Question about Nikon D90 Digital Camera with 18-105mm lens

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I cleaned lenses and mirror with optical lens cleaner. After this, when viewing through the view finder the view is very dark. Indoors I can hardly see the image I am trying to photograph. Please suggest what the problem could be

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The mirror on a DSLR should never be touched except by a qualified service technician! Not only do you risk removing the finish ( unlike a regular mirror, it is on the front of the glass, not the back) but the delicate placement of the mirror and it's lifting mechanism can be misaligned by any pressure.

Posted on Oct 12, 2010

  • ahtnamas_xox
    ahtnamas_xox Dec 28, 2012

    what should he do?

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Posted on Jan 02, 2017

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I have quite a lot of fungus inside my sigma mirror ultra lens, the front lenses were easy to get out and polish but I am concerned about dismantling the smaller rear lenses. Are there any complications to...


Holy Smokes, well if I were you right now I'd put it back together and send it to Sigma for repair cause you dismantle a lens like that there is no way you are going to align those lens elements without the proper equipment.

Using anything more then lens cleaner for camera optics will in fact remove the coating from the lens.

What you have isn't like the lenses from a "View" camera where it was possible to remove one lens group and replace with another but, those lenses were made and used 70 years ago.

Lens technology has changed a bit since then.

I had a manual focus Nikon F2.8 lens one time that had a coating separation on the front element that caused some wicked flare. I took eye glass cleaner and Windex to it to remove the rest of the coating so I could continue the shoot. I then sent the lens to Nikon for repair.

Best of luck with that one

Apr 27, 2011 | Cameras

1 Answer

Images are blurry through my view finder, my mirror, lense and view window are clean. whats going on?


There is a small knob or lever to adjust the viewfinder lens dioptric focus to suit your eye. It probably got turned by mistake to a setting unsuitable for your vision. If you wear contacts make sure you have them on before you do the adjustment. Glasses usually block the view but it is up to you whether you wish to make the viewfinder adjustment with them on or off. See page 38 here:
www.cleaningdigitalcameras.com/pdf/EOS20DIM-EN.pdf

Nov 30, 2010 | Canon EOS-20D Body only Digital Camera

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Can't see anything through the view finder, i've


The mirror in the lens throat has locked in the up position. Mirror lockup can usually be cured by replacing the batteries.

May 10, 2010 | Pentax ZX-7 QD 35mm SLR Camera

1 Answer

WHEN I LOOK THE THE VIEW FINDER IT IS VERY DARK.


mirror is struck to ground glass/failure of the mirror mechnism

Mar 02, 2010 | Minolta XG-A 35mm SLR Camera

3 Answers

Mismatch between viewfinder and photograph


Is your camera an SLR, if so then your mirror might be at the wrong angle, if that is the case then you need to have a specialist tilt the mirror, if your camera is not a SLR then this is a common problem when taking pictures from a short distance away from your subject, as the view finder is above the lense so what appears centered in the view inder will be much higher up in the lense, there are two ways to fix this, one is to use the LCD, or most cameras have correction marks in the view finder,and these show where the actual edges of what the lense sees are, use the correction marks.

Jul 23, 2009 | Sony Alpha DSLR-A200K Digital Camera

1 Answer

Dark View Finder?


The short answer is check the aperture. If the aperture is to high (it's using a big F Stop) it will slow down the shutter speed.

Jun 27, 2009 | Sigma Cameras

1 Answer

Dark view in view finder


Sounds like a lens diaphragm problem ( lens stays closed down to F16 and that is why you have a dark viewfinder ). Remove lens and see if you can activate the aperture mechanism via the activator which protrudes from the rear of the lens. You should get nice and brisk action from the aperture . If the movement is sluggish or the lens stays fully closed then your lens needs attention.

Sep 15, 2007 | Nikon N75 35mm SLR Camera

2 Answers

Viewfinder Obstruction


If the dust/dirt is visible in the finder, it is in one of three locations: - if very sharp, it is on the "grind" side of the viewing screen, which, unfortunately for cleaning ease [unless the screen is user-removeable], is often the upper side of the screen in newer cameras. - if fairly sharp, it is on the non-"grind" side of the screen, and it may be possible to remove it with a VERY soft (very clean!) small brush or a VERY gentle blowing with a hand syringe-type blower (blowing hard into a VF area just about guarantees that dust will be blown in). - if very soft-looking, it is on the underside surface of the pentaprism (being able to clean the VF area without a repair is an excellent arguement for having the interchangeable-screen feature...). Prevention is the best way - never leave the body cavity uncovered (except briefly, when changing lenses); never change lenses in a windy area; keep the rear area of the lens clean; get in the habit of facing the open camera downward while changing lenses; NEVER blow into the body cavity (unless you know what you are doing, the mirror is up, or the screen is removeable). Hope This Helps

Oct 27, 2005 | Nikon Coolpix 3200 Digital Camera

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