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DPChallenge Forums >> Tips, Tricks, and Q&A >> Finding focal length info in point and shoot
Showing posts 1 - 9 of 9, (reverse)
02/10/2012 10:31:01 AM · #1
Hi all, I've a Canon SX130IS, and am just beginning photography. It has minimum focal length 28mm (in 35mm standard). But I want to use it around 50mm (35mm standard). The issue here is that there is no indication of how the focal length changes when I zoom in or zoom out. Does anyone have any idea on how set that info ON, or any other way to realize 50mm equivalent focal length with this camera.

P.S. Please don't advise to buy DSLR, I'm just a beginner.
02/10/2012 10:44:46 AM · #2
Do you know someone who has a DSLR? You could frame up the same scene and when they are at 50mm and yours looks the same, you know where that point is. Not sure how it could be marked for finding it again, however.
02/10/2012 10:50:31 AM · #3
I don't think you can. Some cameras have "custom" modes where the user can set the default zoom for the camera, but yours doesn't seem to be one of those.

The focal length is in the EXIF, so you could zoom to what you think is ~50mm shoot and look at the file info, adjust and shoot again if needed...once you have it set, it won't change unless you zoom or maybe if the camera is shut off and then back on again.

You could see if there's a CHDK software hack for your camera and try that.
02/10/2012 10:54:10 AM · #4
can i ask why you need to know? wouldn't you just frame the shot to whatever focal length works?

if you really need to know after the fact, the exif should record what the focal length was when a pic is taken
02/10/2012 11:00:16 AM · #5
Originally posted by mike_311:

can i ask why you need to know? wouldn't you just frame the shot to whatever focal length works

That's pretty much what I do.I know what I want it to look like and knowing the specific focal length doesn't do anything for me. Now, someone who is crunching numbers and trying to calculate depth of field values could use that info, so there is some reason for knowing it.
02/10/2012 11:01:03 AM · #6
Thanks Spiff, I did it at last in a little harder way. I took a few shots at various zoom level and saw their exif data in my TP. The zoom level corresponding to focal length 7mm, 10mm or 9mm are closest to what I'm looking for. Marking was not easy, but there is a min focusing range indicator in my cam, which says 7cm at focal length 7mm and 10cm and focal length 10mm. So must be in between this two :D
02/10/2012 11:03:17 AM · #7
Please upload a sample image to your workshop. Post the thumb in this forum. We can look to see if the EXIF data shows a lens focal length conversion to 35mm equivalent.
02/10/2012 11:03:51 AM · #8
Thanks to all who replied. I needed to know that just to out of curiosity. In fact I wanted to know what will be the shot like when using a standard lens. They say it looks very natural just like we see through our human eye.

Thanks again to all.
02/10/2012 07:08:14 PM · #9
When you look at the front of your lens, notice that it says 5.0mm to 60.0mm. Reviews state that the "35mm equivalents" are 28mm-336mm, so the "multiplier" is 5.6. Take whatever your EXIF says and multiply by 5.6, and that's the approximate equivalent in 35mm terms.
Keep in mind that there will not really be an exact equivalent, because the images from your camera are "squarer" than images from a DSLR. They have a 4:3 aspect ratio, whereas a DSLR has a 1.5:1 aspect ratio.
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