Are you smarter than a 55-300? For this Bigmos, the answer is no.

Started 5 months ago | Discussions thread
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results of indoor testing
In reply to paulkienitz, 5 months ago

I did a set of indoor tests comparing the new Bigmos to the old DA 55-300. I managed a distance of 17 feet (5m) to my favorite test target, a dollar bill. I used a tripod, remote trigger with 3 second delay, no SR, and live view autofocus. Here's a grid of results:

To summarize my findings:

  • The Bigmos consistently underexposed.
  • 500mm is absolutely terrible regardless of aperture. There's more real resolution at 400.
  • 400mm in turn may not really be seeing any more than at 300.
  • At 300mm it looks better than the DA for the wider apertures, but the shortcomings of the DA at 300 look to me like a focus error, not an optical flaw.
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"A good photograph is knowing where to stand." -- Ansel

 paulkienitz's gear list:paulkienitz's gear list
Pentax Q Pentax K-3 Pentax smc DA 55-300mm F4.0-5.8 ED Pentax smc DA* 300mm F4.0 ED (IF) SDM Samyang 8mm F3.5 Aspherical IF MC Fisheye +3 more
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