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Author Topic: 60 & 80 mm lens  (Read 3569 times)

Offline gramps

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60 & 80 mm lens
« on: January 11, 2009, 01:28:09 PM »
Is there any practical difference between the 60 and 80 mm objective lens on a spotting scope?
Thanks
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Offline bobcat

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Re: 60 & 80 mm lens
« Reply #1 on: January 11, 2009, 01:35:37 PM »
Yes there's a lot of difference. The 80mm lens will be a lot brighter but it will also be a lot heavier.

Offline Red Dawg

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Re: 60 & 80 mm lens
« Reply #2 on: January 11, 2009, 05:43:37 PM »
It really depends on what you are going to be using it for. I carry mine in the pack so I elected to go with a 62mm, those 80mm are hawgs to lug around while you are hunting.

Offline HardCorpsHuntr

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Re: 60 & 80 mm lens
« Reply #3 on: January 11, 2009, 05:54:15 PM »
Noticeable difference at dusk and dawn, and larger field of view.

I spend a lot of time behind my bino's and spotting scope, so I've chosen the larger objective.  I replaced my Zeiss 65 with an 85 and have no regrets.  I'd rather pack an extra pound or two of glass than an extra pound or two from a 26" barrelled magnum rifle!  Plus, I do a lot of scoping from the house all year.
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Offline gramps

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Re: 60 & 80 mm lens
« Reply #4 on: January 11, 2009, 06:49:12 PM »
Thanks for the comments.  I don't take one with me when I am hunting, so carrying one on a hike would be without a rifle most all the time.  Have not had an oppurtunity to look at the two side by side yet.
Thanks.
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Offline ZRS-8x42

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Re: 60 & 80 mm lens
« Reply #5 on: January 11, 2009, 10:28:11 PM »
80mm or larger lens allows a slightly higher magnification power to start with. For example, you will see 15-45x60mm and 20-60x80mm scopes. When designing a scope, we try to make the exit pupil above 4mm (exit pupil= objective lens size/magnification power) so it can gather enough light.  That's why we can start with 20x for 80mm lens, while keeping it at 15x for a 60mm lens. You just have to balance the weight, power, light gathering capability when you make a decision on which one to go with.

Offline blindpig

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Re: 60 & 80 mm lens
« Reply #6 on: February 05, 2009, 01:32:11 PM »
I have swaro 60 and its plenty.

Offline JACKALL

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Re: 60 & 80 mm lens
« Reply #7 on: February 05, 2009, 05:28:46 PM »
I have a swarovski 60mm 20-60x it does a great job! I thought the 60 was better for me cause of the weight, I could not justify the 80mm weight and size for the extra light. Just buy good glass, and I don't think you will be disapointed

Offline Intruder

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Re: 60 & 80 mm lens
« Reply #8 on: February 09, 2009, 03:18:15 PM »
Huge difference in light transmission.  80s will usually cost more and weigh more too.  Not as easy to lug around in hunting scenarios. 

 


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