Nikon camera D300 mirror up/down shutter permanently up

If you turn the camera off and then back on and the mirror is up. The camera needs service.

@samanthas636
It's the aperture lever that has to be replaced and NIKON will do it at no cost to you.I just got mine back from NIKON's Melville Repair Center.They are great because they have backed their product and their service and people who work their are excellent!Kudos to NIKON!!!!

Hi jandklandry, Sounds as though the cushion the mirror hits on the up swing is tacky thus holding the mirror up. Maybe you can yourself fix it however, I would suggest sending it to Nikon for a complete CLA (Clean Lube Adjust). You have a nice camera allow Nikon to do it proud.

As long as it works, I wouldn't spend too much time worrying about it. In the future, learn to clean the sensor yourself. It's not difficult when you have the proper supplies. Just Google the words "how to clean a DSLR sensor" and you will find sites with pictures to teach you.

If you've pre-focussed by pressing the shutter button half-way and heard the beep, there is no shutter lag.

Check to see if somehow the "noise reduction" setting is on. This in effect takes two separate exposures on each shutter release, so it (sometimes) doubles the time the mirror is up. I'm not sure where it is in the menus on a D300.

Also, just a terminology point, but the "shutter" in this camera is a combination of the mirror (what we usually call the shutter) and the electronics which samples the sensor for a limited time. It's a little like the mechanical shutter on a film camera that was behind the mirror....back in the day when they made them from titanium.

The "so what" of this is that even if it sounds like it's not releasing as fast as it used to, the exposure can still be accurate if the electronics are sampling correctly. It's only when moving to slow exposures that the mirror speed/up time makes a difference.

are you using mirror lock-up or live-view feature?

Perhaps it is a focusing problem- try it on manual focus setting to see if the problem still persists...

send it back to NIkon..

This should make no difference the way the camera performs. I believe that it is the buffer for shooting in burst mode. Is it on all the time?

It should just flash every time when you half depress the shutter.

Hope this helps.

Drew