I've been shooting film on a Canon AE-1 Program with a Tamron 90mm Macro SP lens. Until recently, the lens worked perfectly, but all of a sudden it won't focus farther than 10ft. To my knowledge it hasn't been dropped.

This is not my lens, and i have it checked out through school. Is there a possibility for a self- repair?

  • 3
    \$\begingroup\$ Since it belongs to the school, if it needs repair I would let them make that decision. \$\endgroup\$
    – Michael C
    Mar 29, 2014 at 18:06

1 Answer 1


There's a focus limiting switch - so that when you're doing macro work, it won't hunt through the whole range. Look over the lens and find the switch and turn it off.

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  • \$\begingroup\$ This link reviews the original Tamron SP 90mm f/2.8 Macro and discusses the focus limiting switch. cameralabs.com/forum/viewtopic.php?t=17673 \$\endgroup\$
    – Michael C
    Mar 29, 2014 at 18:46
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    \$\begingroup\$ Since he is using it on a Canon AE-1P I would assume he is using the original SP 90mm f/2.8 Macro, not the more current Di lens. \$\endgroup\$
    – Michael C
    Mar 29, 2014 at 18:50
  • \$\begingroup\$ Right, its still a practically identically looking switch. \$\endgroup\$
    – rfusca
    Mar 29, 2014 at 18:51
  • \$\begingroup\$ @MichaelClark - you were right about it being the original lens, and there is no limiting switch. After repairing a Canon FD 35-105 f/3.5-4.5, my best guess is that a screw might have come loose, or something along the lines. \$\endgroup\$
    – Alex Volpe
    Mar 29, 2014 at 19:47

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