Hi RiseUpGames and everyone,
I've got another question on how to properly use the manual focus. I just got my own iStabilizer XL today and decided to play around with 2 and 4 seconds exposure options of ProShot. I absolutely love to be blown away by the low-light capability of my Lumia 920 :wink:.
So, I put the Lumia on the tripod, went outside, and shot long-distance shots. For these, I used manual focus and set it to hyperfocal (slider to the most right). I went back into my apartment, uploaded the pics into the computer, and noticed that the pics came out grainy and out of focus. Even without fully zooming in, I could already tell the pics didn't look too sharp. The pics quality totally don't match many of the pics posted in this forum.
So, I decided to try again, but this time, I was shooting two identical frame with auto and manual focus back to back. Below is the result.
Camera settings: ISO 100, exposure = 0, shutter time = 4, the rest = automatic, with a tripod. Time: around 11pm.
With auto focus. The focus is around cars in the center of the pic.
View attachment 36185
With manual focus set to 100% hyperfocal.
View attachment 36186
The first pic is clearly sharper than the second one. The apartment and the trees in the center of the screen just look so much better in the first pic.
So, am I using the manual focus wrongly? To use hyperfocal, what does the minimum distance of the object have to be? The distance between my Lumia and the trees in the center is about 100 feet. Isn't that supposed to be far enough? RiseUpGames, is there actually a special trick to the manual focus of this app?
The answer to this requires a bit of an explanation:
Under extreme weather conditions (hot or cold), certain materials can warp. Lenses are no exception to this. In order to compensate for the expansion or contraction of elements, lenses are designed to focus past infinity, so that there will never be a condition in which the lens cannot focus to infinity.
When you adjust focus to 100%, depending on your environment, you may be focusing past infinity, resulting in a slightly out-of-focus image.
There is no way for me to determine exactly where infinity lies on these cameras. The best practice would be to just AF on a far-away object and use focus lock.