Originally posted by UncleVanya Off the top of my head I can't recall much but the compare tool on the forum will help. The things that come to mind for me: wireless P-TTL, continuous shooting (k50 is faster on high speed and buffers more pictures, and on low speed it can shoot continuously without the buffer ever filling up until the sd card is full. Also composition adjustment using the shake reduction is offered in the k50 but not the ks2. There are advantages the ks2 has as well, check the compare tool.
just checked the comparison between the K-3 II - K-S2 - K-50, K-3 II and K-50 do support Composition Adjustment, K-S2 doesnt. (feeling disappointed, they didnt need extra hardware to put in this feature, does Pentax have a history of releasing firmware wherein they enable some disabled feature in future, in that case it might be a possibility with K-S2??)
Another interesting thing that I saw:
Flash Function:
K-3 II : Auto discharge*, On (leading curtain sync)*, Redeye reduction*, Slow-speed sync*, Trailing curtain sync*, High-speed sync*, Manual*, Wireless**, Contrast control**
* Requires an external flash
** Requires two (or more) external flashes
K-S2 : Auto discharge, On (leading curtain sync), Redeye reduction, Slow-speed sync, Trailing curtain sync, High-speed sync*, Manual,
Wireless*, Contrast control* * Available when combined with external flash
K-50 : Auto discharge, On (leading curtain sync), Redeye reduction, Slow-speed sync, Trailing curtain sync, High-speed sync*, Manual*, Wireless*, Contrast control* * Available when combined with external flash
How come for K-S2 the Wireless flash feature is shown?? and that too it's not mentioned 2 flashes, same as that of K-50. Is this a typo??
edit:
Another difference between the K-S2 and K-50 is that K-50 has the HyP option in it's mode dial, K-S2 doesnt, (K-3 II also has a HyM mode - Hyper manual) what are the advantages of it?? does the K-S2 compensate for this functionality in some other way??
Pentax K-3 II vs. Pentax K-S2 vs. Pentax K-50 - Pentax Camera Comparison - PentaxForums.com