Free: Contests & Raffles.
i have a 30mm 3.5-14 lps, and just sold a 3.5-10 vari-xIII lr m3/cams. the 30's are great for the extra adjustment you get. the vari-x also has glass reticle. I would say for the money they are decent for a long range gun. optically they are no swaro but the leuys I have sent in were back the same month....I just got my swaro back.....I sent it in during elk season.
There is no 40mm tube. There is either a one inch tube or 30mm. The 1 inch tube is equal to 25.4mm so is slightly smaller. The objective lens is either 40mm or 50mm. The larger objective lens theoretically will let you see better in low light conditions, especially with the higher magnifications. Leupold never used to make 30mm scopes. I think they started doing so just to try to compete with the European scope makers. I'm no expert on the subject but from what I've read the 30mm tube is nothing more than a marketing gimmick. It definitely won't make any difference in how clear a prairie dog looks at 500 yards. That would only be a factor of the quality of the lenses, and the magnification. If it were me I'd just go with the 1 inch tube, but in the 6.5-20 I would go with the 50mm objective lens. In a scope for a big game rifle I would not go with more than a 40mm objective because the scope has to be mounted too high. But with the 20x magnification the bigger objective will likely be and advantage for early morning and late evening shots.
If your going to spend over $1000 then go with a Nightforce Scope. If you are spending less than $1000 then you will need to compare scopes side by side and look through them. Every piece of glass will be different. I personally would save for two years if need be to own a Nightforce. Point of Impact does NOT change with Nightforce scopes..... It does with all others.... I do not work for the company. I do own a Nightforce Scope.3.5-15X50 NXS