[hjoseph7]

I bought a Used Pentax 43 mm recently and although I love the lens, I noticed that occasionally it was a kind of hard to focus. I would see the red Focusing-Point blink on the subject, then Confirmation (green light) at the bottom of the viewfinder would become solid, then I would hear a beep telling me its OK to press the shutter, right. For some reason and I'm not sure if I had too much Coffee that day, the Focusing-Point would suddenly jump out of focus(not by much) while the camera kept trying to focus before I had time to press the shutter, so by the time I hit the shutter button all the way down, the picture was slightly out of focus ?

To remedy this situation I began using the Back AF button on my K5 II and the problem went away. Thank god for that back button because I was thinking about returning the lens ! Since it doesn't happen often and since I got a work-around for it now, I'll save myself the aggravation. I just wanted to post this in case anybody has run into the same thing.

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Last edited by hjoseph7; 05-23-2020 at 07:46 AM.

[pepperberry farm]

BBF (back button focus) is one of those things makes you wonder why the camera isn't set up that way by default...

[Aaron28]

I can have that happen when using multiple focus points like auto 5/9 which ever and also if the focus drive is on continuous vs single

[hjoseph7]

I can have that happen when using multiple focus points like auto 5/9 which ever and also if the focus drive is on continuous vs single

I was only using the Center Focusing point ? it could be that the camera was set for continuous focus without me realizing it...

[Aaron28]

it could be that the camera was set for continuous focus without me realizing it...

a possibility ......as I have had that happen not paying attention to various settings I go through

[pschlute]

I was only using the Center Focusing point ? it could be that the camera was set for continuous focus without me realizing it...

Very likely. The way the camera works in AF-S is that once focus lock is achieved (green hexagon lit), it will not refocus unless you release the half press of the shutter button, and re-press it.

[hjoseph7]

I was only using the Center Focusing point ? it could be that the camera was set for continuous focus without me realizing it...

You are probably right. I just tried it today and had no problems. I do remember playing around with the Continuous Focus button . I probably never set it back to Single. Thanks, now I can breathe a little easier.