Originally posted by phoebus I have Sigma 10-20 3.5 and Pentax DA HD 1.4x. When I get home I'll try it and post pictures. Don't expect too good a result as I can confirm both DA*200 and DFA 150-450 both vignette severely with the 1.4 TC. However, the wide-angle may have a better ray angle through the TC and get less vignetting. Proof is in the photo! TBC...
Below is Sigma 10-20 F3.5 at 16mm without any TC, no corrections - straight export to jpg from raw in Lightroom:
That's interesting.. thanks for that. It looks like the corners are really poor... the vignetting I can handle (as it isn't really that bad to me) but the softness is something I cannot handle. That's too bad.
I appreciate the example!!
---------- Post added 02-28-17 at 08:53 PM ----------
Originally posted by Sweets I hope we see a 1.5x converter from Pentax/Ricoh in the near future; WR included��������
A 1.4/1.5x AW converter would be nice for Full Frame to use on K-1. I can only imagine the price it would cost considering the outrageous markup on the DA 1.4x for crop.
Considering how constrained Ricoh Imaging seems to be (likely as a result of Ricoh corporate), I suspect if they do launch one it wont be for another couple of years.
The issue with converters is people buy them to extend the range (and life) of their current (already paid for) lenses. And Pentax is in the situation of wanting (needing?) to sell us brand new lenses.