|
Forum: Pentax SLR Lens Discussion
02-13-2018, 10:43 AM
|
| |
After much assistance from UncleVanya I have performed a lens conversion and reversed it. For anyone looking for a simple way to do the task, you should consider purchasing a K100d from Ebay or wherever you can find one at a reasonable price. In fact it doesn't even need to be fully functional as long as most of the electronics are fine and the subject lens will mount properly. I bought one on Ebay because my regular camera is a K3-II and that model (probably most models that came after the K-5) will not allow you to do the conversion. So, assuming that you have a K100d, the instructions are different from those described early in this thread and much simpler. Here we go. Oh wait, the disclaimer must come first. Continue at your own risk - I am not responsible for any damage that may occur to your equipment. I have no special training or experience and cannot attest to the results of this conversion beyond stating that it worked for me. Now we can proceed.
- First check to ensure that you have put new batteries in your K100d. If the batteries die while doing this conversion you will be very disappointed with the outcome.
- Place an SD card in the designated slot. It's best that it is a blank card. Do not close the SD card door.
- Hold the INFO and AE-L buttons at the same time as you turn the camera body power on.
- You have five seconds to do the following: Press MENU, press MENU again, press INFO. Three actions, one after the other. You are now in debug mode.
- Press Menu again and then close the SD card door.
- Select LENS EEPROM R/W and press OK.
- Select LENS EEPROM STORE, the camera should say "wait".
- Power down and remove the SD Card. Put it into a card reader for your PC and look to ensure there is a file called LENS SEEP.LNS. If not, try again.
- Copy that file to a backup folder on your PC. That is your safety file in case something goes wrong. You can also use it to reverse the process from screw drive to SDM.
- Use a text editor such as Notepad++ or even the one that is built into Windows. Any text editor (not a word processor) will do.
- Now go to the start of this thread and follow the instructions for the 50-135 lens (I think they are pretty much the same for the 16-50 but you should confirm that with someone). I followed a slightly different process than shown on the video. Rather than changing all instances of C0 to 80 and then correcting the exceptions, I used the replace function in the text editor to go to the next instance of C0 (that is "C" and zero) and either replace, or if it is not in column 3, press next to skip that one and move to the next instance of C0. It just takes a minute either way but you will avoid errors this way. Only change those instances of C0 that are in column 3. I used Notepad++ and it even selected one of the row headings containing a "C0" so you want to watch for that; you only want to change column 3. When done save this to your SD card. There should only be one instance of the file on that card.
- Follow the above instructions except when you get to EEPROM R/W, select LENS EEPROM LOAD.
- Power down and power back up, reformat the SD card. Remove the lens and put it on your regular camera body to see if it is now working as a screw drive lens. If yes, you are done.
As you can see this is much simpler than the procedure with some later camera bodies. Remember that the above instructions are strictly for the K100d. For any other body make sure you do your research to find the correct method. You can't share the file you created with anyone else because it is lens specific. You can however convert someone else's 50-135 if you have their lens by following the above process.
Now go and do some photography!
|
|
Forum: Pentax SLR Lens Discussion
12-31-2017, 07:46 PM
|
| |
Has anyone been able to make this conversion to screw drive using a K3-II? I have a 50-135 and I wanted to convert it over but as I read the instructions and some other posts including this one at DP Review I am starting to think that I'm out of luck. I don't have access to an older Pentax to do the conversion.
|
