[Thanks once again everybody; I think it's cleared that the k30/k50/k500 do work the focus assist lights on flashes!
Quote: The Sigma has vertical red stripes for its assist light so you can actually focus on featureless contrastless things like walls
That sounds a really useful feature... how is the compatibility with the other features of the k30 (p-ttl and HSS)?
Quote: I just checked my K-30 and a Metz 52 AF-1 flash. Don't have to change anything on the camera, but the Metz' AF assist light has to be turned on in options, and then the flash set to Spotbeam mode if you don't want the flash itself to fire.
That sounds another pretty cool option!
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My issue, on the contrary, is switching this AF assist off on my Metz 58 AF-2 coupled with Pentax K-3.
When I had Pentax K-5 IIs, I switched off the camera's AF assist and the flaflight's AF assist, everything was fine. Then I sold the camera and baought Pentax K-3. I put on the Metz with the same settings and now the flashlight's AF assist is always on (when it's rather dark). Now I can't even find a menu option to switch the AF assist off, the menu item is missing.
I'm not really qualified to comment on this but isn't the Metz firmware updateable via USB? I think the current firmware was release before the k-3 so maybe they'll release a future firmware update to fix it - it might be worth contacting them to see if they are aware of the issue. Having said that I would have though quirky behaviour of the flash (p-TTL/HSS not working or generally not doing what the flash or camera options say) would be indicative of compatibility issues rather than a menu option on the flash dissapearing.
I did want to quickly mention that I may have been unduely harsh on using the sigma lens and the k 500 focus assist light - a lot of the issue is also my inexperience. I had a go using the set up again in virtually pitch black settings and out of about 20 shots I had focus issues on 2. One of these issues was a failure to focus on anything on the first attempt (it managed it on the second attempt) and in the cameras defence it was a random shot of a wardrobe with very little for the camera to focus on (i.e. not really a shot you would aim for in the real world). The second the camera focused on the wrong thing but I had the aperture wide open and had a short DOF. In my experimenting/researching/learning; if that was a shot I only had one attempt at, I would never have set the DOF field so narrow and so I would have still made the shot!
Also my experiementing last night suggests that I was wrong that the lens blocks the focus assist lighting the central focus point - but it's pretty close. I was trying to use center point focusing but looking back I think the "focusing on the wrong thing" issue suggest I might have had it set on the automatic 5 point setting.