Lane

There were 19 left in stock a few minutes ago; then I ordered another (can't say no at $16). Now there are 18 left in stock...

I don't think you can see a difference in headspace from that vantage point. I was planning to measure the max neck length I could cram in some 300 Blackout builds though; and that would be done with pictures like those you took (and ideally a measuring scale). Someone else is welcome to chime in on this. But headspace is measured between the bolt face and the datum line on the shoulder of the cartridge. Even if you ended up with a bolt that doesn't close on the cartridge; the borescope view should be the same, as the cartridge is jammed up against the shoulder inside the chamber already... So that distance from the tip of the neck to the ridge in the chamber is an allowance for longer case neck. Since they stretch over time. I'm guessing based on that picture that you could probably go a hair over max length (assuming what's inside is trimmed to min length already). Even with a headspace gauge in the chamber; I don't think you can see anything of interest with the borescope. This is a pretty garbage picture of a measuring scale attached to the scope mirror. Each dot is 10 mil on center, and the rows are offset by 5 mil. Unfortunately I had to turn down the scope illumination quite a bit to see the dots though. Since it's made on a laser, I can make the dots darker, or punch all the way through; or maybe just use a different material. Kapton tape might work if it's not too reflective. I could try the laser printer again, but I wasn't fully sold on the quality of tiny printing when running yesterdays tests. I'll post back when I have a more functional setup.

Printed out a few measured scales to test the scope cameras against. Turns out I still needed to do some other pencil marking, testing; and then math. But even with the initial angular testing; I was able to estimate the same numbers calculated in the end. The Depstech focal distance appears to be almost exactly 6mm - 7mm or 0.25", and slightly beyond. The Field of View appears to be 45 degrees. The Teslong focal distance is wider, giving a focus between distances of 10mm through 13mm; 0.4" - 0.51". It also has a wider FOV angle; of around 75 degrees (maybe 82 degrees?). Should be able to attach a simple printed measuring scale to the end of the scope if one wanted those capabilities inside a bore. Might just attach it to a piece of thin stiff wire.

One could modify one of the mirror mounts for that purpose. Attach a cut piece of measuring scale, or print something out on paper and glue it on to the arm. The mirror would have to go though. If you have a thin enough piece of metal you could make a similar part; and probably get away without needed to thread it if it's going into a .308 barrel; just wrap it around the threaded part of the borescope.

I don't think I got that at all. I am sorry I didn't explain the blue "hue" to belt_fed; but no extra nonsense in my box. Just a scope.

Mostly joking. But I didn't see anything like that in my package? Where did your package come from? USPS, UPS? China?

Nope. Saw none of that. The actual reviews do occasionally mention that kind of nonsense. No free amazon for me.

I have more than a few of these USB camereas (that aren't scopes); with all the same light, and camera, and even same connectors. My device still crashes/reboots every time I try any of them. I guess I need to buy a new one. Although; the Teslong app doesn't even show up in my Google Play store for android. So. Somethings off there. It works well with USB OTG radio devices. I guess it just got pigeon-holed. Going to need a new Android tablet for using with USB cams for sure. Wasn't on my shopping list, but it is now...

This is the kind of analysis that brings me back here; day after day.

Glad you figured it out. The focus on that could be adjust a bit better, 1-2 turns perhaps. It's also easier to "see" the metal if it's not oiled up. Run a dry patch or two. (also; different calibers can be viewed more cleanly with different focus. It's really that sensitive. I'll post up some specs on both the Teslong and the Depstech when I get a chance. The focal length and the field of view angle are both different between them by a decent margin. Bet you have a lot more barrels to show us. And the dirty ones are more interesting than clean. Don't be afraid to show off a little. Bet others would appreciate it too. Show us something with corrosion pits. Something well used.

It's a standard protective coating. It peels off. Scratch it with a finger nail and then grab the edge with tweezers. Then you'll probably have to clean the actual mirror. Also; you'll have to mess around with the focus with a mirror attached. There is a threaded locking ring, and you'll need to thread the mirror in or out to change the focal point to the side of the barrel.

I was unable to get either scope to work on a phone/tablet device, no matter what I tried. It would make the tablet reboot; even with external OTG power supply. A reasonably modern Windows PC should have a Camera app in Start->Camera; which should allow you to select any USB cameras.

This would make me pretty happy. Gas rings are in fact a seal. So is everything else... I don't want passed gas hitting me, tighter fitting parts that work are a good thing.

What do you consider to be a dummy round? Did you make it yourself with no primer? If so; what do you know about other live rounds that work in comparison? Copper metal, or brass? Was it only on one side? Or in very distinct places?

