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Author Topic: Puzzled Re: 30mm Tubes?  (Read 590 times)

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Offline brianrull

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Puzzled Re: 30mm Tubes?
« on: April 11, 2006, 10:54:59 AM »
Why do scope manufacturers make small objective (20mm) scopes with 30mm tubes?  

For example:
Leupold Mark IV 1.5-5x20 MR/T, 30mm
Schmidt & Bender 1.5-4x20, 30mm
Zeiss VM/V 1.1-4x24, 30mm
Burris EuroDiamond 1-4x24, 30mm

Doesn't the smaller front objective negate the benefit of a 30mm tube?
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Offline PA-Joe

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Puzzled Re: 30mm Tubes?
« Reply #1 on: April 11, 2006, 12:17:11 PM »
It's a European thing. They can only buy aluminum tubes in 30mm size. Anything larger or smaller than that can be used to enrich uranium.
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Offline brianrull

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Puzzled Re: 30mm Tubes?
« Reply #2 on: April 11, 2006, 12:22:35 PM »
Why not a 30mm minimum objective then?
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Offline 30-30man

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Puzzled Re: 30mm Tubes?
« Reply #3 on: April 11, 2006, 02:56:45 PM »
There are many products that I can't understand...The cough muffler for example.  What's next, the fart muffler?  Where would you put the tube? The wind indicator is another one that is just baby powder in a nose spray bottle.  My favorite is the processing kit that sells for $9.  It's just a pair of cheap surgical gloves and a 50 gal trash bag. :-D  They build them for suckers I guess.
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Offline oliverstacy

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I think
« Reply #4 on: April 25, 2006, 10:00:25 AM »
I'm not exactly sure but I think the 1" tubes have less than a 20mm objective lens even though they say they do.  The ones you mentioned have 30mm tubes outside diameter and have a true 20mm objective lense.  If you look at Burris's scopes I believe they have a straight 2x with a 20mm objective on a 1" tube.  If you look closely they have slightly larger bell on the front to accommodate this.

Just my 2 cents,

Josh
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Offline Brithunter

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Puzzled Re: 30mm Tubes?
« Reply #5 on: April 27, 2006, 01:43:13 PM »
Well a 30mm tube is stronger and they can fit more adjustment into it. Next in metric 1" is 25.4mm which is an odd size which is why a lot of the european scopes were actually 26mm tubed however this caused problems in places when unimformed folks screwed them into normal 1" rings and damaged the tubes :roll:

   Now to fit a true 20mm objective lens you need more space to thread the tube and then the lens carrier. Regardless of the objective size a 30mm tube will allow more light through to the eye than a 1" tube will.
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Offline killdeer

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Puzzled Re: 30mm Tubes?
« Reply #6 on: April 29, 2006, 03:40:51 PM »
Light is same same.
30mm tubes allow  more MOA adjustment.
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