Lens Compatibility

Started Feb 8, 2014 | Questions
rishi123 New Member • Posts: 1
Lens Compatibility

I have Nikon D70s Dslr. I bought sigma 18-200mm f3.5-6.3 Non OS lens. When i took photo half portion of Photographs is dark.(Black). I do not understand this. Please, give me proper guidelines.

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Nikon D70s
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pixelless Contributing Member • Posts: 612
Re: Lens Compatibility

Unless something is wrong with the shutter curtain, and you are certain it is the lens (doesn´t happen with other lenses), it could be aperture blades stuck or one of the elements inside got loose/misaligned.

Parry Johnson Senior Member • Posts: 1,083
Re: Lens Compatibility
1

rishi123 wrote:

I have Nikon D70s Dslr. I bought sigma 18-200mm f3.5-6.3 Non OS lens. When i took photo half portion of Photographs is dark.(Black). I do not understand this. Please, give me proper guidelines.

This sounds like a flash sync problem.  Even though other Nikons generally sync at 1/250 second, the D70s can synchronize with a flash at speeds up to 1/500 sec, but if you shot at, say, 1/1000 sec, then the focal plane shutter wasn't completely open when the flash fired.  Slower speeds should be no problem.

Check the EXIF data for your problem pictures.  If you were using a flash and the shutter speed was high, your problem is solved.  Otherwise, it's something else.

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Parry Johnson Senior Member • Posts: 1,083
Re: Lens Compatibility

pixelless wrote:

Unless something is wrong with the shutter curtain, and you are certain it is the lens (doesn´t happen with other lenses), it could be aperture blades stuck or one of the elements inside got loose/misaligned.

A stuck aperture blade would only darken an uneven part of a picture, and then you'd also see a transitional area, especially at larger apertures.  With modern cameras and lenses with electronic contacts, you'll probably get an error message, as the shutter won't fire unless the aperture is fully closed to the set value.

A misaligned lens will be noticeable by severe distortion or uneven focusing.  Of course, if you hear the sound of broken glass or Michael Bolton, you know you have a serious problem!

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eths
eths Contributing Member • Posts: 775
Re: Lens Compatibility
1

Just off the top of my head...

Using a flash?

1) Could be a shadow caused by the lens?

2) Shutter speed too high for flash syncing.

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sillyconguru Veteran Member • Posts: 3,057
Re: Lens Compatibility

I doubt that it this a flash sync speed issue as the D70/D70s can sync up to 1/4000 due to it's interline CCD (the physical shutter only has a maximum speed of about 1/60). I'd suspect that the shutter curtains are not opening properly, the mirror isn't raising fully, or the built-in flash is being used and the lens is blocking the light.

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