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High Magnification and Mirage

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 08:50
phillietimothy View Drop Down
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Hello all, I have a question about high magnification and mirage. Can a fixed power 20X scope be used in mirage conditions? Thank you.
 
Tim
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 11:37
Skylar McMahon View Drop Down
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Tim are you trying to elimainate mirage?
 
With higher magnification, mirage will be more apparent.
 
I am just not 100% sure what you are asking, would you mind elaborating more on your post to give us a better idea for the best answer?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 12:19
phillietimothy View Drop Down
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Thanks for replying. If I was using a variable, I could turn down the power to reduce mirage. How do fixed power users deal with mirage? I imagine if you had a 20X fixed power, mirage could be an issue.
 
Tim
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 12:26
Skylar McMahon View Drop Down
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Tim with a fixed power scope, you can use a sun shade or an ARD and this will help with mirage.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 12:52
phillietimothy View Drop Down
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Thanks a lot Skylar. Am I correct to assume that a 10X or 12X, be better than a 20X, in dealing with mirage?
 
Tim
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 12:53
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From what I have experienced yes.
 
Less Magnification = Less affect with mirage.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 13:28
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How will a sun shade help with mirage??  I could see if it were very long it may help with a bit of the barrel mirage if the barrel was hot, but I don't see how a sun shade will do anything for sun mirage.  A sun shade is to block stray light from coming in from the sides. 

With a 20x mirage can be very bad.  Anything about 12x IMO can show mirage pretty heavily.  A fixed 20x would not be a good choice if you plan on shooting the heat a lot.  The 16x would be better the 12x or 10x even better. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 13:33
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Some companies make barrel shields to reduce mirage due to hot barrel; however, there are only 2 cures for mirage on a hot day:
1. Less magnification
2. Wait for cooler weather


I would not recommend a fixed 20X if you have ANY concerns of mirage.

I have shot at/beyond 1000 yards with a fixed 10X, it is workable, and mirage isn't as bad.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 14:31
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Mirage may or may not be a problem depending on what you're wanting to do.  Sometimes mirage can actually be an asset, because (as long as it isn't completely obscuring your target) it can help you dope LR wind values by looking at the "flow speed" and apparent angle of heat wave movement.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 14:44
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It is a great way to read the wind, but not being able to dial down the mag when you shoot really sucks with smaller targets. 

I think Rancid said it best.  20x would be a bad choice if you are worried about ANY mirage. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 14:58
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A fixed 20X has other limitations even without mirage. It's fine if you have a rifle that you want to use in a very narrow range of conditions and don't care about FOV. Just consider whether your willing/able to limit the use of that firearm like that.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 15:13
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I was thinking that a quality fixed power could be an inexpensive way to try 600 yard F-Class. I simply can't afford a "real" F-Class scope.
 
Tim
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 15:26
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Any of the SS fixed are as good as it gets in fixed power for the money.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 17:37
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Originally posted by RotoReuter_DM RotoReuter_DM wrote:

Any of the SS fixed are as good as it gets in fixed power for the money.


Yes,I agree. every mode is over built.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 19:57
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Originally posted by phillietimothy phillietimothy wrote:

I was thinking that a quality fixed power could be an inexpensive way to try 600 yard F-Class. I simply can't afford a "real" F-Class scope.
 
Tim
That qualifies as a narrow use. You can always sell the scope off. You might also consider the 16X. For 600 yards, that's plenty of mag.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2012 at 22:18
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I just picked up a 36x for BR shooting at 500, 750, and 1000 yards.
I have been using 8-32's and even in mirage keep the power up.

For field shooting, give me a variable of around a 5-24 and I am content.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/02/2012 at 14:16
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I have been using a SS 20x for years shooting Ftr competition out to 1000 yds.  Use the natural mirage to help you dope the wind.  Use a mirage band on you bbl to help avoid the bbl mirage.  20X is about the minimun you want for F class shooting.  You will find the majority are shooting 24X on up.  Used a March X 5-50X the other day, a medium mirage day, 600 yds, used 50X, yea the target was a bit wavvy, just tried to shoot when the mirage was not boiling and when the mirage and flags showed the same direction.
Bob L.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/02/2012 at 14:20
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That's a good question supertool, and the answer is (as you are well aware) is that a sunshade won't help one iota with mirage.  All you have to do to verify this is extend the sunshade on your spotter.  In my case a kowa 884.  Set at 20x it doesn't make any difference at all with eliminating mirage.....zero.  

Originally posted by supertool73 supertool73 wrote:

How will a sun shade help with mirage??  I could see if it were very long it may help with a bit of the barrel mirage if the barrel was hot, but I don't see how a sun shade will do anything for sun mirage.  A sun shade is to block stray light from coming in from the sides. 

With a 20x mirage can be very bad.  Anything about 12x IMO can show mirage pretty heavily.  A fixed 20x would not be a good choice if you plan on shooting the heat a lot.  The 16x would be better the 12x or 10x even better. 
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