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Dust spots
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Feb 26, 2021 19:47:59   #
GoofyNewfie Loc: Kansas City
 
Mileagemaker wrote:
Picture attached shows several dark dust spots. Have to enlarge it to see dust spots. Tried everything from rocket blaster to wet wipes. Tried at least 6 times. It is better but dark dust spots still show. Using a 18-300 Nikor lens with a Z-50 Mirrorless.


You need to check the "Store Original" box so we have something to enlarge.

( I shoot a white sheet of paper, a blank wall or a blank white computer screen to check my sensor.
Can do it anytime of day, doesn't matter how long the shutter is open because the sensor and dust is locked together...and no birds.)

I am curious to see what is recommended to use with mirrorless cameras that have IBIS.
Possibly looking at a Nikon Z6 next.

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Feb 26, 2021 19:55:24   #
CHG_CANON Loc: the Windy City
 
Mileagemaker wrote:
Picture attached shows several dark dust spots. Have to enlarge it to see dust spots. Tried everything from rocket blaster to wet wipes. Tried at least 6 times. It is better but dark dust spots still show. Using a 18-300 Nikor lens with a Z-50 Mirrorless.

Thank you for the continued effort to post an example. But, please create a new <reply> and click the box 'store original' when posting the attachment. Thanks.



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Feb 26, 2021 20:40:15   #
Mileagemaker Loc: Jackson NJ
 
hopefully this will do it. This picture is fine until I go smaller than F13. After F13 you will see dust spots. I am using a Nikor 18-300 mm with a Nikon Z-50 Mirrorless. Another comment was to take a picture of a white wall which I did. Again, it was shot at 5.6 since it was indoors and it showed no spots. Every picture I have taken is perfect until I go smaller than f13. I am shooting at 18mm on a cropped camera. I have a magnifying glass and I do not see any contamination on the lens or sensor.


(Download)

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Feb 26, 2021 20:49:16   #
GoofyNewfie Loc: Kansas City
 
Mileagemaker wrote:
....Another comment was to take a picture of a white wall which I did. Again, it was shot at 5.6 since it was indoors and it showed no spots.


You can shoot inside at whatever shutter setting you need to test the smaller apertures.
1/2 sec, 1 sec... 3 seconds. Won’t matter., just just get the exposure right, or actually setting it to over expose by a stop or a bit more will help. You don't need to worry about camera shake because as I said above, the dust and sensor are locked together. Don’t even try to hold it steady. Don’t crank up the ISO either. What is important is the aperture. Stop it down The dust shows up more with smaller apertures because the light coming through the lens is more of a point source and will give you more defined shadows.

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Feb 26, 2021 21:02:22   #
CHG_CANON Loc: the Windy City
 
Mileagemaker wrote:
hopefully this will do it. This picture is fine until I go smaller than F13. After F13 you will see dust spots. I am using a Nikor 18-300 mm with a Nikon Z-50 Mirrorless. Another comment was to take a picture of a white wall which I did. Again, it was shot at 5.6 since it was indoors and it showed no spots. Every picture I have taken is perfect until I go smaller than f13. I am shooting at 18mm on a cropped camera. I have a magnifying glass and I do not see any contamination on the lens or sensor.
hopefully this will do it. This picture is fine un... (show quote)


I went through your attachment and highlighted all the sensor dust I could find. Some are rather subtle and can be seen only when moving the image up n down. You'll find the dust easier to verify during cleaning by picking a brighter 'clean' background, like the ceiling of your room with lights on or taping a white piece of paper to the wall under a lamp.

Like the doctor says when you say it hurts when you do this, don't shoot at apertures smaller than f/11. Really, there's rarely a valid need in digital photography to go smaller than f/11 to f/13.

For cleaning, the dust is hard to see, even with a magnifying glass. Just use your blower and test. When using the blower, hold the camera fasting down and blow up into the body, without touching the sensor. Consider the more powerful Giotto Rocket-air as your blower tool. Give several strong blasts, restore the lens and capture a few test images at f/13. Repeat until the test images are clean.


(Download)

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Oct 8, 2021 09:19:14   #
Thomas902 Loc: Washington DC
 
Dust spots "...Using a Nikon Z-50 with a Nikor 18-300 lens..." Mileagemaker your issue with "sensor dust" is very likely entirely a result of using the AF-S 18-300mm f/3.5-5.6 (or 6.3) DX lens. This lens is a horrific "Pumper" pulling/pushing a huge volume of air into your system (i.e. camera body).

Mileagemaker there are compelling reasons commercial shooters use IF optics (Internal Focusing). Zero air in or out of the lens/body cavity. Experience is a brutal teacher... I finally sold my AF-S 18-300mm f/3.5-5.6 VR DX lens. While I initially thought it was awesome... so naive... If you don't want to use primes for goodness sake please pony up for an IF zoom lens.

Lots of seriously good, actually great advice in this thread by those who have "been there done that".
Please take this aggregate combined wisdom seriously... It is priceless... And a big shout out to amfoto1, thank you for your stellar guidance.

Final thoughts: Pumpers should be avoided especially with mirrorless.
If you insist on Zoom Optics then go for IR and no greater than 3x

That said primes simply can't be matched (contrary to vendors marketing hype).
They have the least amount of issues, and likely far fewer elements to degrade IQ.
If you stay in this game in time this reality will ultimately sink in.

And please consider sending your Z50 to Nikon Service for "Wet Cleaning" which btw is not an End User task for the Z series with IBIS, however with the Z50, there is no IBIS that said I wouldn't risk damaging the very delicate sensor.

Hope this helps Mileagemaker
All the best on your photographic journey.

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Oct 8, 2021 12:41:32   #
Mileagemaker Loc: Jackson NJ
 
Thank you for the reply.

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