whitewolfowner

Not every lens at a stated mm has the exact same field of view as all others do, even when figuring in the crop factors for different sized sensors. For example, if you look at 15mm lenses for FX cameras, they may vary for manufacturer to manufacturer by as much as 6 - 8 degrees of coverage or even more than that.

blackest Loc: Ireland

can you confirm this?

https://www.sony.net/Products/di/en-us/products/lenses/basics/focalLength.html

“Angle of view” describes how much of the scene in front of the camera will be captured by the camera’s sensor. In slightly more technical terms, it is the angular extent of the scene captured on the sensor, measured diagonally. It is important to remember that angle of view is entirely determined by both the focal length of the lens and the format of the camera’s sensor, so the angle of view you get from any given lens will be different on 35mm full-frame and APS-C format cameras. Different lenses of equal focal length will always have the same angle of view when used with the same-size sensor.

That's what Sony are saying, however I did find a site which was listing angle of view for different focal lengths and they qualified the angle as being at infinity focus, which implies there can be some change as you focus closer. Also you can't compare rectilinear lenses with fisheye.

Not that it matters a deal what the field of view is beyond using a shorter lens will give me a wider field of view than a longer (focal length) lens.

whitewolfowner

That is what I said. Go back and read my comment. If you question it start looking up different lenses, for the same format, and you will see that the angle of view for the same mm will vary; especially in wide to super wide angle lenses.

dmr

Hey Dragon: Fetzier was trying to teach you something Maybe if you understood the concept you would have understood how to set the program in the first place!

johnbee418 Loc: Manchester Conn.

I think you were standing too close. Step back.

Dragonophile

I am not trying to insult anyone, but I was just commenting that the post was answering a question I did not ask. A detailed math understanding of the concept of how field of view changes with mm and sensor size is again not relevant to my original question. My math was OK but I hadn't allowed for a digital multiplier. I simply had a wrong menu item activated.

Again, I am not looking to insult anyone or get involved in a meaningless argument. I appreciate the fact Fetzier took the time to write such a detailed post. If I came across as rude, I apologize to him.

wdross Loc: Castle Rock, Colorado

It looks like the image would have ended up as a 56mm equivalent lens. That would explain why the 38mm looked wider. A quick recovery from this would be to change to panoramic mode and shoot the ship in sections until you could find out what went wrong. Hopefully you at least shot one shot. I always hedge my bet by shooting RAW + JPEG. Chews up more memory but allows for possible recovery.

xptom Loc: Concord, CA

In a situation like this when a large object will not "fit" on the screen try taking a panoramic shot. In many cases all you need is two frames. Photo merge in PS. Easy as that!

burkphoto Loc: High Point, NC

Sure. Not to confuse things further, but while Micro 4/3 cameras have a native 4:3 aspect ratio, they can also be used at 3:2, 1:1, and 16:9, with the flip of a menu switch.

M4/3 cameras do have a 2X crop factor for stills. The crop factor for video depends on the specific camera and format used — it also varies from SD to HD to 4K.

I hate the term "crop sensor." NO sensor is a crop sensor. There are only cropped lenses. The crop refers to the portion of the projected image circle that is recorded (or "cut out") by the sensor. At native aspect ratio, we always get all of any sensor's pixels.

When you put a lens designed for a larger format on a smaller format camera, several things happen:

• MTF performance (absolute sharpness) is REDUCED. However, *apparent* performance is MORE UNIFORM from corner to corner. This is most noticeable when using full frame lenses on Micro 4/3 cameras. (Lenses specifically designed for a given camera format are potentially sharper than lenses designed for a larger format but used on a smaller format.)

• There is a change in field of view for a given focal length that we compensate for by reducing the focal length (50mm on APS-C Nikons has a field of view similar to 75mm on full frame Nikons, from the same distance to the subject).

• Due to the reduced magnification of the shorter lens used for the same field of view at the same distance, apparent depth of field increases.

cambriaman Loc: Central CA Coast

Questioning members should be more gracious when another Hogger goes to the trouble of explaining principles. Often, some questioners get a cryptic short answer that produces a long series of exchanges.

Be nice.

rfmaude41 Loc: Lancaster, Texas (DFW area)

I thinkest thou might consider redoing your math (and don't use degrees).

blackest Loc: Ireland

Those were the results from the calculator for the horizontal field of view How else to express the angle Pi Radians?
The focal lengths are actual focal lengths in mm with the lens crop factor applied. 1.6, 2.0 , 4.0
What answers do you get ?