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What do you gain with larger objectives

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/24/2008 at 22:09
Sparky View Drop Down
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I was looking at either a Pentax 20-60x80ED, 25-75x82ED Nikon Fieldscope or possibly the Bushnell 20-60x80ED. But after looking through a Nikon 13-30x50ED I was VERY impressed with it. Which left me wondering why I should be spending the extra money for one of the three I was considering. But I was only able to use it to about 200yds. I shoot regularly to 400yds and occationally to 600yds. But I am not sure if the smaller objective size would hurt me at those ranges. Most of my buddies are using 80mm Swarovski or 85mm Zeiss spotting scopes. What am I going to gain with a larger objective size?

Thanks for you help.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/24/2008 at 22:41
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In simple terms you will be able to take better advantage of the higher magnification with out losing the exit pupil. Which in short means a brighter sight picture. Everything else being equal ofcourse.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/25/2008 at 00:06
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We've been using an 80mm this year at camp spotting deer on the mountain side up to 1300+  yards and it's a huge difference from the 60mm spotter we were using in years past. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/25/2008 at 13:44
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In the 80mm scope (assuming comparable quality) you will get:

Pros
a brighter image
greater resolving power
the ability to use higher magnifications

Cons
a scope that is physically much larger
a scope that will weigh much more
the need for a larger/more stable tripod

Whether or not the overall difference is important enough to matter is up to you. I am regularly being impressed by the quality of the image I get from my little 50mm Leupold Golden Ring.  The Nikon ED50, with its inclusion of ED glass elements, will undoubtedly prove to be even a bit better.  I know of a fair number of people who have all but retired their large 60-80+mm scopes in favor of the little Nikon.  (Though, to be fair, I should point out that most of them do little if any true low-light viewing which is when the larger scopes really show their value.)

Originally posted by mike650 mike650 wrote:

We've been using an 80mm this year at camp spotting deer on the mountain side up to 1300+  yards and it's a huge difference from the 60mm spotter we were using in years past.
  While I don't doubt what you're saying is true, it should be noted that what you've experienced could be due more to the comparative quality of the two scopes in question, rather than to strictly the objective lens size.



Edited by lucznik - August/25/2008 at 13:46
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/25/2008 at 14:12
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Originally posted by lucznik lucznik wrote:

In the 80mm scope (assuming comparable quality) you will get:

Pros
a brighter image
greater resolving power
the ability to use higher magnifications

Cons
a scope that is physically much larger
a scope that will weigh much more
the need for a larger/more stable tripod

Whether or not the overall difference is important enough to matter is up to you. I am regularly being impressed by the quality of the image I get from my little 50mm Leupold Golden Ring.  The Nikon ED50, with its inclusion of ED glass elements, will undoubtedly prove to be even a bit better.  I know of a fair number of people who have all but retired their large 60-80+mm scopes in favor of the little Nikon.  (Though, to be fair, I should point out that most of them do little if any true low-light viewing which is when the larger scopes really show their value.)

Originally posted by mike650 mike650 wrote:

We've been using an 80mm this year at camp spotting deer on the mountain side up to 1300+  yards and it's a huge difference from the 60mm spotter we were using in years past.
  While I don't doubt what you're saying is true, it should be noted that what you've experienced could be due more to the comparative quality of the two scopes in question, rather than to strictly the objective lens size.



No problem and your right we did upgrade our optics, no reason to downgrade. The larger objective for our situation....ranging and profiling from 1300+ yards, during typical low light hunting conditions, going to an 80mm was the best call. The area we hunt, we won't be packing it around very often. Wink

Looking at Sparky's post again, it appears he'll be spotting half as far and possibly packing it so a smaller objective would be great. I got caught up in what he said his friends were doing. Smile


Edited by mike650 - August/25/2008 at 14:27
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/26/2008 at 11:11
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Cyborg, Mike650 and Lucznik,

Thanks for taking the time to answer my post.

When I look back on my post I realize that I left out that I spend the majority of my time at the range. And that I shoot regularly to 400yds and occationally to 600yds at paper with either my .223 or .308. This would be the primary use for my spotting scope.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/26/2008 at 11:24
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The image resolution is the real thing that you will want for that purpose. A 60mm with good mag and very good glass will do exactly as you want. Naturally an 80mm would do a bit better if the glass is equal. It will cost more though. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/26/2008 at 17:18
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Is anyone of these scopes what you would consider very good glass Pentax 20-60x80ED, 25-75x82ED Nikon Fieldscope or Bushnell 20-60x80ED? Or would I need to step up to one of the big three? I would prefer to buy the right scope the first time and not have to upgrade later. But I also am not looking for a status symbol either.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/26/2008 at 20:00
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Any of the three you mention would definitely qualify as very good glass.  A step up in quality would require a very hefty premium.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/27/2008 at 06:15
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I agree the three that you have listed are going to be a very good compromise for getting high performance on a budget. Relatively speaking that is.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/05/2008 at 18:45
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Cyborg, Mike650 and Lucznik,

Thanks for taking the time to answer my post.

And after rereading comments on other post about the three spotting scopes I was concidering I decided to go with the Pentax PF 20-60x80ED A. Although I did think really really hard about the Bushnell.

Once again thanks very much for you help.


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/05/2008 at 19:09
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Sweet, excellent choice!!

Let us know what you think after playing with it a few times.  Big%20Smile
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/05/2008 at 23:06
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Will do.
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