Third party camera

[Jacob Folkerts]

So I was looking into other lenses as I dont want to have to modify a lens if i dont have to. One i found is Lens Board for Raspberry Pi Camera, Arducam Adjustable and Interchangeable Lens M12 Module, Focus and Angle Enhancement
https://www.amazon.com/Arducam-Camera-Raspberry-Interchangeable-M12x0-5/dp/B013JTY8WY/ref=pd_rhf_se_p_img_1?_encoding=UTF8&psc=1&refRID=KSPSWTVJY486VC58BZ1F

I was told by the manufacturer that the closest focus available is 4 mm

[Jacob Folkerts]

What I'm asking is has anyone used this and what was there experience like?

[Dominique Galland]

Jacob,

First you have to choose between a camera V1 or V2, there are discussions on this point.

Then the Arducam cameras with an M12 or CS mount are a good choice because they allow to change the lens (you can see and buy directly on the Arducam and uctronics website).

Then starting from the size of an 8mm image or S8 image and the sensor size the focal length of the lens the optical calculation will give you the distance between the focal point and the film and the focal point and the sensor .
A lens with a focal length of 4mm will not be suitable because it would be much too close to the film.

Dominique

You can also see some discssion in my derived project (in french but you can google translate )
https://github.com/dgalland/yart

[Jacob Folkerts]

Sorry guess I was more scatter brained then I thought when I made this post! The lens has an adjustable focus from as close to 1 foot away at infinity to 4mm at the closest adjusted focus. I figured this would be a good camera to get as it would allow me to get closer then the recommended 2cm negating the need for a magnifier lens as I can get as close as I need to fill the frame as much as I can and then adjust focus. As well as bringing down the complexity of a the build a bit.

What I wanted to know was if anyone has used it for this project as I can't find anything about how it handles close up photography such as the entire image being in focus, color fringing, etc.

[Dominique Galland]

As a first approximation, the size of the image and the size of the sensor are approximately equal. The magnification is not much different from 1.

So the distance from the center of the lens to the image and from the center of the lens to the sensor is about twice the focal length.

The distance from the image to the sensor about four times the focal length.

For example in my case, I chose a 35mm lens:
8mm film size 4,5x3,3 mm
IMX219 sensor 3,68x2,76mm
0.81 magnification
Lens Ring Distance / Sensor 46mm
Distance Front of the lens / Image 61mm
Total distance Image / sensor 141 mm
It needs30mm CS extension rings.