Compare real-world fit, not spreadsheet noise.
Pick up to four products and tune the verdict around travel, hybrid work, wildlife, resale safety or pure value. GearAtlas weighs carry size, ecosystem cost, market timing and ownership risk in one calm decision surface.
Visual
Estimated
Ranked
Pentax K-1 Mark II
Full-frame / 620g
Pentax K-3 Mark III
APS-C / 620g
Workflow lens
Pentax K-3 Mark III is nearly tied for travel and everyday carry.
Pentax K-3 Mark III leads on AF confidence by 8 points.
Camera size studio
Relative body dimensions
Front, back and top views are drawn from external dimensions so the size relationship stays proportional.
View
Mode
Pentax K-1 Mark II
Front view / 132 x 92mm
132 x 92 x 72mm
Pentax K-3 Mark III
Front view / 132 x 92mm
132 x 92 x 72mm
Width
Height
Depth
Weight
External dimensions and carry delta
Pentax K-1 Mark II and Pentax K-3 Mark III share the same external size profile in the current data model.
Pentax K-1 Mark II
Pentax K-3 Mark III
Class benchmarks
Sensor comparison
Sensor size to scale
×1 crop
×1.53 crop
Full-frame captures ~2.4× the sensor area of APS-C, a real low-light and depth-of-field edge.
Decision matrix
Scores tuned for travel
Highlighted specs
Only specs that change the decision
Sensor
36.4MP full-frame
Sensor
25.7MP APS-C
Feature
Pixel-shift
Viewfinder
Optical pentaprism
Community comparison
Owner consensus · not specsCommunity comparison appears once owners vote on these products — 6 more votes across the pair will unlock it.