That sounds right Peter ...We just need clarification on what is meant by "normal flash" on the K70 Andrew.

If you mean P-TTL, then we would expect a slave set to SL2 to be triggered, but by the pre-flash, and therefore not sync with the exposure.

Most of this seems to point towards the AF-360 not getting properly into SL2 mode for some reason ...

Andrew, it sounds like you have done everything correctly to be able to say "in theory it should work" ....I agree that it should, as in Manual mode the K70 flash will not emit a pre-flash, therefore basic syncing on the main flash should occur.

The only two things to double check are that the SL2 mode is definitely being set properly (I know it's a bit of a strange process. .... And is there an indication to confirm SL2 is set?). The other thing is the line of sight thing, to be sure the slave flash sensor can " see" the light coming from the camera.

You've got a Yongnuo also ..... It would be worth putting that onto the K70 and checking if the AF-360 will respond in SL2 mode to the Yongnuo firing.And since the Yongnuo works ok as a slave triggered by the K70 flash in manual, try a "daisy chain" and add the AF-360 also in SL2 mode, but place it where it can only detect light from the Yongnuo.... In theory all three flashes should sync correctly.

I find that the HDR version looks more realistic, at least in dynamic range terms, as I feel it reproduces the natural DR compression that our eyes/brain would perceive after having adjusted to the dim light level. Perhaps a small overall reduction in brightness would add more mood ......?

The 2nd one looks to me like the result of a camera sensor that can't cope with the DR in the scene.

https://www.pentaxforums.com/content/uploads/files/1/p1634/Supplement%20to%20the%202nd%20Edition%20of%20the%20Pentax%20Digital%20Camera%20Flash%20Lighting%20System%2C%20June%202017.pdf

Phil, there's a link to my "Supplement" pdf from my "Pentax Flash Guides" .... This has a detailed section on off-camera technologies and specific products within each category that are compatible with Pentax DSLRs. Within the "Radio Manual category it details the Yongnuo flash and trigger models needed.

I do agree with Peter and Chris for a bit of extra money the Cactus offering provides some exciting additional features, however for basic manual control over multiple flashes from the camera, then the Yongnuos still offer good value.

I like the wide angle and low horizon which showcase the drama going on perfectly! Good exposure too, all adds up to a great photo.

A dramatic image with great leading lines and interesting foreground ..... And it's even got a great subject as well! A very worthy photo for recognition and publication, well done.

That reminds me of the name of a car sales firm I pass a lot in South Croydon ..... ‘Ancaster Motors’ ...... it is always impossible for me to stop imagining that there’s not been an L that’s dropped off at the start of their sign .

Yes, thanks for the info Barrie .... This will answer many Pentax flash users calls, and surely silence those who talk about having to jump ship in order to mix with the big boys!

Cactus have also announced their own new lithium battery studio strobe, with built in radio receiver, fully integrated within the V6II system. The choices now available for serious radio trigger work with Pentax DSLRs are looking ever better.

Well he did say it only had a tiny bit of PF ....!

I don't think that peoples collections of old K, M and A types are really relevant in the context of wishlists of what Ricoh will make new for us going ahead. In fact, surely the typical die hard owner of quality old Pentax primes is rather unlikely to spend money now on new, and rather expensive, D FA primes (when they're available) ?

Algi is spot on that they were aware of the demand for a FF camera body in which to use all the legacy glass, and most of that clamour was about the quality primed .... The Limiteds in particular but also the better 'faster' 50mm ones, perhaps the macros also.

So I don't think Ricoh were expecting to sell many new primes to that group. They released the zooms to appeal both to existing Pentax users who would trade in their DA zooms and 'upgrade' to D FA. Also they needed serious looking offerings that were competitive against the Canikon equivilents to ensure the whole brand package could appeal to new starters and those looking to move over to Pentax.

There was little apparent demand from owners of older legacy zooms for FF ....a typical owner of something like, say, the FA20-35, was not saying " I need a FF Digital camera because my 20-35 will be great on it .... No, they were thinking more that it was lucky they had a 20-35 because it will save them money!