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#390304 - 09/10/07 04:08 PM Riflescope Objective Lens Sizes
gil1
12 Point


Registered: 04/06/07
Posts: 6339
Loc: Nashville, TN

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Please excuse me if this topic has been discussed. I did a search and couldn't find it.

A friend was recommending a riflescope, and he has 3 deer scopes that are 3x9x50. I'm in the market for a new scope but had planned on buying one with a 40mm objective lens. He said he loves the ability to get another 10 minutes of light out of the day. I would love the bonus light and was set to buy a 50mm.

I was doing some research on opticsplanet.net and found this recommended reading by the dealer on how to choose a scope. Below is the part that mentioned the negative aspects to a bigger objective lens. I really don't know what to do or who to trust. I would greatly appreciate some suggestions. Thanks in advance.

How to choose a scope link

Here's the important quote from the article...

"Let’s talk about objective lens sizes. 40 to 44mm is pretty standard on a medium variable rifle scope. It’s trendy these days to have large objective lenses of 50, 56, or even 75mm in some cases. In most cases, these are unwarranted, and the largest ones are laughable. Large objective lenses will only transmit more useable light than smaller ones if they are set at their highest power in the dimmest conditions. The detriment is comfort and ease of eye alignment. With a properly mounted scope, you should be able to close your eyes, shoulder your gun with a proper, repeatable stock weld (a stock weld is the firm but comfortable and repeatable position of your face on the gun stock), open your eyes, and look directly through the center of your scope every time. Large objective lenses prevent this from happening because of the ring height required to keep such a large lens off your gun barrel. Some scopes require such high mounting that only your chin touches the stock. These scopes are also heavier, clumsier, unwieldy, unbalanced to carry, slower and less comfortable to shoot. Some of these scopes weigh up to an unbelievable 3.5 pounds!"
_________________________
It is not the killing ...; it is the contest of skill and cunning. The true hunter counts his achievement in proportion to the effort involved and the fairness of the sport.

Dr. Saxton Pope

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#390347 - 09/10/07 04:35 PM Re: Riflescope Objective Lens Sizes [Re: gil1]
mr.big
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Registered: 01/03/01
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Loc: Copper Head Road

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LENS QUALITY wins out every time,,I have a couple of 40 mm Ziess Conquests that are brighter at dark than the 50 mm on the couple of Vari-x III`s I have.

I have sit out here behind the house at dark and can read the 100 yard target a good 4-5 minutes longer with the Ziess than the Leupold,,it aint all about size.
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#390350 - 09/10/07 04:40 PM Re: Riflescope Objective Lens Sizes [Re: mr.big]
gil1
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Registered: 04/06/07
Posts: 6339
Loc: Nashville, TN

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Thanks, Mr. Big. If you had to choose between the 40mm lens and 50mm lens on the exact same scope, though, which would you choose? I guess that's my question.
_________________________
It is not the killing ...; it is the contest of skill and cunning. The true hunter counts his achievement in proportion to the effort involved and the fairness of the sport.

Dr. Saxton Pope

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#390358 - 09/10/07 04:50 PM Re: Riflescope Objective Lens Sizes [Re: gil1]
PMC, certified
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Registered: 11/11/02
Posts: 8741
Loc: Nashville, TN

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the answer is, it depends \:D a 3x9x40 has an exit pupil (obj size / Magnification) from 13 down to 4.45. A 3x9x50 is 16.67 to 5.56. IIRC the max the human eye can handle is 7 in pure darkness.

A 50 will be mounted higher, so how does that impact the cheeck weld and your shooting, only you can know that.

What scope are you looking at and what gun will it be mounted on?

Pmc®


Edited by PMC® (09/10/07 04:51 PM)
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Beating Back Ignorance Since 2002

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#390385 - 09/10/07 05:19 PM Re: Riflescope Objective Lens Sizes [Re: PMC, certified]
4onaside
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Registered: 02/07/06
Posts: 5125
Loc: Jackson,Tn

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gil,the conversation reminds me of when the late Jim Varney was a regular on Buckmasters with the HUGE(fake) black scope mounted on his rifle. A joke, of course, in that situation, but it is kinda the point your article makes, there is a size limit of practicality. I've owned larger objective lens, but have never seen much difference in them and 40mm under hunting conditions. As PMC points out, the amount of light entering your eye from the exit pupil is the key, not the amount of light coming into the Objective lens. IMO 40mm's are good as gold during legal shooting hours. However, its fun trying tweek all of your equipment into giving yourself every possible edge. LOL
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Not my circus, not my monkeys.
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#390387 - 09/10/07 05:24 PM Re: Riflescope Objective Lens Sizes [Re: PMC, certified]
gil1
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Registered: 04/06/07
Posts: 6339
Loc: Nashville, TN

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I'm pretty much at a loss. It's for my 30.06 Remington 700. I want a decent scope that's not out of my price range ($200-$300) and have no experience in the matter.

