Reolink 511 vs Amcrest IP8M-2496 (5MP autofocus vs 8MP fixed)

I look like a bad cable might have killed the Amcrest IP8M-2496 I had pointed at the north yard. I was thinking I might want to swap it with a Reolink 511 anyway as I had a couple spares. With all the posts suggesting 4K (8MP) cams I thought this would be another good compare of 5MP autofocus vs 8MP. Or how rez does not make up for proper focus. Since the Amcrest died the shots are not exact compares but are from the same time on two consecutive night so damn close. Ignore the on screen times. The Reolink seems to be on PST. Bost cams were tweaked a bit to get the best looking video though not that far off default values.

The old cam is the Amcrest UltraHD 4K (8MP) Outdoor Bullet POE IP Camera, 3840x2160, 131ft NightVision, 2.8mm Lens, IP67 Weatherproof, MicroSD Recording, White (IP8M-2496EW-28MM) which according to specs has a 112 degree horizontal view angle and 0.06 Lux/F1.6(Color,1/3s,30IRE) 0.3 Lux/F1.6( Color,1/30s,30IRE) low light rating. And went for about $110 new.

The replacement is the Reolink PoE Camera 5MP Super HD 4X Optical Zoom Outdoor Indoor Video Surveillance Work with Google Assistant, IP Security IR Night Vision Motion Detection with Phone App RLC-511 which claims a 90 degree horizontal view angle but give no low light info other the 0 Lux with IR on. And as I'm writing this is going for $71 on Amazon.

First at high noon. You can see the view is a bit wider in the Amcrest though not as clear. Especially in the shadows. Note the white dog in the Amcrest shot is not easier to see than the black dog in the Reolink shot.

Amcrest at noon

Reolink at noon

Zoomed in to roughly the same section of dirt.

The Amcrest zoomed in. Note the black dog behind the white one. You might not even notice it if not looking for it.

Reolink zoomed in a bit more than the Amcrest. The black dog is almost the same spot as in the Amcrest shot though facing the other way.

How about an early morning shot just as the cam flips to color mode? In this one it is a tougher call but the Amcrest might be a bit better.

Reolink early morning

Amcrest early morning

On IR the Amcrest is better close in but the Reolink kills it in the darker areas. Note there is an IR flood on the side of the house near the dog.

Amcrest IR shot. White dog in front of tree.

Reolink IR shot. White dog on walkway near IR flood.

As a compare and to kind of take the cams IRs out of the equation here is a shot from the Reolink with the cams IR LEDs off. I wish I'd saved a similar shot from the Amcrest when I installed the IR flood.

Cheap AND good the RLC-420-5MP

Reolink PoE IP Camera Outdoor (Pack of 2) 5MP HD Video Surveillance Work with Google Assistant, Security IR Night Vision Motion Detection Audio SD Card Slot RLC-420-5MP

This just place holder for something longer later but I stumbled upon these and I'm pretty impressed. As I'm writing this Amazon has these in 2 packs for just $95.99 PLUS 15% for an actual cost of just $40.80 per! Almost the same price as a Wyze V2 with an outdoor case on it. But here you get a 5MP POE camera that does RTSP native. And better night vision of course being a cam made for outdoors. It even records audio and has the on board SD card and can send to the Reolink cloud if you should want. Note Reolink has a model D400 that is the same cam with a bit fewer vertical pixels, 1440 vs 1920 for about $5 less but why? Both are the same 2560 pixels wide 80 degree view.

The only down side might be that there is no WiFi model. The closest Reolink WiFi models are:
The RLC-422W, a dome model with 4X zoom for about twice the price
The RLC-410W, a bullet model that is only 4 MP and about half again the price.

There is also a RLC-410-5MP which is a bullet version of the RLC-420-5MP for about the same price.

Here are a couple videos to show how it performs. Both show my dogs walking about 30 feet away. I would point out an addition IR flood should really be added here. The night video is just with the in cam IR LEDs.

RLC-420-5MP night shot example
RLC-420-5MP day shot example

Here are some sample shots as well. Note the date and time are obviously WAY off. Seems my ntp server crashed and the Reolink software does not support a backup.

Me standing by the fence about 30 feet away.

White dog on about 30 feet away. If you look close you can see his teeth.

Day shot on a sunny and very windy day.

Another day shot but on an overcast day.

