I Hope we can agree to disagree Gwyn Pentax have their price structure, and it could be different with Richo,why will sigma be cheaper than Richo,the quality and price the 18-50 and the 55- 300 kit lenses are good, why not continue on this line of lenses,and make more of the longer lenses.

I maybe off the mark here but, could Sigma decide that Richo will be making legendary lenses again,to the standard of,250-600, 600 f4, 300 2.8,or cheaper 150,500 which is very popular, Richo have said they want to increase the camera side of the business,that is the reason for buying Pentax.

This would lead to a costly development for Sigma, that may not match the quality of pentax, or even price.

I have been using these from lilyrst china for about 3 months and have worked without any problems.

For $A39.99,you get one trigger and 3 receivers.

lilyrst china,
★OFF-CAMERA★PT-04→Wireless Remote Flash Trigger←PT04✚❸R

I am not very experienced with flash use, but wanting twin flashes for Macro work thought Flash-trigger and Receivers would be the cheapest way to go,using two Panasonic Flashes about 30 years old fixed on a length of steel, bolted to tripod-socket and holes on flat steel,these receivers
have thread in the base for 1/4in bolts

Checking Ebay came across these, NEW★Wireless Flash Slave Trigger✚❸Receiver►PENTAX◄PT-04 (270646375502).

For the sum of $AU39.99,from lilyrst,I have used them for a couple of months without any problems.

In my limited experience I have found my better lenses are very Sharp at f4,the 150-500 in good light works very well wide open at f6.3.

Yes they perform best at about f8.

The best way I can explain it there are two rings on the lens, one for setting the aperture, the other to open it up to focus then it is closed for the shot.

This thread has gone on for too long, if the OP had moved the post all of this would have been a non event.

Umps,refs and moderators have a job to do, why people will not accept their decision and move on is just plain silly to me.

Have you turned on catch in focus,this won`t allow you to take shot if green hex is not showing.

Have you tried setting camera to manual on focus mode lever,on the front of the camera.

I have used K35 f2 in very dark light,overcast at about 10 O`clock at night, I would set shutter speed to 30 sec with no problems,it will open the shutter and take properly exposed shots.

Don`t ban him it makes good bedtime fiction, you don`t get this for free very often.