On the old film cameras,eg ME etc. you could just set the aperture and the shutter speed would be calculated as you pressed the shutter release to take the photo. So much for progress!

John K

If you want to experiment, there is a custom menu setting "Using aperture Ring". Turn that on and you can then use what Pentax call it "M (Hyper-manual) Mode". You can leave that turned on, it doesn't affect normal auto lenses.

To take a photo you'd have to set the camera dial to Manual (M), set the aperture, press the green button and the camera will set the shutter speed. Pressing the green button closes the lens down and take a meter reading.

This is exactly what you'd have to do with a fully manual lens unless it is being used on an older film body before Pentax crippled the lens mount.

Leaving the camera mode on Av does what you've found, takes the photo at full aperture.

John K

If you set the aperture manually you'd have to treat it as if it was an M lens and meter using the Green Button. To have it meter automatically and set it with the camera dial leave it on the A setting. It doesn't sound like there is anything wrong with the lens at all; what you've found is normal.

John K

How old is your camera? Surely not more than two years old?
Did it just go wrong one day or did you drop it or bash it with something or poke around inside it? Did the fault start suddenly or was it something that gradually got worse?

What happens if you turn image stabilization off (if it lets you?)
Can you playback earlier images OK still? After all they do not neeed the stabilization feature at all!

If the camera has malfunctioned after less than two years it is not acceptable to have to throw it away unless it has been accidentally run over by a bus or something!

What did the camera supplier have to say about it? If it was the old Jessops, then the new Jessops isn't the same company and they might take on the repair at double the cost to them; in which case get in touch with Pentax UK who I feel sure will help if it was due to a manufacturing fault, but probably not if a package of pieces following an accident, in which case just get a new one!

John K

Clearly not a Pentax!

John K

I know when it goes wrong you end up in panic!

Have you tried the store where you purchased it from? The Sale of Goods legislation ought to apply. Your contract would be with them. Further info from Which magazine here link

I believe some users with camera body issues have contacted Pentax direct who have been known to be helpful too.

John K

Congratulations and well deserved.

John K

Actually it shows the horizontal pixels of both is 7424, but resolution isn't everything. The pixel pitch is significantly different.

John K

What a magical portrait, well done. (Regret I cannot help with your query.)

John K

What seems to be missing from this thread is an actual photo of a 'blue' bluebell, so to correct that, here is!