It came today. Apparently no import duties due. All that I need to do now is learn how to use it. 😏 It's a very basic K-mount - I'm guessing a T-mount with a K adapter. Mounted easily on the K-1, but showing "F--" so I guess I'm going to actually have to RTFM to figure out how to tell the camera what I want it to do. With a quick perusal I didn't see anything about U1, U2, U3 ..., but I think I did find how you set the shutter speed when using a non-A lens More homework I guess. -- Vivere in aeternum aut mori conatur -- This email has been checked for viruses by AVG antivirus software. www.avg.com

For non-A lenses, I think there is something in the menu you have to enable in order to use them at all. If it will do auto-stopdown (unlike screwmount Pentax lenses), pressing the green button will stop it down and set the shutter speed. On 2026-04-23 14:48, John Sessoms wrote: > It came today. Apparently no import duties due. > > All that I need to do now is learn how to use it. 😏 > > It's a very basic K-mount - I'm guessing a T-mount with a K adapter. > > Mounted easily on the K-1, but showing "F--" so I guess I'm going to > actually have to RTFM to figure out how to tell the camera what I want > it to do. > > With a quick perusal I didn't see anything about U1, U2, U3 ..., but I > think I did find how you set the shutter speed when using a non-A lens > > More homework I guess. > > -- > Vivere in aeternum aut mori conatur -- Larry Colen LRC@red4est.com http://red4est.com/lrc

My boss isn't back from lunch yet, so I did a bit of google fu and found this pretty good writeup. The key is that in the C menus there's an item called "use aperture ring". https://fabioardito.com/how-to-use-vintage-lenses-on-pentax-dslrs/ On 2026-04-23 14:48, John Sessoms wrote: > It came today. Apparently no import duties due. > > All that I need to do now is learn how to use it. 😏 > > It's a very basic K-mount - I'm guessing a T-mount with a K adapter. > > Mounted easily on the K-1, but showing "F--" so I guess I'm going to > actually have to RTFM to figure out how to tell the camera what I want > it to do. > > With a quick perusal I didn't see anything about U1, U2, U3 ..., but I > think I did find how you set the shutter speed when using a non-A lens > > More homework I guess. > > -- > Vivere in aeternum aut mori conatur -- Larry Colen LRC@red4est.com http://red4est.com/lrc

It's NOT auto-stopdown. It is a manual aperture that I can preset. I can set it to a particular aperture and then twist the aperture ring to make it wide open for focusing & when I twist it back it will stop at the preset aperture so I can set the shutter speed. Th user manual INDEX does not have an entry for how to set it up to use a manual aperture ... so I'm just having to read the whole thing to see if it's there under another name. It may be in the index and I'm just not smart enough to use the right search term. I hope I'll learn. I'm thinking those "U" modes might allow me to set up the menu so I don't have to set it up every time I want to use this lens ... just program U1 (or whatever) with the appropriate functions & whenever I want to use this lens put the camera in U1 and it's set to get proper exposure with manual focus/manual aperture. On 4/23/2026 5:54 PM, Larry Colen wrote: > > For non-A lenses, I think there is something in the menu you have to > enable in order to use them at all. > > If it will do auto-stopdown (unlike screwmount Pentax lenses), pressing > the green button will stop it down and set the shutter speed. > > On 2026-04-23 14:48, John Sessoms wrote: >> It came today. Apparently no import duties due. >> >> All that I need to do now is learn how to use it. 😏 >> >> It's a very basic K-mount - I'm guessing a T-mount with a K adapter. >> >> Mounted easily on the K-1, but showing "F--" so I guess I'm going to >> actually have to RTFM to figure out how to tell the camera what I want >> it to do. >> >> With a quick perusal I didn't see anything about U1, U2, U3 ..., but I >> think I did find how you set the shutter speed when using a non-A lens >> >> More homework I guess. >> >> -- >> Vivere in aeternum aut mori conatur > -- Vivere in aeternum aut mori conatur -- This email has been checked for viruses by AVG antivirus software. www.avg.com

Ok, finally sussed it out. What it will do is set the correct shutter speed in manual mode. Compose, focus, stop down, green button to set the shutter speed, make the exposure and it comes out properly exposed. Exposure compensation [+/-] also works and if you press the AutoFocus button while adjusting the focus manually the camera will beep at you to tell you when it's in focus. I've only had a chance to play with it a little bit (my planned outing on Saturday unfortunately got rained out), so I still don't have anything I want to share. Gotta' get busy today because I have a new online (Zoom) photography club on Wednesdays from 2:00pm EDT to 5:00pm. The online classes I've been taking are in recess for the summer so the instructor can go to Florida & see her new grandbaby, so we, the students, decided we'd organize our own sessions for the summer ... and since I'd recently purchased a Zoom "pro" package I offered to host. Anyway, I want something I can use to show off the capabilities of my new acquisition ... Hope all y'all are doing well. On 4/23/2026 6:20 PM, John Sessoms wrote: > It's NOT auto-stopdown. It is a manual aperture that I can preset. I can > set it to a particular aperture and then twist the aperture ring to make > it wide open for focusing & when I twist it back it will stop at the > preset aperture so I can set the shutter speed. > > Th user manual INDEX does not have an entry for how to set it up to use > a manual aperture ... so I'm just having to read the whole thing to see > if it's there under another name. > > It may be in the index and I'm just not smart enough to use the right > search term. I hope I'll learn. > > I'm thinking those "U" modes might allow me to set up the menu so I > don't have to set it up every time I want to use this lens ... just > program U1 (or whatever) with the appropriate functions & whenever I > want to use this lens put the camera in U1 and it's set to get proper > exposure with manual focus/manual aperture. > > On 4/23/2026 5:54 PM, Larry Colen wrote: >> >> For non-A lenses, I think there is something in the menu you have to >> enable in order to use them at all. >> >> If it will do auto-stopdown (unlike screwmount Pentax lenses), >> pressing the green button will stop it down and set the shutter speed. >> >> On 2026-04-23 14:48, John Sessoms wrote: >>> It came today. Apparently no import duties due. >>> >>> All that I need to do now is learn how to use it. 😏 >>> >>> It's a very basic K-mount - I'm guessing a T-mount with a K adapter. >>> >>> Mounted easily on the K-1, but showing "F--" so I guess I'm going to >>> actually have to RTFM to figure out how to tell the camera what I >>> want it to do. >>> >>> With a quick perusal I didn't see anything about U1, U2, U3 ..., but >>> I think I did find how you set the shutter speed when using a non-A lens >>> >>> More homework I guess. >>> >>> -- >>> Vivere in aeternum aut mori conatur >> > -- Aeternum vive aut conando moriere. -- This email has been checked for viruses by AVG antivirus software. www.avg.com

On 2026-04-28 12:51, John Sessoms wrote: > Ok, finally sussed it out. What it will do is set the correct shutter > speed in manual mode. > > Compose, focus, stop down, green button to set the shutter speed, make > the exposure and it comes out properly exposed. Yeah. That's it. It's been a while since I've used a fully manual lens. > > Exposure compensation [+/-] also works and if you press the AutoFocus > button while adjusting the focus manually the camera will beep at you > to tell you when it's in focus. Look up "catch in focus", if the camera is in autofocus mode, it will take the picture when the subject under the autofocus point is in focus. In theory it's awesome. For still objects I'll use focus peaking in live view mode. -- Larry Colen LRC@red4est.com http://red4est.com/lrc