Doing the math on pixels per inch at a distance for your cam

If you think zoom and enhance is a real thing I have some bad news for you. You can guestimate a pixel that might come between two but that is not really adding detail. It is just making it bigger. Even with some sort of fancy AI like in No Way Out it is just going to convert the image to something like you expect to see. Like seeing faces in the clouds. Just think about it and it should be obvious, pixels can not magically resolve into something the camera did not see. The best you can do is monkey with contrast and brightness and maybe a bit motion fix if you are luck. So you need a minimum of in focus pixels snapped at a high enough shutter to reduce motion blur with enough light and or sensitivity to have the contrast to work with.

Yet I'm still seeing a lot of posts where people are talking up static focus 1080p cams with wide angle for outdoors. Let's do the math on that. There is a simple calculator online to get the width of the area being viewed by a cam with a given view angle. For example let's take my old work horse the Foscam 9800 series that is 720p and 70 deg view angle.

So at 20 feet the view width is 24.4 feet or 293 inches. 720p resolution is actually 1,280 pixels so when we divide the pixels by the view width you get  4.3686 pixels per inch. So a face, about 6 inches wide will be 26 pixels across at 20 feet with this cam. 40 is considered to be the min. So even with the best lens focused for 20 feet this is still not going to cut it.

For convenience I worked up the charts below from my compare sheet. Note these charts assume the camera is focused for the target distance and not the upscaled resolution some cams advertise. Despite claims, outdoor fixed focus cams seem to be focused at around 20 to 30 feet. You might get a "decent 2X screen grab" of targets within +- 10 feet of that. Of course for a large range of  depth you really should look at a camera with auto focus like the Reolink RLC-411WS I've tried. Though it has had the occasional glitch as well. For long distance something adjustable like the Microseven 6-22mm 3MP Manual Zoom Varifocal Len HD 1080P. Or to get an idea of what you might be able to see with a certain model in your location try IPVM calculator which lest you stick a cam on a map of your property to see what the view angle looks like and has simulated day and night shots at the distance you give.

Not those are best case numbers under perfect conditions. While 7 pixels per inch is bare min 14 is the more accepted min. If I change the wanted pixels per inch to 14 the last chart becomes

Note 12 degrees is a fairly extreme telephoto lens in the range of 22mm
70 is standard though up to 90
between 90 and 130 is often called wide angle
180 to 360 are often called 360 view cameras

For a more indepth info look here.

For a visual compare here I am about 33 feet from the cameras.
First an old Foscam FI9804PS 720p and 70 degree view angle

Now compare that with a Reolink RLC-511-5MP with auto focus but zoommed to widest view of about 90 degrees.

We can obviously see a lot more  and it looks clearer. Just for comparison here is the view from a 1080p  M7B77-WPSV1 at max zoom to a view of about 12 degrees located about 190 feet way.

The main diff appears to be the angle .

Now crop the images down to just me and the cart and make them the same size for a recognition compare. Note the sizing is done by the browser. You might interpret a bit more with a smart resize.

The Foscam image cropped

The Reolink image cropped

Lastly the Microseven image cropped.

So a 1080p cam with a 12 degree angle and focused for distance yet almost 6 times the distance away would be better for pulling a plate at the gate than the 720p with 70 degree view. Obviously the 5MP at the gate wins though probably by not as much as you would have thought. I should note here too the Foscam was only doing about 1 fps till I ran power out there so I hook up and access point via Ethernet Over Power. I did that so I could stick a Wyzecam V2 out there but that was a bust. Given its 110 degree view you get a shot like this.

First here is the Foscam from the Wyze compare test. I'm a bit further out in this one about 60 feet from the cams. You can see the zoomed Reolink image behind it. Note images were resized to match width of widest image (the Roelink).

Here is the save shot form the Wyzecam V2

And the uncovered Reolink zoomed to its max of 31 degrees horizontal.

Note the glitch in the pic turned out to be a config Blue Iris issue. Inspect sets it to be a generic RTSP and you want to set it as a Reolink.

And lastly a similar shot with the Reolink unzoomed.

In case you are wondering here are some shot with me much closer.

Foscam shot of me at the parcel box

Wyzecam V2 shot of me at the parcel box

One last distance compare back down the drive about 85 feet from the cams. Between the Microseven still zoomed the max.

And an Amcrest 4K IP8M-2496EB with about 112 degree view angle.

For those that think you can just zoom in, here is what you see if you zoom in to match the Microseven.

But there is one more factor to consider, focus. Autofocus can add a lot though when it gets it wrong it can make your cam useless too. Here is a close up shot with the Foscam where I'm just 7 feet away. The cart maybe double that.

Note the plate looks good but the logo on my cap is blurry. I'm too close for the range this cam is set too.

Here is the same shot from the Reolink zoomed out to the max.

Notice both my face and the plate are in focus because the camera has adjusted.

The down side, something flying too close to the lens can leave you looking like this.