#303382 - 07/17/07 09:06 PM
Which Fresnel Lens? BSK? Anyone?
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Wes Parrish
16 Point
Registered: 06/12/02
Posts: 16993
Loc: Knoxville-Dover-Union City, TN
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Fresnel lens are available in .65 or .90.
You can choose the .65 fresnel lens which will allow for detection at distances up to 90 feet or the .90 fresnel lens which will detect out to about 60 feet but has a wider detection zone. The detection zone for the .65 is about 3 feet at 25 feet where the .90 will have a detection zone of 15 to 18 feet wide at that distance.
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#303678 - 07/18/07 06:36 AM
Re: Which Fresnel Lens? BSK? Anyone?
[Re: Wes Parrish]
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BSK
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Depends on which camera you are using. A P41 is so fast you don't need the wide-angle. If you're using a slower camera, such as an S40 or S600, then use the wide-angle.
_________________________
"Know where you stand, and stand there" --Jesuit Father Daniel Berrigan
"There is no reasoning someone out of a position he has not reasoned himself into." --Clive James
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#303738 - 07/18/07 07:33 AM
Re: Which Fresnel Lens? BSK? Anyone?
[Re: BSK]
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Wes Parrish
16 Point
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Loc: Knoxville-Dover-Union City, TN
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Thanks BSK.
But since I've already got the first P41 with the .90 wide angle detection zone, going to look forward to seeing the pics when a big buck trails a hot doe across its FOV, and the cam is set to take pics every 5 seconds.
I'm thinking with this .90 set-up, it will be fine to set the cam perpendicular to trails rather than angled down them? Wouldn't that get more pics on trails?
An even better idea:
Let's get OutdoorBob to build one with dual fresnel lens both simultaneously working!  Then you could have the best of both.
Can you do that Bob?
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#303752 - 07/18/07 07:51 AM
Re: Which Fresnel Lens? BSK? Anyone?
[Re: Wes Parrish]
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BSK
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With a P41 you can already set them perpendicular to trails. With a 1 second trigger time, that is fast enough to catch them on a perpendicular set-up.
That said, the wide-angle will catch them even faster. The only down-side is loss of distance sensing. But at night the SSS board PIR sensor is so sensitive, it will pick up deer far beyond the range of the flash, which will give you about 50 feet of illumination. So lessening distance sensing to about 60 feet really isn't a problem.
_________________________
"Know where you stand, and stand there" --Jesuit Father Daniel Berrigan
"There is no reasoning someone out of a position he has not reasoned himself into." --Clive James
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#304561 - 07/18/07 07:06 PM
Re: Which Fresnel Lens? BSK? Anyone?
[Re: BSK]
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outdoorbob
10 Point
Registered: 09/09/06
Posts: 3011
Loc: Grundy County
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Well I'll start by saying I'm a .90 fan so my answer will be tainted a little. BSK is right about everything he has said. The P41 is so fast it will enough to get almost all deer. It might miss trotting deer or deer extremely close to the cam who walk by, as the detection cone is really small closer to all trail cams. The .90 will just pick up these movements quicker. The negative is the lesser sensing distance. How much it is lessened I'm not sure. Expecially since Gary has updated his boards and there is now an "Extra High" sensitivity setting. I've tested the WA out to 60 ft. in 90 degree weather and it senses with no problem and that's on high. On "Extra High" I think it will be out to 80 to 90 feet "if" the fresnal lens is centered correctly over the PIR. One of my best investments in my business is a laser which allows me to center the fresnal sweetspot precisely over the PIR. I just retrieved 3 cams with over 800 pics and you would be amazed at how many of them have the deer in the first 1/3 of the pic. But at least I'm getting the front half of the deer and not the back half.
As to putting both fresnel, I don't think that one is possible, yet.
_________________________
Use a trailcam and make it deer season year around.
GO VOLS!!!!!!!
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#304985 - 07/19/07 06:48 AM
Re: Which Fresnel Lens? BSK? Anyone?
[Re: outdoorbob]
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BSK
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Cool information OutdoorBob7.
_________________________
"Know where you stand, and stand there" --Jesuit Father Daniel Berrigan
"There is no reasoning someone out of a position he has not reasoned himself into." --Clive James
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#305104 - 07/19/07 08:39 AM
Re: Which Fresnel Lens? BSK? Anyone?
[Re: BSK]
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Wes Parrish
16 Point
Registered: 06/12/02
Posts: 16993
Loc: Knoxville-Dover-Union City, TN
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I think for the main purposes I'll be using this P41, I am better served by the .90 lens. I have plenty of slower-triggering cams for other purposes, but this P41 (with its fast trigger) will be used on trails. It would appear the .90 lens would be more likely to get multiple pics, say if a doe came running by being pursued by a buck?
Particularly appealing for trail monitoring is the P41 being able to take a high resolution pic every 5 seconds, while most commercial digitals need a minimum of 60 seconds to reset for the next pic. In 60 seconds the buck chasing that doe can slip by without getting his pic taken.
Will be interesting to see how the P41 compares to the DC-200's (what I have been mainly using for trail monitoring), which have a faster trigger speed than even the P41 and are also capable of taking several pics inside a few seconds.
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#305257 - 07/19/07 10:08 AM
Re: Which Fresnel Lens? BSK? Anyone?
[Re: Wes Parrish]
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BSK
Jerkasourous of the non-typical kind
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Wes,
In daylight, two pics 5 seconds apart may be a reality. But from experience I can tell you that at night the fastest the camera can recharge the flash capacitors is around 10 seconds, and if the batteries are getting weak, about 12 seconds.
_________________________
"Know where you stand, and stand there" --Jesuit Father Daniel Berrigan
"There is no reasoning someone out of a position he has not reasoned himself into." --Clive James
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#305382 - 07/19/07 11:51 AM
Re: Which Fresnel Lens? BSK? Anyone?
[Re: BSK]
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Wes Parrish
16 Point
Registered: 06/12/02
Posts: 16993
Loc: Knoxville-Dover-Union City, TN
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. . . from experience I can tell you that at night the fastest the camera can recharge the flash capacitors is around 10 seconds, and if the batteries are getting weak, about 12 seconds.
Well other than the old Dc-200's, that will still beat the stink out of anything else I have --- most everything else is rated for "1 minute" but actually takes over a minute, although the Leaf River will usually get one extra pic inside 30 seconds to a minute after the first.
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#305397 - 07/19/07 11:58 AM
Re: Which Fresnel Lens? BSK? Anyone?
[Re: Wes Parrish]
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BSK
Jerkasourous of the non-typical kind
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Registered: 03/11/99
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Loc: Nashville, TN
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For the life of me, I can't understand why the commercial cams take so long to write files to the memory card. My $300 digital camera while right a true 10.1 Megapixel photo to a memory card in 1 second.
_________________________
"Know where you stand, and stand there" --Jesuit Father Daniel Berrigan
"There is no reasoning someone out of a position he has not reasoned himself into." --Clive James
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