After further tests the underexposure seems to vary between
1/3 and 2/3 stop.

I carried out the same test with my A 50mm f/1.7 and that seems consistent at all apertures from f/1.7 upwards. Strangely this lens overexposes by about 1/3rd stop. Could possibly be ignored as long as there aren't any white highlights.

This pic shows the difference in exposure between the two lenses at f/4 The central rectangle is from the f/1.7 and the main rectangle from the f/1.4




The camera was in Av mode and the exposure for both shots was 1/23.3 secs. at f/4.0

From these results I can't see any point in having a 50mm f/1.4 lens
The f/1.7 actually gets more light on the sensor. 1/2 to 2/3 stop
more in this instance.

Because I've only tested two lenses with one camera I have no way of knowing if other camera/lens combinations will be the same. It's such a quick and simple test I would suggest that it's done for every lens and camera.

All new products go for a premium price when first released.
It then depends on the market if they come down or not.

Just put my clock back to the 1st July..... but..... It still
feels like WINTER!!

And I thought the Streets of London were paved with Gold!

Very much like Manchester then?

This was the original thread.

Amazing stuff!

Sadly since Casio stopped making their Jog/Shuttle, different melody everyday Cube Alarm clocks, you can't buy a decent digital alarm clock I'm sick of trying

I use Grasslin timeswitches they have a button that you push to move back and forward 1hr Well worth buying really easy to set, you don't even need the leaflet ebay or supplier

It takes 50 hours for staff to change all the clocks in Buckingham Palace

Buy all radio clocks that set themselves to the Atomic Clock

So it is.... sure it said Springwatch on the Guide