Top Camera - Appropriate field of view?

[cdh...@gmail.com]

When is too much magnification too much?

 

I know that, for a given resolution, the higher the magnification, the smaller the field of view.

 

This is an image captured from my Top Camera (ELP) through optics that were used by the original camera on my Quad IVc.  The part is an 0805 resistor.

 

 

My feeling is that this is too small a field of view for some cases.  When locating things like fiducials, or the center points of feeder pickup points, it works great with high accuracy but, since I’m just getting started, I wonder if this is too narrow a field of view for things I might be doing in the future.

 

I know that this would be too narrow a field of view for the bottom camera because it wouldn’t be able to capture/orientate a ATMega128P (TQFP-44) but I am less familiar with the full application requirements of the top- camera.

 

I can eliminate the old optics, fabricate a new mount, and revert to the lens that came with the ELP.

 

Suggestions?

 

Regards,

 

Chuck Hackett

UP Northern 844, Mitch-Cal Shay #2

Owner MiniRail Solutions, LLC (http://MiniRailSolutions.com)

“By the work, one knows the workman”

 

[Toby Dickenson]

Yes, a larger field of view would be preferable. The yellow box in your screenshot is an overlay of the footprint selected in the "Packages" tab. For checking cad data, you want to be able to see the full footprint of larger parts. For aligning strip feeders you want to be able to see a couple of sprocket holes on the tape. Some people like a *much* larger field of view for reading barcodes on feeders.

For bottom vision that would be ok. Maybe slightly wider would be preferable, but you do not want to go much wider. It certainly doesnt need to be wide enough to see the whole atmega128 package because "composite vision" lets openpnp align by seeing one corner at a time.

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[Chuck Hackett]

Got it, much appreciated ...

Chuck