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Forum: Pentax SLR Lens Discussion 03-03-2015, 12:45 PM  
How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8
Posted By kilburn
Replies: 870
Views: 275,733
Just to check, because I have mistyped it once too, you are naming the file modset.459, and not modeset.459, right?
Forum: Pentax SLR Lens Discussion 03-03-2015, 07:55 AM  
How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8
Posted By kilburn
Replies: 870
Views: 275,733
K100D Super - Instructions, tested as working this weekend, to enter Debug Mode.

1. Create a file named modset.459 containing the following commands, and put it on the root directory (not in any folder) of an SD card:

[DEBUG_MODE EN]
[OPEN_DEBUG_MODE]

2. With the battery door open, and whilst holding down the AE-L and INFO buttons, turn the camera on.

3. Let go of AE-L and INFO straightaway the camera powers up, and then immediately press MENU, MENU, INFO in quick succession.

If you are successful, you should see a menu consisting of entries in white block capitals on a black background. The first menu item is DEBUG MODE. You have to be pretty quick with the button presses, so if it doesn't work, switch off and try steps 2 and 3 again.


These are pretty much the same instructions as for a K100D non-super, but the non-super does not require a modset.459 file on the SD card.
Forum: Pentax SLR Lens Discussion 12-25-2014, 12:43 PM  
How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8
Posted By kilburn
Replies: 870
Views: 275,733
Many thanks to all contributors to this thread. Particular mention for bennyxyz's post on page 23 whose instructions I ended up following. I used a K100D Super, the only difference being that with this model you first have to enable debug mode by creating a MODSET.459 file and copying this to the SD card per the instructions already detailed earlier in the thread.

I took an eBay gamble on a SDM failed 50-135, boxed with all accessories and in otherwise excellent condition for £130 last week. Successfully converted it to screw drive yesterday and took my first shots today while out for a Christmas Day walk. Its a lovely lens that I otherwise could never have afforded, so a real Christmas bonus! :)
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