Thanks - just wondered if these were M42 mount. I don't have any of those lenses to check, but haven't managed to find a K mount image anywhere without the little lever, which these don't have.

Sorry - going mad. Are these Pentax K fit?

http://www.ffordes.com/product/11111806425381

The back doesn't look like either of my PK fit lenses. They have a small lever sticking up and I can't see that here.

Thanks - I'll have a look.

Advice much appreciated. If anyone can point me in the direction of a decent set of manual or A contact tubes I'd be grateful. All I can find are cheap manual or expensive AF.

To be honest I don't really need something with A contacts, at least for now. I was looking to use them with a fully manual lens, but didn't want to get something so cheap that they didn't fit properly or worse still get stuck on the camera.

I've been looking, but can't see anything available between the cheap £8 sets and the fully auto sets at £150 plus.

Would a used bellows or a new Raynox be a better alternative? I'd be using them with a 135mm prime.

Thanks - it hadn't occurred to me that they might be plastic. I'll make sure I check.

Hi

I'm looking to get a set of manual extension tubes. I don't need electrical contacts as they will be used with a fully manual lens. Does anyone have any experience of the cheap sets available all over Ebay for around £8. Just wondered if they were o.k. or whether I need to pay more.

Any advice appreciated.

Thanks. That's what I thought. It's just this particular lens that seems to under-expose all the time so I was looking for a lazy way out!

Cheers Bill

I'm not sure I made myself clear - I did wonder if I'd explained it properly. Reading it again I'm not sure.

I have the camera in Manual mode as, as far as I can tell, this is the only mode that I can get the camera to meter in for a manual lens.

I set the focal length when I turn it on. The shutter speed shows correctly and the aperture shows F--. I set the aperture using the ring on the lens, frame the photo, then press the green button to correctly measure the aperture (nothing shows on screen, just F--). Then take the picture. This does work as I can tell the aperture has been read correctly by the resulting photo.

In every other mode pressing the Av button allows me to adjust the exposure by a set amount - in manual mode this button seems to do the same as the green button ie. take a reading.

Pressing the Av button whilst turning the wheel, as the manual says, doesn't toggle between shutter speed and aperture, just clicks and takes a reading in the same way that the green button does. I can only adjust the shutter speed which is fine.

I know I can adjust the shutter speed down a little to deliberately over-expose each time, but as the lens consistently underexposes by around 1.3 I just wondered if there was any way of setting the camera at +1.3 and leaving it whilst in this mode. It doesn't look like there is, but it's not a problem.

I just get carried away taking pictures sometimes and forget that I need to over-expose each time to get the correct picture so it would have helped if the camera could do it for me! Spoilt by auto lenses I guess.

Thanks again for taking the time to reply.

I'm probably being a bit thick here, but is there any way to set EV compensation in 'M' mode on the Pentax K-r?

I'm using a manual lens without an 'A' setting so need manual mode to meter correctly, but the camera has a tendency to under-expose by around 1.3 EV or so. I realise I can adjust the shutter speed to deliberately over-expose each time, but wondered if there was any way of setting the camera to do this automatically?

I can set it to +1.3 in AV mode, but can't then use the metering!

Hope this makes sense

Thanks