On 2016-04-29 14:52 , Larry Colen wrote:
What are the options for long focal length macros? How are they optically?
Are there any teleconverters that do well? Or, am I just better off
cropping tighter?
this 300mm mirror lens has 0.5X maximum magnification and theoretically
exists in k-mount:
<https://www.camera-warehouse.com.au/samyang-300mm-mirror-f6.3-ed-umc-cs-pentax-k-aps-c-lens>
i got the max magnification from sources listing the lens for other mounts;
it may also be available from Rokinon, and Tokina seems to have a 300mm
mirror with the same magnification, though i can't find anything about
K-mount; at a fixed f/6.3 it will have a very shallow depth of field, and
i'm not sure what to expect when stacking images with "ring" bokeh
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