Originally posted by Tony3d I really don't like to change lenses for fear of getting dust on the sensor.
Even when my superzoom was my only lens I still somehow got dust on the sensor!
With all the tech innovations in MILCs, it's suprising no manufacturer has come up with a hardware solution to protect the chamber from dust. Other than this:
Keeping Your Camera's Digital Sensor Clean - Photo Blog - Niebrugge Images Originally posted by Tony3d Thought that maybe there was a miricle lens out there I didn't hear about LOL!
It's worth asking. Superzooms have a bad name because the early 28-300 ones were pretty ordinary. The Tamron 18-250 (and the later 18-270, each subsequently re-badged by Pentax) were quite a leap in quality at the time (from about 2007). (Photozone said, "the resolution characteristic is fairly amazing regarding the extreme zoom range".) Like a lot of consumer zooms, superzooms sacrifice wide apertures and corner sharpness (and generally even some centre sharpness at the long end) on the basis that they are less of a priority for most regular photographers than centre sharpness and versatility. For a traveller who wants versatility and reach, and mainly shoots outdoors at f8, they are a good option.
The latest Tamron 16-300 (not in K-mount) and Sigma 18-300 seem to be pushing the limits. LensTip is generally scathing about superzooms but they were reasonably kind about the latest Sigma (tested on a Nikon):
Sigma C 18-300 mm f/3.5-6.3 DC MACRO OS HSM review - Introduction - LensTip.com
Still the pattern of being weakest at the long end and soft in the corners (even when stopped down, at the long end) continues.