They stay in the Outbox until the recipient opens them to read them
Matt

PM re Tokina 80-200

Gallery with commented instructions and hints:

Pentax FA80-320 Disassembly Photos

Usual disclaimers apply!! Don't blame me for anything that goes wrong if you are mad enough to try this

(Photos taken with Pentax Q + Q01 Standard Prime)

LOL!

Definitely a labour of love fixing this
(But a very good learning curve too!)

Matt

Hurrah!!

The Sugru worked an absolute treat.
My request about the screw posts wasn't 100% technically correct. It wasn't that the threads were stripped, but that the square posts has been split (thereby opening up the threads).

I'd thought I could fix with Araldite, but on further inspection it would have clashed with other parts So, I used a combination of Humbrol plastic cement (carefully applied with the end of an older screwdriver), and superglue gel.

I reckon if that doesn't hold then I'll have to convert the pillars to nut + bolt fixings. Heating up a nut to around 265°C will allow me to sink it into the plastic. But this will be a one way ticket and needs the right countersunk screws.


Initial shots look fine. Will compare with DA55-300 for sharpness later.

And when I get a chance I'll write it all up with photos

Matt

Just tried it...

And checked against the manual. It's a bit of a strange implementation, but I suppose there must be a reason. (It does allow you to quickly cancel all AF adjustments)

It is NOT cumulative (my mistake!)

When you select the AF Adjustment page there is a green arrow highlighting the setting that is currently being used. The manual says
It's the green arrow that shows you what's what

Doh! Feel free to throw rotten fruit...
Matt

...well, I can double check later and report back
Matt

Cumulative (otherwise surely it would be "Apply All unless you've done an Apply One" ).

There's a 'hidden' engineering adjustment value (that can be set by an engineer via the debug menu) that is applied first.
Next, the "Apply All" adjustment is added.
Finally, the individual "Apply One" is added (if set for the lens).

As I've said, my body was back-focusing quite badly and there were individual fine adjustments for my lenses. When the K5 had to go for a mirror-slap repair (mirror motor replacement) JPSS very kindly calibrated it to my DA*16-50 (and calibrated the lens too). It took several weeks to get repaired and calibrated, but the results are now like I have a new camera and lens combination!!

The other lenses now need less adjustment - but still some tweaking.

As has been mentioned: you do not need to worry at all about making AF adjustments!!! You can just reset it all if you feel like you're not getting anywhere

Matt

Not by an end user - there's no option available.

Whether that option is there via PK-Tether or via the as-yet unavailable debug menu is another thing...

Matt

Thanks Yves

Oh dear John Sorry that didn't work out. I have a couple of dud FA28-70 lenses that may have equivalent screws You'll find the images of this episode scary!

Have Sugru'd the PCB in late this afternoon. Will find out how it works by tomorrow when I can try and fix the plastic posts.

Matt

Whatever it is you are all on... can I have some?

Many, many professionals do need focus adjustment. That's why Pentax put the custom option in their higher end dSLRs

Of course, it's probably not noticed at f/5.6 and smaller. At f/1.4 it's really important!


On a side note... my K5 had to go back for a replacement mirror motor and JPSS kindly calibrated the K5 + DA*16-50. Interestingly, the other lenses are more accurately focused too - but none of them 'perfectly'

Matt