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Forum: Troubleshooting and Beginner Help
05-17-2018, 05:00 AM
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My Tamron 17-50 is very good at showing dust!
Back story. I normally have my DA 18-135 mounted as a walkabout lens, so this is normally on when I do a dust alert check.
I recently got a K-3ii as the K-3 is getting a bit long in the tooth, and the 18-135 was on that body.
The Tamron was on the K-3 and I did a dust alert check at 50mm. Several bunnies.
Put the DA 18-135 on and repeated at 135. No bunnies.
Back to Tamron. Bunnies still there. Tried with Sigma 17-70 at 70 and OK.
All dust alerts stated f16 as aperture.
No done any scientific tests, but I can presume is that the Tamron actually has a smaller aperture than is recorded, and that is more prone to showing dust.
Ken
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