Cheers guys, really appreciate your help 
New lens has arrived..
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Get a decent set of extension tubes i.e. Kenko that have electrical and mechanical pass-through. Taking the lens off and on for every shot isn't exactly a technique you can use in the field....
As others have said, the aperture change with focussing is normal with every lens but more noticable with macro lenses because of the focussing range involved. I'm rather disappointed by the number of people who had you floundering around trying different settings to change the laws of physics.
As others have said, the aperture change with focussing is normal with every lens but more noticable with macro lenses because of the focussing range involved. I'm rather disappointed by the number of people who had you floundering around trying different settings to change the laws of physics.
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Soldato
Serious?
I've never once seen the aperture keep changing whilst working in Av mode. Whether it be macro work or not.I fully understand that you lose light using macro extensions, but I've never heard of a camera changing the Fstop value to reflect this!
Didn't have that issue with the Sigma 70-300mm Macro (maybe it doesn't work the same as dedicated macro lens). The same can be said with the Olympus 50mm f2 macro lens too.
Serious?
I fully understand that you lose light using macro extensions, but I've never heard of a camera changing the Fstop value to reflect this!
IF you use macro extensions then no, the camera wont adjust.
The Macro lenses do signal to the camera that the aperture has changed since the change can be well over a stop so this is needed to adjust the exposure.
Should that not read "...set the lens to the selected aperture."?
Once again, thx you all for you input, i feel much better about my purchase now!
I have taken a coulpe of 'test' shots and this lens is SO sharp. Really pleased with it.
I have taken a coulpe of 'test' shots and this lens is SO sharp. Really pleased with it.
Serious?
I fully understand that you lose light using macro extensions, but I've never heard of a camera changing the Fstop value to reflect this!
Nikon bodies show the effective aperture, Canon bodies don't. The effective aperture changes as you get closer, at 1:1 there is around a 2 stop difference and at 5:1 there is around 6 stops difference. When set to f/2.8 at 1:1 the effective aperture will be around f/5.6 and at 5:1 around f/22.
Soldato
Confusing explanation
Surely the camera just meters differently, the aperture doesn't change.
Luckily this makes more sense:
Tried this 'trick' today. and it does not work for me
I set the aperture to F/2.8 pressed and held the DOF button, whilst releasing the lens, camera still switched on.... aperture not held
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Tried this 'trick' today. and it does not work for me
I set the aperture to F/2.8 pressed and held the DOF button, whilst releasing the lens, camera still switched on.... aperture not held
With the aperture set to f/2.8, it could be wide open (assuming f/2.8 is the max aperture for your lens), so when you press the DOF preview button, it stays wide open.
Try again with a smaller aperture (bigger f/ number) selected. Perhaps something around f/8 as a starting point.
Tried this 'trick' today. and it does not work for me
I set the aperture to F/2.8 pressed and held the DOF button, whilst releasing the lens, camera still switched on.... aperture not held
f2.8 is wide open, you need to stop it down.
^^ tried at all apertures from F/2.8 to F/8. The DOF button sounds and previews in finder, but when i realese the lens the aperture ring is closed to around F/16.
I give up.
I give up.
Yer, will do, tomorrow
Ok, apon further investigating, this is what is happening:
When i push the DOF preview button the aperture is set, no problem, but as soon as i go to remove the lens (whether camera is powered or not) the aperture ring closes 'as' i unscrew the lens if i start to screw the lens back on the aperture ring re-opens., Famas, can you try 1 time to see if this is a D90 trate?
When i push the DOF preview button the aperture is set, no problem, but as soon as i go to remove the lens (whether camera is powered or not) the aperture ring closes 'as' i unscrew the lens if i start to screw the lens back on the aperture ring re-opens., Famas, can you try 1 time to see if this is a D90 trate?
Soldato