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52 mm Add-on lenses and low light performance

by sunray / November 9, 2005 8:27 PM PST

I am wondering whether the low-light capability of Powershot A (15 mm dia lens) series would be improved by using the 52 mm telephoto/wideangle lenses (of good quality - with coatings etc- porbably original canon lens.) In theory,52 mm lens has atleast 9 times the area of the 15 mm lens. Hence would it improve the light gathering capability of the camera?
Has anyone experienced this? i.e. ability to use faster shutter speeds with 52 mm lens?

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Canon A series of cameras
by snapshot2 Forum moderator / November 9, 2005 11:32 PM PST

Adding a conversion lens to the front of the existing camera lens will not improve the light gathering ability of the camera lens.

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Got it
by sunray / November 16, 2005 10:58 PM PST

I think the reason probably is:-. The conversion lens has to sit very near the camera lens and light cone collected by the the conversion lens would not converge on the camera lens. Rather both act together and hence the camera lens decides the amount of light entering and in fact the conversion lens can reduce the light incident on the camera lens due to refelections etc. I am curious about one more thing: Will the teleconversion lens be concave(negative) since it has to increase the focal length along with the camera lens? (which would make the light diverge rather than converge)
Thanks for your reply

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Conversion Lens
by snapshot2 Forum moderator / November 17, 2005 8:54 AM PST
In reply to: Got it

I don't remember ever seeing a discussion on how a conversion lens interacts with the normal lens.

And I don't know where to find that type of information. I tried Google and didn't find anything that was useful.

Anyone have any ideas on this subject?????

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