The B+W Push-On Lens Cap #300 model is their 'standard' unit, and has a slightly convex front surface to prevent the inside of the cap from touching the glass of your lens when it is tucked away in a bag. The sides are their 'standard' depth, to fit on normal lens barrels or standard-style filters, and this particular unit has a 37mm inner diameter.
B+W also makes a 'shallow' sides model, the #305 model, to fit on slim filters, and a more common snap-on cap.
It isn't an exact science due to all the variables involved, but generally a push-on cap that is 2-3mm larger than the lens' filter size fits just right.
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Comments about B+W #300 37mm Push-On Lens Cap:
The 37MM cap looks OK butwill not fit my Olympus
14-42mm, 37mm lens. It would work with the lens
alone or with a filter on it.
Pros
Cons
Best Uses
Comments about B+W #300 37mm Push-On Lens Cap:
I brought it based on the review, but I was wrong this cap doesn't fitted my 37mm Canon camcorder lense. I guess you need one size bigger. So, instead to return it, it ended up in my garabge can.
Comments about B+W #300 37mm Push-On Lens Cap:
I only bought it because I could not find a snap-on lens cap in this size. It does the job.
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