given a Nikon N90. It seems that it is not possible to fire the shutter when the camera back is open. I appreciate that this is meant to be a safety feature but I can not consequently use my tester in the ordinary way. This is not true of the N70, the other Nikon I received. But there must be a "trick" that allows repair people to test the N90 shutter speeds. Does anyone know what it is that would allow me to fire the N90 shutter with the back open?</p> Link to comment Share on other sites More sharing options...
hans_janssen Posted June 17, 2011 Share Posted June 17, 2011 <p>On my F90 there is a little switch in the camera located in the edge of the compartment, just under the most right silver bar. I think that is the door sensor.</p> Link to comment Share on other sites More sharing options...
david_smigelskis Posted June 17, 2011 Author Share Posted June 17, 2011 <p>Problem solved. Thank you</p> Link to comment Share on other sites More sharing options...
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