740 vs 760

Discussion about Night Vision Weapon Sights

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740 vs 760

Postby ncorry » Fri Mar 30, 2012 12:03 pm

WIth Gen 2 HP tubes, which is better? User friendliness, picture quality? The 4x 740 has a f1.5 lens and the 6x 760 has a f2.0 lens.
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Re: 740 vs 760

Postby marc_pril » Fri Mar 30, 2012 12:18 pm

I have looked through a fare share of units, but think more than 4x magnification is pretty useless.

Cheers,

Marc
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Re: 740 vs 760

Postby camo304 » Sat Mar 31, 2012 1:32 am

Well i would go the other way, 6x gives a more detailed picture at distance, yet will still focus down to 50 yards.
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Re: 740 vs 760

Postby efahrenholz » Sat Mar 31, 2012 1:21 pm

camo304 wrote:Well i would go the other way, 6x gives a more detailed picture at distance, yet will still focus down to 50 yards.

6x zoom only provides a clear picture if there is sufficient light. More than likely, the OP will need a laser illuminator or some other form of IR long range light. There won't be enough light available in starlight conditions for a gen 2 with an f/2 lens.
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Re: 740 vs 760

Postby camo304 » Sat Mar 31, 2012 1:29 pm

efahrenholz wrote:
camo304 wrote:Well i would go the other way, 6x gives a more detailed picture at distance, yet will still focus down to 50 yards.

6x zoom only provides a clear picture if there is sufficient light. More than likely, the OP will need a laser illuminator or some other form of IR long range light. There won't be enough light available in starlight conditions for a gen 2 with an f/2 lens.

Ye i missed the Gen2 bit :oops: buy a Gen3 :wink:
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Re: 740 vs 760

Postby Emouse » Sat May 05, 2012 2:20 pm

sorry but thats just nonsense guys,...G3 is a statement of manufacture not performance. All the DEP/PHOTONIS tubes are GEN2 in nature and can perform as good ( if not better) than the majority of lower level GEN3 US tubes.

Look at the actual tube specs ,..then decide what you need.
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Re: 740 vs 760

Postby efahrenholz » Sat May 05, 2012 5:24 pm

Emouse wrote:sorry but thats just nonsense guys,...G3 is a statement of manufacture not performance. All the DEP/PHOTONIS tubes are GEN2 in nature and can perform as good ( if not better) than the majority of lower level GEN3 US tubes.

Look at the actual tube specs ,..then decide what you need.


Actually, it's very important to mention that most new gen 2 tubes that are comparable to modern gen 3 are extremely cost prohibitive. It's far cheaper to pick up a gen 3 tube, regardless of what era it was made in, than to pick up a new photonis xd-4 or xr-5.
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Re: 740 vs 760

Postby ncorry » Mon May 07, 2012 11:00 am

Night Optics USA's Gen 2 HP tubes each use tuebs that have a resolution rating of >64 lp/mm and a MTF of 10,000. I'm just trying to figure out how much difference in picture clarity there is between the 760's f2.0 vs. the 740's f1.5
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Re: 740 vs 760

Postby efahrenholz » Mon May 07, 2012 12:41 pm

ncorry wrote:Night Optics USA's Gen 2 HP tubes each use tuebs that have a resolution rating of >64 lp/mm and a MTF of 10,000. I'm just trying to figure out how much difference in picture clarity there is between the 760's f2.0 vs. the 740's f1.5


Keep in mind that in order to determine the percentage of light reaching the tube, take 1/(F*F)*100. In your case, it would be 1/(2*2)*100, which comes out to only 25% light entering the lens making it to the intensifier. That's huge. In the case of the 740, it's 44% of the original light, so you are losing a little over half the original light. This depends on the size of the objective lens as well, as the focal length also determines the magnification (power) of the scope. If I were you, i'd pick the fastest optics you can get when buying a weapon's sight.
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