In case you don't want so scroll to see the borescope compare. They are certainly different. And the cheaper one might be better for some people. Really depends on your desires. Side-by-side: $20 Depstech on the left, $45 Teslong on the right. At the very least. That FOV difference when using a mirror is a big deal. But it's not the same when shooting open scope looking down the barrel. There, the focal distance is also clearly different. *** Updated final image of a Teslong camera. Turns out that blue hue is a weird thing when white balancing the camera when inside the barrel. If you turn on the LEDs AFTER insertion it won't find a true white. You have to do it outside the barrel. Didn't have that problem turning on the LEDs inside the barrel with the $20 Depstech, seemed to "know" what white was already; or at least figure it out.

I think the answer it no; I was operating from across the room looking at a TV image of the camera, so I couldn't snap a picture. I gave it the best chances I could imagine, removed the lock ring for the side-view-mirror so I could get a further outward focal distance. Even still, with the brightest LED setting; the gas port looks like a black dot. Barely any depth of hole. I certainly didn't have enough light to be able to see inside it. I'm not sure what would happen if you could get a good light source into the other end of the gas tube though. Even a cheap laser pointer might be enough light to be able to see something. I still don't know if it would be too far out of focus to be of much value. And it would take me a bit to setup the laser scenario.

Mirrors are indeed interchangeable. I removed them both for these images. The FOV is different between cameras; the Teslong is the picture with blue hue. Both images are at max brightness of the onboard lighting. The Teslong may be limiting current to keep it from overheating and burning out the LEDs at the expense of max brightness; though that doesn't seem to be any harm in scoping a barrel. The Depstech at max brightness gets hot to the touch in seconds; and could likely runaway thermally in a few hours killing that illumination. If someone has an extra $20 to waste... They are welcome to try it.

Looks like the cheaper $20 borescope might have a lens with different Field Of View built on it; doesn't seem to be any difference in the mirrors. I'll try to figure out the actual FOV angles, and do a few shots from each scope without the side-view-mirrors when I get a few minutes to mess around.

Did my best to take the same 3 images with a side view mirror on the Depstech ($20 amazon special) borescope. I'm not entirely sure if the focus is exactly the same, but the image quality appears no different to my eye. Notable differences in the hardware: The semi-flexible part of the cable is thinner and less rigid on the Depstech model only 3.6mm diameter where the Teslong is 4.0mm and noticeably more rigid. I noticed the Depstech model immediately started getting hot; and claims a current draw of 1.0A where the USB specification only allows 500mA. That could shorten the life of, or completely kill the LED illumination if left unchecked (I guess don't leave the lights on if you're not using it). Depstech only comes with 2 mirrors, where the Teslong comes with 2 mirrors, and a 3rd mirror with built in magnet for retrieving things. Depstech; as a result of the slimmer semi-rigid part, comes in a smaller case, and can be coiled up smaller. Both borescopes have the exact same resolution of 1280 x 720. Both come with triple interface, USB 2.0, microUSB (for OTG), and USB Type-C.

Been seeing these from time to time; and CCI 50 packs. I was pissed when they had a stack of the Federal Automatch last week and wouldn't sell them to me because it was after 10PM. It's not even a rule; but most of the employees are clueless, and nobody wanted to find the keys. Of course it was all gone the next morning. Pictures of the inside of my .22LR gun from the Teslong borescope (hasn't been cleaned in a while). Near the business end (pretty clean), about halfway down I start finding little bits of unburned powder it looks like; then the leade is nasty looking. Probably should give this a good scrub down. I was bummed out at first, I stuck the camera in, and it was terribly blurry. First it was trying to use it on a slower USB port and limited to 160x120 resolution. Got that all worked out; resolution went up to 1280x720 (720p); and it was still blurry. Turns out you can adjust the mirror but unscrewing it a bit to change the focal point. That helped a lot.

It should also fit into almost every other part of a gun besides a small barrel hole... I bet it works even better for a shotgun actually. Where are all the borescope pictures anyway??

For sure. Was just messing around. You can buy fiber optic cameras and stuff that do crazy things. If he is already in your wallet; he might as well get some lab grade 4k cams.

My Teslong will be here later today. I'll be sure to test the resolution. Was knocking the resolution of Belt Fed's other Standalone/Gun Type borescope. I bet the head it too big for a lot of things. And I'm not sure his pistol grip screen in 1080p? Curious to see.... (looked sketch in the images). Wouldn't be hard to find a 4k scope; but it might not fit in .22 caliber.

No way. I think there are better options. I can't imagine that's a 1080p screen on the handheld. If you're going to get silly with the money; you might as well go 4k borescope.... And hook it to your 342" OLED TV.

Curious as well; I'll certainly post images to compare the two. Might as well start a new thread just for that.