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LARGE objective lenses

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/27/2005 at 12:51
DAVE44 View Drop Down
Optics Journeyman
Optics Journeyman

Joined: November/11/2004
Location: United States
Status: Offline
Points: 652
I know that a larger objective lens makes for a larger exit pupil and a brighter image at higher magnifications. My question is this. Does a larger objective lense (50mm) improve resoloution or clarity over a (40mm)? I looked through a Weaver Grand Slam scope in 40 and 50mm models and thought the 50mm scope was noticably more clear and the resoloution seemed more crisp. Maybe it is just me but I was very impressed by the 50mm Grand Slams Image. So would a 50mm lens be better for a long range rifle due to better resouloution?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/27/2005 at 14:27
noddah View Drop Down
Optics Apprentice
Optics Apprentice

Joined: September/06/2004
Location: United States
Status: Offline
Points: 129

If you were to test the optical focus of lenses you will find that there is a "sweet spot" in the center with the focus falling off to the edges. The easiest way of getting a bigger "sweet spot " focus from a lense is to make the lense larger.


In the indusrty I work in we use lenses in the manufacture of capture devices. In some of our devices we have three lenses to switch between to increase just what you are talking about. The increase of resolution can go up between 80% to 300% between lenses!


Now the real question: The difference between a 40mm and 50mm is an approx 20%  different in size. Would you say at the same magnification the resolution was 20% better between the two?


I would say... I would probably want to look through another example of 40mm Weaver to count out manufacture defect before I answered.

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