03-14-2005, 19:16
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#1
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Guerrilla
Join Date: Feb 2004
Location: New Brunswick Canada
Posts: 181
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I readed somewhere that there is an ideal magnification(more light being focused) for night shooting?? Am I wrong??
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Desert Fox is offline
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03-14-2005, 21:04
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#2
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Guerrilla
Join Date: Feb 2004
Location: New Brunswick Canada
Posts: 181
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Quote:
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Originally Posted by longrange1947
Desert Fox - What you are talking about is matching the exit pupil of the scope with your pupil size. Divide the Objective lens in mm by the power fo hte scope and you have the exit pupil. As an example 50mm divided by 8x equals 6.25mm, this would be slightly smaller then your pupil at night so you would have a hard time locating the true center axis of your lens. Go too large and you are wasting light on other than your pupil.
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So the larger the Objective lens the better it is for night??
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Desert Fox is offline
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03-14-2005, 21:23
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#3
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Quiet Professional
Join Date: Jan 2004
Location: Free Pineland
Posts: 24,810
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Quote:
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Originally Posted by Desert Fox
So the larger the Objective lens the better it is for night??
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Negative.
1. There is an overkill if the ratio exceeds the 7mm measurement or so.
2. Magnification is also a factor, larger objectives may not be able to compensate for extreme mag, there is a practical limit.
TR
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"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat." - President Theodore Roosevelt, 1910
De Oppresso Liber 01/20/2025
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The Reaper is offline
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03-15-2005, 16:56
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#4
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Guerrilla
Join Date: Feb 2004
Location: New Brunswick Canada
Posts: 181
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Quote:
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Originally Posted by The Reaper
Negative.
1. There is an overkill if the ratio exceeds the 7mm measurement or so.
2. Magnification is also a factor, larger objectives may not be able to compensate for extreme mag, there is a practical limit.
TR
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Ok!
The larger the obj lens, the higher will be the optimal zoom??
i.e. :
100mm/7mm = 14x optimal
50mm/7mm = 7x optimal
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Desert Fox is offline
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03-15-2005, 17:46
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#5
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Quiet Professional
Join Date: Jun 2004
Location: Occupied Pineland
Posts: 4,701
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Quote:
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Originally Posted by Desert Fox
Ok!
The larger the obj lens, the higher will be the optimal zoom??
i.e. :
100mm/7mm = 14x optimal
50mm/7mm = 7x optimal
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Must be strong - Must learn to resist temptation! BMT - This one's an approved target for a closed sheaf. DF - Either you're not asking good questions, or your purpose is too obscure for us to give you the right answers. Re-read the previous posts from LR1947, TR, and myself. Anything more or less than (approximately) a 7mm exit pupil doesn't take advantage of the light focusing capability of the optics - it either isn't enough or it wastes light. Have you ever seen a pair of ship's binoculars with the large objective lenses to gather maximum light and the magnification to create the right sized exit pupil? The latest versions have to be mounted on a pedestal and have special stabilization built in just to be useable. You don't want to know the price tag. Once you get above 7x stabilization and eye fatigue start becoming major problems. That's why nobody makes handheld optics above 10x. You can use some of the smaller astronomical scopes if you want maximum objective size but you'll need low power (relatively) eyepieces and it's not a portable solution.
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Peregrino is offline
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03-15-2005, 17:48
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#6
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Quiet Professional
Join Date: Jan 2004
Location: Free Pineland
Posts: 24,810
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Quote:
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Originally Posted by Desert Fox
Ok!
The larger the obj lens, the higher will be the optimal zoom??
i.e. :
100mm/7mm = 14x optimal
50mm/7mm = 7x optimal
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www.google.com
I am tired of trying to explain it to you.
TR
__________________
"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat." - President Theodore Roosevelt, 1910
De Oppresso Liber 01/20/2025
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The Reaper is offline
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03-15-2005, 18:49
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#7
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Quiet Professional
Join Date: Jan 2004
Location: LA
Posts: 1,653
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Desert Fox, you will learn a lot more if you just read. You are interrupting.
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