The cheapo effective 1,650 mm 5.6 tele (Q + adapter + Tamron 70-300 and other lenses)

Started Dec 3, 2012 | Discussions thread
13thBagel
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Re: The cheapo effective 1,650 mm 5.6 tele (Q + adapter + Tamron 70-300 and other lenses)
In reply to Daniel Lauring, Dec 4, 2012

Daniel Lauring wrote:

Isn't the diffraction limit, for the Q, actually about F2.5? That is where you start to lose resolution based on the formulas I've seen.

Over in Pentax Forums there's a recent thread that explores this subject. In theory, you are correct. On the other hand, in practice the best balance between resolution and sharpness was found to be around f/4 and f/5.6 depending on the lens tested.

An interesting read...

The OP is "hnikesch" ...worth the effort to find.

Cheers...M

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Pentax Q7 Pentax K-3 Pentax smc DA* 300mm F4.0 ED (IF) SDM HD Pentax DA AF 1.4X AW Rear Converter
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