I have several lens from my dad's era that I want to put up for sale. Don't know what to charge so have been monitoring on the E.Bay site After six months I have not seen the following....A 35-105. 3.5.....F 24-50 F4....Sigma 35-105 3.5-4.7 Jessops APK telephoto lens adaptor. Would anyone guide me on what are the going price for these.

Thanks for the explanation, John. My curiosity is crushed and my mental powers exceeded....and I am no wiser, but should I be. I am amazed at the extent you Pentofiles delve into your equipment. If I take a pic and it isn't just so, I blame myself. Maybe I should be looking at my equipment instead!!!

Interesting, john...but what is decentering. How is it relevant to our lens, please?

That is a relief...Knew there must be something I am doing wrong. Have checked the camera and lens against the focusing chart and all seems correct. Forgot my 70-300 tamron so decided to put the converter on the back of my 70-210. It seemed logical to me. Oh well. Maybe next summer when the cadets get another opportunity. Next question. Asked SRS for a split screen update. No Pentax split screen, so not interested. How can I proceed? I can get a split screen but beyond me to fit it. Who can I approach to do this with confidence?

I am getting a little confused. The glider is quite large at the distance I was focusing on it. The red focusing dot was on the glider. I took at least 6 or 7 shots of the glider landing. I should have been able to get one or two right. Getting them all wrong makes me ask questions. Had I mised the glider, then the clouds would surely be in focus, not as is, that all is out of focus. That is my reasoning, right or wrong. I have now used a focusing chart and most lens show no problem. Just wondering. I was using an F 70-210 backed by my Pentax 1.7 converter. Maybe this combination has let me down. Have tried the 70-210 on the chart and from a brief check it seems to be OK. Totally confused am I. I really am disappointed having sat on my bum for two hours without a decent result

Thanks, Guys. The pic is resized to load onto the gallery, but the original is just as out of focus. The settings are.. Point focus, panning, and the AF point setting at AUTO and as you know at F8 @3000s. I took about 100 shots. Maybe some could be down to my panning but ALL are out of focus. Surely, I should get some of these right. I suspect the autofocus system in the camera. Have since taken pics, at SRS suggestion, on green mode and these suggest the auto focus system is letting me down. Any further comments welcome.

Hi. I have uploaded a pic in the gallery. I spent a couple of hours taking pics of air cadets flying gliders. I am now viewing them and think they are all out of focus. Can someone confirm to me that I am seeing right? I changed to spot metering in the hope of getting a better response but I don't think this made a difference. The camera was set to AF.C to follow trhe movement of the gliders. Is it me, or the ca,mera? comments, please

Daniel. For what it is worth, I was told by a well respected judge that subconsiously, we scan pictures from left to right as we do when reading. We should try to put the main point of focus on the left hand side. We then look at the rest of the photo as we scan through. If we put the main focus on the right then we scan over the left side of the picture, being drawn to the point of focus. How valid this all is, I am not sure. I actually prefer the 2nd one. How this affects those who read from right to left, I don't know.

Have you???

To see one is a priviledge. To aim a camera at one is a rarety. To actually take a shot of one is magical. Lucky you.