on freedom of expression

This time I deeply regret 15-M manifestation in Sol. Their direct engagement with Catholic World Youth Day teenager is really unacceptable. What did they do before these event was finally held?

In my opinion it is a really bad impression among happy teenagers who travel across continent and ocean leaving their family just to visit Madrid and meet the Pope.

Here's the situation on 23.00 of the second day of the JMJ event in Puerta del Sol. Really strange compare to the day before on the first day where hundreds if not thousand of young teenager around the world gather there with their country flags or region and various Catholicism apparels.

Clearly, ones freedom is limited by other's freedom. Respect.

oil on lens

Camera lens indeed has sophisticated mechanical parts. As other mechanical devices, lubrication is an essential treatment. However it doesn't mean that a lens needs lubrication.

Here is a severe example of the impact of a drop of oil on the aperture. The aperture mechanism is using a very light force. Therefore a small inhibitor will affect its functionality. The aperture blade is so light and designed with such kind of matte surface, apparently to prevent any glare. Therefore the oil fill the matte texture of the blade, and the cohesive forces between blades increase, so they are harder to move. Finally the diafragm cannot be changed.

I wonder from where did the oil come from? Apparently it came from the melting grease. But still I'm unsure, it may also came from silly human action.