hss and manual lens

cannot seem to get higher shutter than 180 to show using manual lens such as Pentax M28 f3.5. the camera shows a higher speed until the flash is switched on when it drops to 180, flash unit is AF360FGZ. works fine with the Pentax 17-70. am i missing something or is it a limitation of this flash model that it does not allow HSS with M type lenses

Joe, the problem is the Manual focus lens ..... HSS is a subset of P-TTL, and P-TTL requires autofocus lenses.

Now, that's my 'official' statement. but. .... You might find it worth trying with an A series lens, set to the A position .... This might work ok

thanks Nigel, you are right. i did go on and try other lenses and it does work with any lens where the camera controls the aperture . so A type lenses and all the Tamron Adaptall lenses as long as you use a PK/A adaptor are fine.

Yes, the aperture coupling will get the mechanics of it all working, but we should not expect accurate or reliable flash exposures in P-TTL with Manual Focus lenses. I hope your HSS shots work out well

i only want it to be able to hand hold my macro lens as i can get a high shutter speed in poor light to overcome camera shake to help CIF in being accurate and a very shot burst of light that just lights the subject. this is what i got, the background was blacked out easily as it was quite dark anyway

It's the results that count, and I think that works beautifully .... Lovely colour balance , and you've certainly knocked out the background with that very short exposure time. The other advantage with flash for this sort of thing is being able to use a smaller aperture, and still handhold.

It's a good place perhaps to note that HSS flash is not necessarily a way to freeze movement ... In fact normal flash is probably better at that, because the flash burst is much shorter .... An HSS flash is effectively a continuous light source that remains on for the max sync time (eg 180th sec), regardless of the actual exposure time, so it can produce more movement effects than normal flash. But in your case here you also wanted to remove the ambient light on the background.