Thermal monoculars

Originally Posted By: Kirsch
As for the HD19 image and the Hogster 25, I would ask if there is someone on PM who has used them both a lot under varying conditions. I know the HD19 was a very popular model scanner. Based on what I know of older Pulsar tech and the Hogsters, I have to believe the Hogster has a better image especially in higher humidity. Is it the Phenom image, no, but still pretty darn good.

This is a HD19 I owned at one time mounted on an electric cart I built for silent running at night. I had it displayed on a screen so I could see ahead without holding the scanner to my eye.

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Looked out with my older 19a the other day when we had high humidity at a cat that was working it's way along a creek about 150 out. Temperatures and cloud cover have kept temperature gradients narrow so not a lot of difference and not much stood out but the cat did. Nice bright white. My XP28 gave more clarity to the image. Should have looked with my R25 but didn't. Was just kind of checking out the 19a as had been out in similar conditions and used both but hadn't seen anything. Under such conditions sometimes I start to doubt or think it might be going down hill but it's still holding it's own. For short to medium range detection it's pretty hard to beat with it's wide FOV. Why the narrower FOV with the 12 core vs the 17? The lens is the same correct?
 
Originally Posted By: case-nhLooked out with my older 19a the other day when we had high humidity at a cat that was working it's way along a creek about 150 out. Temperatures and cloud cover have kept temperature gradients narrow so not a lot of difference and not much stood out but the cat did. Nice bright white. My XP28 gave more clarity to the image. Should have looked with my R25 but didn't. Was just kind of checking out the 19a as had been out in similar conditions and used both but hadn't seen anything. Under such conditions sometimes I start to doubt or think it might be going down hill but it's still holding it's own. For short to medium range detection it's pretty hard to beat with it's wide FOV. Why the narrower FOV with the 12 core vs the 17? The lens is the same correct?

There are four major components that impact FOV.

Resolution: The higher the resolution, the bigger the field of view. For instance a 384 res thermal with everything else the same will have less of a field of view than a 640 thermal.

Microns: The lower the microns, the smaller the field of view given the same specs. For example a 17 µm thermal will have a bigger field of view than a 12 µm thermal with the same other specs.

Objective size: A larger objective means a larger or longer focal length which also decreases your field of view and increases magnification. For instance a thermal with a 50mm lens will have less of a field of view versus a 35mm if everything else stays the same.

Aperture An increased rating such as f/1.2 verses f/1.0 also decreases your field of view and increase the magnification.

So to answer your question when everything else stays the same and the micron number gets lower, you lose field of view and gain magnification. However, in the case of the phenom 12 µm, it also increases the image quality.
 
Reading and learning from everyone. Thanks for all input. I plan on using the scanner as my early warning system a target is approaching but will rely on the scope for identification.
It sounds like the Phenom will detect further away than the Hogster R25.
 
A night hunter friend tried the new Pulsar Helion 2 XQ38F model and compared it with the Pulsar Helion 2 XP50. Well, dear friends, listen, listen, what I am telling you is surprising. The Helion 2 XQ38F gave a better viewing impression. The explanation seems very simple: Helion 2 XQ38F has a 1024x768 amoled display against a only 640x480 display of the Helion 2 XP50. It is truly amazing that Pulsar has decided to use a low definition display on a top of the range (and price....) monocular thermal imaging camera like the Helion 2 XP50. Actually, sometimes with his technical choices, Pulsar leaves us confused ... So I give you my humble advice ... start to consider the Pulsar Helion 2 XQ38F too. It has a detection range of 1500 yards, a good FOV 10.7x8.0, a rechargeable lithium ion battery that lasts 9 hours ... and it really looks very good ... which is what matters most. ...
 
@DarkKnight- sounds like you pretty much have it nailed down to the new Bering phenom but thought I’d just throw this out there. I run a super hogster and purchased a AGM ASP TM35-384 before this season and I’m fairly satisfied with this unit so far. We hunt extreme cold temperatures in northern MN & ND and the internal battery sucks but that is the same on every thermal unit I’ve came across. Detection range is well over 1k yards and the image quality in phenomenal in my opinion. I run mine attached to a bino harness with a external battery pack and this setup works great for me.
 


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