[HN Gopher] Show HN: Snap Scope - Visualize Lens Focal Length Di...
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       Show HN: Snap Scope - Visualize Lens Focal Length Distribution from
       EXIF Data
        
       Hey HN, I built this tool because I wanted to understand which
       focal lengths I actually use when taking photos. It's a web app
       that analyzes EXIF data to visualize focal length distribution
       patterns.  While it's admittedly niche (focused specifically on
       photography), I think it could be useful for photographers trying
       to understand their lens usage patterns or making decisions about
       lens purchases.  Features: Client-side EXIF data processing (no
       server uploads/tracking) / Handles thousands of photos at once /
       Clean visualization with shareable summaries  This tool supports
       most RAW formats, but you might occasionally encounter files where
       EXIF extraction fails. In such cases, converting to more common
       formats like JPEG usually resolves the issue.  Try it out:
       https://snap-scope.shj.rip/?lng=en  Source:
       https://github.com/Gumball12/snap-scope
        
       Author : kan02134
       Score  : 8 points
       Date   : 2025-01-24 14:18 UTC (8 hours ago)
        
 (HTM) web link (snap-scope.shj.rip)
 (TXT) w3m dump (snap-scope.shj.rip)
        
       | dboreham wrote:
       | Definitely a need for this. I built something similar years ago
       | from hacky scripts so nice to see it done properly.
        
       | ttoinou wrote:
       | Would you have an example of this tool being used ?
        
       | DarkSucker wrote:
       | Can anyone speak to the image processing used? In particular, how
       | is depth inferred from a single 2D image? It seems to me one
       | would need both depth and angle over the field of view to back
       | out the lens focal length. The EXIF format doesn't seem to
       | contain meta data helpful to the focal length calculation.
        
         | nanoanderson wrote:
         | There is a FocalLength tag in the EXIF spec.
         | https://exiftool.org/TagNames/EXIF.html
        
       | netsharc wrote:
       | Man, this would be so much more intuitive as a command line tool
       | that either generates a HTML file with the summary, or a CSV file
       | with filename, focal length. Dragging thousands of photos into
       | the browser window seem very sketchy (OK I just tested, Vivaldi
       | doesn't like me dragging dozens of files onto it, I can do 2
       | files, but if I try dragging about 20 files it just loads one of
       | the images, replacing the page).
       | 
       | I can imagine a CLI wouldn't even read the entire file (I have
       | 15MB heavy images), just the few KB's at the beginning to find
       | the Exif tag.
        
         | rad_gruchalski wrote:
         | Makes you wonder if you could chop the start of the file,
         | upload it, and get the result?
        
       | Cieric wrote:
       | This sounds really cool, I'm less then an amateur photographer (I
       | have a weird camera that I like writing software for.) But most
       | of my images are stripped of Exif data as others have mentioned,
       | could you provide an example on the page that I could test it out
       | with?
        
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       (page generated 2025-01-24 23:01 UTC)