My old scopes are really cheap, and I want an upgrade. I had been hunting all deep woods (max 75 yard shots), but now I've got a lease where it's more open, and I'd like to expand my range and at least practice out to 150-200 yards.

From reading through the posts on here, I was looking at Nikon Prostaff, Simmons ATEC, Burris Fullfield 11, Bushnell 3200 Elite, Swift Premier, etc. My buddy had recommended the Nikon Buckmaster with the 50mm objective lens.

I've got to pull the trigger (pun intended) soon so I can get some practice in before rifle season so I can see at what range I'm comfortable shooting. Any thoughts on my particular situation? Thanks again in advance.
_________________________
It is not the killing ...; it is the contest of skill and cunning. The true hunter counts his achievement in proportion to the effort involved and the fairness of the sport.

Dr. Saxton Pope

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#390390 - 09/10/07 05:27 PM Re: Riflescope Objective Lens Sizes [Re: 4onaside]
gil1
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Registered: 04/06/07
Posts: 6339
Loc: Nashville, TN

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 Originally Posted By: 4onaside
gil,the conversation reminds me of when the late Jim Varney was a regular on Buckmasters with the HUGE(fake) black scope mounted on his rifle. A joke, of course, in that situation, but it is kinda the point your article makes, there is a size limit of practicality. I've owned larger objective lens, but have never seen much difference in them and 40mm under hunting conditions. As PMC points out, the amount of light entering your eye from the exit pupil is the key, not the amount of light coming into the Objective lens. IMO 40mm's are good as gold during legal shooting hours. However, its fun trying tweek all of your equipment into giving yourself every possible edge. LOL


I can see Ernest now. LOL
That's what concerns me. I've been hunting a long time but have never really gotten too cutesy with my setups. I don't have enough knowledge to take risks on my equipment. Heck, I just want something I can work with and don't want to spend a bunch of money on a mistake.
Ya know what I mean, Vern?
_________________________
It is not the killing ...; it is the contest of skill and cunning. The true hunter counts his achievement in proportion to the effort involved and the fairness of the sport.

Dr. Saxton Pope

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#390487 - 09/10/07 06:51 PM Re: Riflescope Objective Lens Sizes [Re: gil1]
4onaside
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Registered: 02/07/06
Posts: 5125
Loc: Jackson,Tn

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 Originally Posted By: gil1
 Originally Posted By: 4onaside
gil,the conversation reminds me of when the late Jim Varney was a regular on Buckmasters with the HUGE(fake) black scope mounted on his rifle. A joke, of course, in that situation, but it is kinda the point your article makes, there is a size limit of practicality. I've owned larger objective lens, but have never seen much difference in them and 40mm under hunting conditions. As PMC points out, the amount of light entering your eye from the exit pupil is the key, not the amount of light coming into the Objective lens. IMO 40mm's are good as gold during legal shooting hours. However, its fun trying tweek all of your equipment into giving yourself every possible edge. LOL


I can see Ernest now. LOL
That's what concerns me. I've been hunting a long time but have never really gotten too cutesy with my setups. I don't have enough knowledge to take risks on my equipment. Heck, I just want something I can work with and don't want to spend a bunch of money on a mistake.
Ya know what I mean, Vern?
Yeah, I do Ernest!
I'm probably out of line even talking to you on the serious side of scopes, because for many years I have bought the cheapest Bushnell scopes available, usually Sportviews,and even Tascos on occasion, because of adequate quality and few dollars, and have been just as happy as a pig in mud with them. I just never have found any brighter optics than Bushnell(of course, I haven't looked too hard when the dollars go up!). That's what works for me, and when someone starts talking two or three bills for a scope,they have lost me in the shuffle. Incidentally, these el cheapo scopes work like a champ on the high plains or in alpine meadows also for 225 to 300 yard shots. But hey, what do I know! Good luck in finding what works for you. After all, that's the bottom line.
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Not my circus, not my monkeys.
Polish proverb

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#390507 - 09/10/07 07:09 PM Re: Riflescope Objective Lens Sizes [Re: 4onaside]
paincave_2000
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Registered: 08/21/05
Posts: 2567
Loc: Bedford Co.

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Get the Bushnell 3200,it should do everything you need.
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#390525 - 09/10/07 07:22 PM Re: Riflescope Objective Lens Sizes [Re: paincave_2000]
TiminTN
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Registered: 06/18/00
Posts: 6333
Loc: Memphis,Tennessee U.S.A.

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I think the best "cheap" scope is a Burris FFII. I`d throw a Weaver Grand Slam in there but it is much more money.

I`d throw a down payment and do a short lay-a-way for a Zeiss Conquest 3-9x40 if it were me.

We are talking serious business here now.
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