Envelope.

Don't tell that to the people who make rubber rings.

Take the lid off.


I don't know. Why is jam made from oranges called marmalade? In spain, all fruit 'jams' are called marmalade.

I still like my answer better.

Try this then (you've probably come across this before but I like it).

Three people go to a restaurant and order a meal. They eat and enjoy the meal and ask the waiter for their bill.

The bill is £10.00 each, totalling £30.00.

Just as they are about to leave, the waiter admits to having made a mistake by adding a bottle of wine costing £5.00 to their bill, which they did not order.

The three agree to take £1.00 each as a refund and reward the waiter's honesty by allowing him to keep the remaining £2.00.

Now, if they each paid £10.00 initially, and received a refund of £1.00, they paid £9.00 each. 3 X £9.00 = £27.00, add to that the £2.00 kept by the waiter as his reward and that accounts for £29.00.

You can see where this is going now, where is the other £1.00 from their initial payment?

No it isn't. It can't be. You can't have 2 ducks being both in front of, and behind one other duck. It can't happen.

The holes are there to let the butter in, silly. Or, more accurately, the crumpet is there to hold the holes together.

I don't shop at Tesco's so I can't answer the second part of your question.

Four, five, or six.

If the 2 ducks in front of a duck are the same 2 ducks as those behind a duck, the answer is 4.

If the same duck has 2 ducks in front and another 2 behind, the answer is 5.

If the 2 ducks in front of a duck are different ducks to the 2 ducks behind a duck, and the duck that has 2 ducks in front is a different duck to the duck that has 2 ducks behind, the answer is 6.

Funny, it said one left in stock when I ordered mine yesterday.

Yes you can, but Yvon's chart removes any ambiguity regarding the actual focus point, as there is only one high contrast target.

I already have the DA* 16-50. I would only keep the 16-45 for my lightweight kit.

1: Set the charts on a desk/table at 45 degrees to vertical.
2: Set your camera on a tripod, centre of the lens level with the centre line of the chart at slightly greater than it's minimum focus distance.
3: Set your aperture to max (smallest f number) and focus mode to AFC and centre spot focus point.
4: Set the lens focus manually to infinity.
5: Use AF to focus on the centre line of the chart.
6: With the camera set to Av mode, take a shot.
7: View the shot on your monitor to properly see whether your chosen lens is forward or back focussing.

I suggest repeating steps 4 - 6 several times for each lens before making your decision to adjust or not.

EDIT: Added the bit about centre spot focus, which I forgot first time round.