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	Comments on: Optic Review: ZeroTech Trace Advanced 20-60&#215;80 Spotting Scope	</title>
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		<title>
		By: jwtaylor		</title>
		<link>https://staging.shootingnewsweekly.com/optics/optic-review-zerotech-trace-advanced-20-60x80-spotting-scope/comment-page-1/#comment-9426</link>

		<dc:creator><![CDATA[jwtaylor]]></dc:creator>
		<pubDate>Tue, 24 Sep 2024 14:46:12 +0000</pubDate>
		<guid isPermaLink="false">https://www.shootingnewsweekly.com/?p=12931#comment-9426</guid>

					<description><![CDATA[In reply to &lt;a href=&quot;https://staging.shootingnewsweekly.com/optics/optic-review-zerotech-trace-advanced-20-60x80-spotting-scope/comment-page-1/#comment-9422&quot;&gt;uncommon_sense&lt;/a&gt;.

It&#039;s not cheap, but yeah, that price is right in line with competition, plus the reticle. I also enjoy stargazing and end up often using my spotting scopes more than my telescopes because of mobility and durability.
A 60X is great if you actually want to see tiny things far away. If you don&#039;t want to see such tiny things, or so far away, you can back off the magnification.]]></description>
			<content:encoded><![CDATA[<p>In reply to <a href="https://staging.shootingnewsweekly.com/optics/optic-review-zerotech-trace-advanced-20-60x80-spotting-scope/comment-page-1/#comment-9422">uncommon_sense</a>.</p>
<p>It&#8217;s not cheap, but yeah, that price is right in line with competition, plus the reticle. I also enjoy stargazing and end up often using my spotting scopes more than my telescopes because of mobility and durability.<br />
A 60X is great if you actually want to see tiny things far away. If you don&#8217;t want to see such tiny things, or so far away, you can back off the magnification.</p>
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		<title>
		By: uncommon_sense		</title>
		<link>https://staging.shootingnewsweekly.com/optics/optic-review-zerotech-trace-advanced-20-60x80-spotting-scope/comment-page-1/#comment-9422</link>

		<dc:creator><![CDATA[uncommon_sense]]></dc:creator>
		<pubDate>Tue, 24 Sep 2024 14:04:29 +0000</pubDate>
		<guid isPermaLink="false">https://www.shootingnewsweekly.com/?p=12931#comment-9422</guid>

					<description><![CDATA[Manufacturer&#039;s suggested retail price is $1,999???  Holy Cow.  That thing better be able to spot the next new comet in our solar system!

I understand that quality glass (for the lenses) and quality coatings on all glass surfaces (which significantly increase both image brightness AND contrast) have some expense to them.  Having said that, I am having a VERY hard time justifying that $2,000 price tag in spite of using high quality glass and coatings.  To be blunt, you can purchase an outstanding astronomical telescope (which will produce equally if not superior sharp, bright, and higher contrast images) for half of that price.

By the way the idea of a spotting scope going to 60x magnification is a bad idea for the simple reason that the &quot;exit pupil&quot; will be about 1.3mm in diameter.  That means the scope will project its image onto a 1.3mm diameter circle--compared to your eyeball&#039;s pupil diameter of at least 5mm.  What does that mean in simple terms?  The image starts to get dark and you have to line up your eyeball PERFECTLY with the optical axis of the scope to see it when the exit pupil is 1.3mm.

In the optical world (speaking of all optics--spotting scopes, binoculars, monoculars, astronomical telescopes, etc.), it is generally a very good idea to use your optic such that its exit pupil is at least 4mm in diameter, which means you should limit your magnification to:  your objective lens diameter (in millimeters) divided by 4mm.  For example, if your objective lens is 80mm (such as the spotting scope of this article), you will generally want to limit your magnification to 20x (which is 80mm / 4mm).  Another example would be a rifle scope.  If your scope&#039;s objective lens is 40mm, then you will usually want to limit your magnification to 40mm / 4mm == 10x.  (Note that popular rifle scopes with 3x to 9x variable magnification almost always have a minimum object lens diameter of 40mm for that very reason.)]]></description>
			<content:encoded><![CDATA[<p>Manufacturer&#8217;s suggested retail price is $1,999???  Holy Cow.  That thing better be able to spot the next new comet in our solar system!</p>
<p>I understand that quality glass (for the lenses) and quality coatings on all glass surfaces (which significantly increase both image brightness AND contrast) have some expense to them.  Having said that, I am having a VERY hard time justifying that $2,000 price tag in spite of using high quality glass and coatings.  To be blunt, you can purchase an outstanding astronomical telescope (which will produce equally if not superior sharp, bright, and higher contrast images) for half of that price.</p>
<p>By the way the idea of a spotting scope going to 60x magnification is a bad idea for the simple reason that the &#8220;exit pupil&#8221; will be about 1.3mm in diameter.  That means the scope will project its image onto a 1.3mm diameter circle&#8211;compared to your eyeball&#8217;s pupil diameter of at least 5mm.  What does that mean in simple terms?  The image starts to get dark and you have to line up your eyeball PERFECTLY with the optical axis of the scope to see it when the exit pupil is 1.3mm.</p>
<p>In the optical world (speaking of all optics&#8211;spotting scopes, binoculars, monoculars, astronomical telescopes, etc.), it is generally a very good idea to use your optic such that its exit pupil is at least 4mm in diameter, which means you should limit your magnification to:  your objective lens diameter (in millimeters) divided by 4mm.  For example, if your objective lens is 80mm (such as the spotting scope of this article), you will generally want to limit your magnification to 20x (which is 80mm / 4mm).  Another example would be a rifle scope.  If your scope&#8217;s objective lens is 40mm, then you will usually want to limit your magnification to 40mm / 4mm == 10x.  (Note that popular rifle scopes with 3x to 9x variable magnification almost always have a minimum object lens diameter of 40mm for that very reason.)</p>
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