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