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Occasional Contributor
Posts: 14
Registered: ‎12-26-2019

Canon 600mm f4L IS dust inside elements

Hey guys! I bought a Canon 600mm f4 IS on eBay and it arrived today. The lens is in excellent condition, not scratches, it’s in mint condition externally. But, inside there is like dust, it can be noticeable when you put it directly to the light. I tried to request a maintenance with Canon Service center but they don’t offer service to those lenses (version 1). So, anyone know what can I do? Or do you know a respectable center like Canon Service to performance this maintanance?
Thoughts!

And regards....
Reputable Contributor
Posts: 664
Registered: ‎10-18-2016

Re: Canon 600mm f4L IS dust inside elements

[ Edited ]

Take a series of photos with the lens at different apertures against a plain white surface.  Look carefully at the images and see if you can observe any noticeable dust marks.  I would be surprised if you see anything.   The lens has a focal length of 600mm, so back where the elements are it is very likely to be be massively out of focus. and thus invisible to the sensor.

 

If you DO see dust marks make sure your sensor is clean, or try a different lens and see if you ge the marks in the same place - that would suggest the sensor has dust on it, which WILL be noticeable.

cheers Trevor
"All the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
Esteemed Contributor
Posts: 3,702
Registered: ‎02-17-2016

Re: Canon 600mm f4L IS dust inside elements

Don't worry about it:

https://www.lensrentals.com/blog/2019/04/removing-fly-from-weather-sealed-canon-70-200mm/

 

"So, this seems like a good time to do a blog post showing that 1) this big-ass fly had almost no effect on image quality, so that little dust speck you’re frantic about sure doesn’t, and 2) getting flies (or dust) out of a lens is a lengthy and difficult process that takes a long time."

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VIP
Posts: 12,081
Registered: ‎12-07-2012

Re: Canon 600mm f4L IS dust inside elements

"... there is like dust, it can be noticeable when you put it directly to the light."

 

Yes you do need to test it out.  I doubt the dust will show up because it is not in focus inside the lens.  However, if it is severe on the lens elements, enough it will block some light and that isn't good.

Midwest Camera Repair will service it.

EOS 1DX and 1D Mk IV and several lenses!
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