Results 1 to 6 of 6

Thread: How to determine mirror mis-alignment?

  1. #1

    Default How to determine mirror mis-alignment?

    How severe must be the mis-alignment be to be considered an issue? I noticed my dslr have a 2mm bias at the left compared to the right. What i did was to photograph a ruler(on my monitor) and aligning a centimetre mark to the left and right border of my VF. Photo shows 2mm more tha the right's.I.e 15cm and 29cm comes out as 14.6cm and 29.2cm

    Blame me for being paranoid, but this was because i did a cotton bud delicate cleaning on my mirror, and the next cleaning on the focusing screen almost went awry when the cotton bud apparently caught on the black rectangle sponge thing! Thank goodness managed to remove it but just want to make sure mirror's fine.
    Last edited by eosdigital; 15th September 2008 at 12:20 AM.
    Canon EOS 30D , EF 17-40mm F4L USM , EF-S 55-250mm F/4-5.6 IS

  2. #2
    Senior Member
    Join Date
    Mar 2007
    Location
    Atlanta, GA
    Posts
    2,256

    Default Re: How to determine mirror mis-alignment?

    you sure it wasnt the focus screen that got shifted?
    chezburgr i can haz?

  3. #3

    Default Re: How to determine mirror mis-alignment?

    Quote Originally Posted by psychobiologist View Post
    you sure it wasnt the focus screen that got shifted?
    I wouldnt know. But is 2mm biasness a cause for alarm? Meaning i get 2mm more in my left than right from what i see
    Canon EOS 30D , EF 17-40mm F4L USM , EF-S 55-250mm F/4-5.6 IS

  4. #4
    Senior Member
    Join Date
    Mar 2007
    Location
    Atlanta, GA
    Posts
    2,256

    Default Re: How to determine mirror mis-alignment?

    not a cause for concern cuz most viewfinders are not 100% anyway
    chezburgr i can haz?

  5. #5

    Default Re: How to determine mirror mis-alignment?

    Quote Originally Posted by psychobiologist View Post
    not a cause for concern cuz most viewfinders are not 100% anyway
    Haha. Ok , to relieve myself completly...mirror misalignment means a extreme case where lets say a subject is centred in your VF but when snap...he/she becomes right of the photo

    thanks
    Canon EOS 30D , EF 17-40mm F4L USM , EF-S 55-250mm F/4-5.6 IS

  6. #6
    Senior Member
    Join Date
    Mar 2007
    Location
    Atlanta, GA
    Posts
    2,256

    Default Re: How to determine mirror mis-alignment?

    shouldnt be a problem. the 30D's a 95% viewfinder.

    i swap focus screens on my cam once in a while depending on what i need, and never had an alignment problem.

    and btw, if not needed, dont wipe/touch the focus screen. most of the time its just dust that can be blown away. if you get a finger print on your focus screen, its probably going to be not easy to clean it off. i think its probably the coating nature of focus screens. rough cleaning can scratch the screen easily.
    chezburgr i can haz?

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •