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Forum: Pentax SLR Lens Discussion 03-13-2018, 07:20 AM  
Effects of 2x converter
Posted By marcusBMG
Replies: 21
Views: 1,830
If the light is good my K5 autofocusses at f8+ (DAL 55-300mm f3.5-5.8 + 1.4x tc), also depends somewhat on subject.
Forum: Pentax SLR Lens Discussion 03-13-2018, 07:09 AM  
Effects of 2x converter
Posted By marcusBMG
Replies: 21
Views: 1,830
Bob Atkins has a couple of good pages thoroughly discussing tc's:

Teleconverters (Multipliers) - how well do they work?
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