Recent content by UY79

Before you comment any further, please go spend some time to read up any BASIC photography material on aperture, which can be found easily. I'm not going to discuss this here as it's off topic.

The difference between f/2.8 and f/4 is ONE STOP. One stop equates to doubling or halving of shutter speed, i.e. twice or 2x as fast or slow. However, when it comes to aperture, the difference between one f-stop to the next is by a factor of square root of 2 (1.414) and not square of a f-stop...

Camera sold.

Advertisement Category: Want To Sell (WTS) Equipment Type: SLR Equipment Brand: Minolta Equipment Model: Dynax 7 (film) with vertical grip Price (S$): $300 Description: Selling a Minolta Dynax 7 film camera with vertical grip. It has the ML focusing screen that gives better focus...

http://www.clubsnap.com/forums/showthread.php?t=335554

Care to make references to substantiate your point above? Here are mine: http://en.wikipedia.org/wiki/Purple_fringing http://www.great-landscape-photography.com/ultraviolet-filter.html

I agree that optics itself cuts away certain wavelengths of UV while coatings found in modern lenses will, in addition, absorb some UV. Although it might be significantly lesser with a modern lense, it doesn't mean that there wouldn't be any UV left as even UV filters don't cut out UV...

You are contradicting with yourself here. :think:

Through my searches, Ningxia is 2000m above sea level. UV should be about 30% more than at sea level. I can't really say for certain UV radiation that was the cause. But generally if you got photos that look like the ones you have shown in Ningxia but not had any back in Singapore, it could...

Since you said that you have used the camera AF on the subjects which is about 100m away, I suspect that the lack of sharpness in your China photo could be due to UV radiation. What is the sea level elevation where you took the photo? And what filter did you have on the lense?

I've no idea where you got the notion that if the camera that put the lense's focus distance scale "at" the infinity mark that your camera's focus is indeed at infinity. Have you ever have a good look at the distance representation on the scale? It's either logarithmic or exponential function...

Canon 450D - Affordable, checked; Competing price range, checked; Live View, checked. Did your checks? No.

You have some serious misconceptions about focus and DOF. DOF falls ahead of and after the point of focus. So when you put the focus at infinity, you will have DOF that starts at infinity. This also meant that your subjects can never be in the DOF as the DOF is at an infinity distance away...

Did you check with MSColor? Saw one sitting there about 2 weeks ago.

Make: Konica Minolta Type: Lense Model: Konica Minolta 28-75mm f/2.8 (D) Price: 400 Buy-and-Sell Link: http://www.clubsnap.com/forums/showthread.php?t=374925 Current Status: Sold