GitUp F1 4k with 100° F2.0 lens

TonyM

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The F1 standard lens has a 160° field of view and an F2.8 aperture.

I decided to try installing a 4K 4mm F2.0 lens with 100° field of view: 4K Lens 8Megapixel Fixed M12 Small Lens 1/2.5 inch 4mm 100 Degree

1520430039883.png
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I'm pleased with the results from this F2.0 lens. It has good edge-to-edge sharpness and a decent depth of field.

Comparative frames from the F1 and my A119 (set at 1440p30).
The A119 has less motion blur (F1.8 lens and different sensor). The F1 has considerably more detail (narrower 100deg FOV and 4K sensor).

F1:
180307_F1-4mm_1.jpg
A119:
180307_A119_1.jpg

F1:
180307_F1-4mm_2.jpg
A119:
180307_A119_2.jpg

F1:A119 side-by-side (100% crops from original frames)
180307_F1_A119_1.JPG
180307_F1_A119_2.JPG
 
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TonyM

TonyM

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Night video recording at 4K with the F1 and the 4mm F2.0 lens.

Exposure and colour reproduction are good, and there's not too much detail lost to noise. Unfortunately this lens suffers badly with glare from streetlights.


180307_F1-4mm.mp4_20180308_131318.621.jpg
100% crop
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180307_F1-4mm.mp4_20180308_131609.220.jpg
 
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kamkar

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I could not imagine myself living in a new town with concrete and glass monsters all around, even London started to look bad in places, not lest since the MAX building hight was dropped / changed.

That glass sex toy shaped thing in the financial district :rolleyes:

My friends new house, while not super old, i can not walk upright in the highest places and doorways are even lower, i forsee getting a lot of bumps in the forehead visiting him, and not least new years evening when i am drunk might be a issue, already now i am thinking about getting a cheap bicycle helmet.
 
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TonyM

TonyM

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Here's another daytime video at the same junction, in much brighter conditions where the F1 shows its 4k potential.

---Video deleted---
 
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kamkar

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Yeah works good.
It can be hard with a regular 1080p dashcam to read the plates on cars 1 lane over. (y)
 

c4rc4m

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In the upper photos I prefer the A119. However. at night and in the latter very bright light video, the F1 really comes to life. The DOF and detail in the last video, is brilliant and ideal for data retrieval. I agree with Kamkar on the edge sharpness in the lower video. I'm guessing the street light issue is maybe a lack of an anti-reflection coating or maybe lack of an IR filter given that you appear to have purchased the version without.

When reading the specs, the accessory lens doesn't even appear particularly brilliant on paper. It has a distortion of almost -30%. Pretty impressive result nevertheless though. A good rectilinear lens can reduce this to about -1.5%. Must admit, 1/25" sensor doesn't help much in finding lenses. It seems to be a rarer size.
 
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TonyM

TonyM

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In the upper photos I prefer the A119. However. at night and in the latter very bright light video, the F1 really comes to life. The DOF and detail in the last video, is brilliant and ideal for data retrieval. I agree with Kamkar on the edge sharpness in the lower video. I'm guessing the street light issue is maybe a lack of an anti-reflection coating or maybe lack of an IR filter given that you appear to have purchased the version without.

When reading the specs, the accessory lens doesn't even appear particularly brilliant on paper. It has a distortion of almost -30%. Pretty impressive result nevertheless though. A good rectilinear lens can reduce this to about -1.5%. Must admit, 1/25" sensor doesn't help much in finding lenses. It seems to be a rarer size.
The seller added an IR cut filter to the lens for me. I notice that they now also list a version with the filter already applied.

I only tried this lens for a short while before going back to the original lens for aerial video. I am going to try this lens again and compare it to some of my other cameras. The night light issue may be a general issue with flare from off-centre bright lights, but apart from that it works rather well.

I have also been looking at trying a more expensive 4k 4mm lens. There are lots of low distortion 90deg rectilinear lenses, but not so many rated for 8MP or 4k. The 4k lenses seem to be suitable for sensor sizes 1/2.5 and above.

I have been waiting to see if GitUp will bring a 90deg lens out soon before buying another third party lens.
 
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