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Thread started 17 Nov 2006 (Friday) 07:53
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mirror & Q-tips need help

 
mantra
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Nov 18, 2006 05:23 as a reply to  @ post 2279577 |  #16

thanks Johnny Thunder

On a quick test with my 5D, I got the same readings on my wall (1/60 @f2.8 ISO3200) regardless of what metering mode I was in.

did u use the automatic or manual focus?


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canon 5d markII,24L & 24ts , 35L ,17-40L,24-70L,70-200 2.8ISL,50 1.4,85 1.4 , canon eos 3 ,eos 5 ,t90 , ae program and some very sweet fd lenses
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Nov 18, 2006 10:33 as a reply to  @ mantra's post |  #17

gjl711 wrote in post #2276391 (external link)
A front surface mirror is very fragile, but touching it very lightly with a q-tip is not going to wreck the mirror. The mirror itself is actually a bit more durable than many are making out as anyone who has owned a reflective telescope for any length of time can tell you. The damage is more likely to occur in that any pressure applied against the mirror will knock it out of alignment before it will remove the coating. If the dust is annoying, use the rocket blower so something similar, not canned gas. That usually knocks it off. If it’s still there, then try to live with it. It won affect you image quality. If it bugs you so much that you just have to get rid of it, don’t use a dry q-tip, use a micro-fiber cloth and use the lightest of touches you possible can just on the speck itself. Or, take it to a camera shop and let the gorilla behind the counter do it for you.:)

Agree. Don't worry you didn't damage anything. The worst you would have done with your methodwas to leave cotton fibers on the mirror. Just don't do it again. Got scared and learned a lesson.


7D MKII ■ 10-22 ■ 15-85 ■ 28-135 ■ Σ 50-150 ■ 70-200 f4L ■ 100-400L ■ 580EX II
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mantra
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Nov 18, 2006 12:01 |  #18

Jon wrote in post #2277218 (external link)
Do all 3 settings give you comparable exposure? That's why a uniform surface - to rule out differences in the different metering areas.

did u see my photos?:cry:

Eagle wrote in post #2280656 (external link)
Agree. Don't worry you didn't damage anything. The worst you would have done with your methodwas to leave cotton fibers on the mirror. Just don't do it again. Got scared and learned a lesson.

thanks , how are u sure i did not damage anything?:o


canon 5d markII,24L & 24ts , 35L ,17-40L,24-70L,70-200 2.8ISL,50 1.4,85 1.4 , canon eos 3 ,eos 5 ,t90 , ae program and some very sweet fd lenses
3 analogic Hasselblad and 2 anologic Mamiya

  
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Johnny ­ Thunder
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Nov 20, 2006 00:15 |  #19

hmm, 2 out of 3 tests show a slight variation when in Partail Metering mode. Doesnt look to be anything really serious, and certainly not anything to really worry about.

when I did my tests, I did them in Manual Focus, but did get the focus pretty close (probably right, but not enough contrast to lock on to, just a plain wall)

I wouldnt worry about it, probably wont even notice it during regular shooting

-Johnny


T2i gripped with kit lenshttp://75.126.234.18/f​orum/showthread.php?t=​400860 (external link)

  
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mirror & Q-tips need help
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