Talk:Telecentric lens

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[edit] Intro

I think the new intro may be too technical, and doesn't flow all that well with the rest of the article. I didn't want to just revert it back to the previous version. Perhaps it can be improved.--Srleffler 02:46, 1 May 2006 (UTC)

Your edit is an improvement. Do you think it needs more? Dicklyon 02:51, 1 May 2006 (UTC)

Yes. My concern is that an article should not start out assuming that the reader knows the meaning of terms like chief ray, aperture stop, image/object space, entrance pupil, etc. What is needed are a couple of sentences that give a reader with no knowledge of optics a sense of what a telecentric lens is, and what it might be used for. Then, the article can launch into the technical details. The previous intro at least tried to do that: it said that these lenses are used for machine vision, and explained some of the reasons why (differences between a telecentric and a regular lens). While it wasn't perfect, it was better than the current version for that. We have to remember that the reader might be, for example, a photographer who knows camera lenses but not optical design. Or an engineer who wants to learn something about machine vision but doesn't know much optical theory. Even a reader with a background in optics will appreciate a general overview before the details.

The present version also introduced some redundancy that wasn't there before. The distinction between image space and object space telecentric lenses is now explained twice, for example.

I'm not sure if the best solution here is to improve the current version or to revert back to the previous version and improve that.--Srleffler 03:03, 1 May 2006 (UTC)

OK, I'll try. My main point was to make the intro not just work for one of the two types. Dicklyon 03:07, 1 May 2006 (UTC)