Olympus patented a series of possible super wide angle zoom all starting with the focal length of 5mm and ending between 25mm and 35mm. May I ask some experts here if that lens is for a normal compact camera or for a larger size sensor? Thanks!
P.S.: Note that this is a very slow lens, that’s why I am having a doubt this may be for a normal compact camera…
Source: Freepatentsonline.
12 Responses
With an image height of 3.84mm, this is probably for a compact sensor camera?
Probably for a compact camera… XZ-2 has a 6-24 mm lens, so let’s pray it is for an XZ-3. That would make an eq. 24-160 mm lens! 🙂
Obviously, going by the image height, and the angle of view, this is for a sensor with a crop factor of about 5, not for a 4/3 sensor.
Actually I did the calculations and assuming a 1/1.7″ sensor (crop factor of 4.5333), the lens would be 23-155mm equivalent.
Yeah, its a compact sensor lens. If that angle of view of 82.46 is horizontal it would be 21mm on the wide end, if its diagonal its 25mm on the wide end (in full frame terms).
Yes, here’s a simple calculator: http://kmp.bdimitrov.de/technology/fov.html
Figure 31 in full PDF shows it as folded optics compact.
That’s why there’s that big empty space behind foremost element which is needed by prism.
Which is also why abstract talks about reflective optical element in first group.
Aperture: f/4.6 – 6
Looks like a miniaturized, low-end compact camera’s lens.
Assuming angle of view is Horizontal,
82.46Deg Relates to 20.5mm Focal Length on 35mm format.
20.5mm/5.07mm = 4.04 Crop Factor Suitable for a 1/1.7 sensor
On Second thought the FOV is probably for the image circle so we are looking at a crop factor of 4.86 Suitable for 1/2.3″ sensor at
24mm eq focal length
Its a 1/2.33 sensor, 5.5x crop factor basically a 27.5-188.5mm so 28-190 or 28-200 if they fudge the numbers and F4.6-6.0 so i tiny slow lens in a cheap P&S… it does appear to me mostly inner zoom and inner focus