C-mount lenses on smartphone

[Cosimo]

 

[Cosimo]

 

 

[PannySVHS]

One inch S16 sensor estate on that phone? That would mean Super16 4K raw for 400 Euro if I got that right. Could the 1" 20MPix sensor be the well tested sensor of the RX10/100 series? I am pretty happy with the colours in photo Raw on my LX15 which also sports that Sony 20Mpix imager. Pretty sweet! Thanks for posting! @Cosimo Is there a more detailed instruction video how to do this mod?

 

[Andrew Reid]

An interesting mod, looks irreversible - but still worth it.

The Xiaomi 12s ultra would be a good candidate for this too.

 

[PannySVHS]

How about the 11 ultra? @Andrew Reid It sports a 1/1.2" sensor, so still 16mm territory and worthy of C-mount lenses imho. Waiting for a tutorial of the mod and more raw video to see what the Aquos R6 is capable of.

[Emanuel]

These guys already have it on small form factor:

https://www.youtube.com/@BACKBONEca/videos

 

Pity no option for the best of them (Insta360 Ace Pro) too so far...

[Andrew Reid]

12 hours ago, PannySVHS said:

How about the 11 ultra? @Andrew Reid It sports a 1/1.2" sensor, so still 16mm territory and worthy of C-mount lenses imho. Waiting for a tutorial of the mod and more raw video to see what the Aquos R6 is capable of.

The Xiaomi 11 Ultra, yes. Superb video quality.

Superb sensor.

It would be a very good candidate, but the ergonomics are never going to be great with a hefty (by smartphone standards) piece of glass on the front.

[PannySVHS]

2 hours ago, Andrew Reid said:

It would be a very good candidate, but the ergonomics are never going to be great with a hefty (by smartphone standards) piece of glass on the front.

True.

I should install ML Raw on my Eos M instead of wondering about these kinda options. Og pocket would be perfect without overheating when powered by internal batteries. I had a lot of fun with it this hot summer despite missing some nice shots.:)

Watching youtube reviews of smartphones is such a dull affair. How is focussing with dedicated apps from Blackmagic or Mcpro24fps? What a silly name for the later.:) How is the general experience for video regarding handling, battery life and overheating when using these video apps or motioncam?

I hope these question don't distract too much from the topic of this thread.

Kye had his gopro modded with d-mount lenses iirc. @Emanuel

 

[Andrew Reid]

I still think if the uncompressed true raw look is what you're after... get the Sigma Fp-L with an SSD and set it to 2x crop mode.

Digital Bolex / Magic Lantern without the hassle!

[PannySVHS]

Some day I might just do that. @Andrew Reid Great option. I was not very intrigued by it as a photo camera when I had a chance to snap a few shots with it, missing some tactility and the mechanical shutter. But as a pocket cine cam, capable of raw recording and without thermal issues it is compelling. I still "smell" the Sony sensor though from the footage online, just like from the S1 and S1H, which I both own. Maybe raw will solve my issues I am having with the color from this sensor / video processing under natural light, which I find rather boring.

Why would you use a 2x crop? Does the FP have the 3x crop of the Lumix S series? A true S16 mode would be awesome. It would even allow for some downsampling.

[Cosimo]

On 9/27/2024 at 10:23 PM, PannySVHS said:

Is there a more detailed instruction video how to do this mod?

Hey, yes, the guy will post a tutorial video on how to mod the phone to place c mount lens, thanks for asking. I am also trying it, waiting for some parts to arrive.

[maxJ4380]

i looked at the conversion some time ago for a gopro, however the 5x crop for the 35mm wasn't what i was after and i wasn't interested in starting a cs mount collection. The following is taken from the backbone sight

What Lens Should I Buy?

That’s probably the most common question we get asked and it depends on what you are looking to do with the camera. For reference the standard GoPro lens is 2.8mm, so 3-12mm are good for wide/medium shots. 16mm – 25mm are great for closeups with soft backgrounds and longer lenses are great for zoom and telephoto. Before getting into details, first let’s look at the different lens types that the Ribcage supports without the need for an adapter.

M12

Also known as ‘S-Mount’ or ‘Board lenses’. They are lenses similar in size to the original GoPro lens. Typically these are best used for applications requiring small size and weight such as use with small drones and gimbals. This lens type typically has a fixed focus and fixed iris so they are meant to be set up once and locked in.

CS-Mount

These attach to the large mounting ring on the camera. CS-Mount was developed mostly for security applications so there are thousands of ultra sharp high megapixel lenses available at a relatively low cost. This lens type also commonly has ‘IR-Corrected’ or ‘Day&Night’ capability. That means they can focus on Infrared and visible light at the same time which a normal lens can’t.

C-Mount

C-Mount was originally developed in the 1920’s for film cameras and has been in use ever since. These can be attached to the camera by attaching the 5mm spacer ring. There are a vast array of C-Mounts available as they were commonly used on home movie cameras in the 50’s and 60’s, security and TV cameras and now for machine vision, factory automation and inspection applications that require the highest quality optics. You can buy vintage or new!

While you can connect any M12, CS or C-Mount lens, 1/2.3″, 1/2” and 2/3” lenses are best. The value in inches simply tells you the size of the image sensor the lens was originally designed for. The GoPro uses a 1/2.3″ sensor. Ribcage has a crop factor of 5.6x for 35mm SLR lenses, so wide angle lenses are generally more useful.

1/2.3”, 1/2”, 1/1.8” and 2/3” M12, CS-Mount and C-Mount lenses are ideal.

1/2.5” lenses are ‘technically’ slightly too small for the sensor but in most cases give complete coverage and excellent results.

1/3” or 1/4” lenses are too small for the sensor to be used in wide mode, although they can still be used with the camera’s ‘medium’ and ‘narrow’ shooting modes.

Auto iris lenses are not recommended as they require an external power supply in most cases.

Focal lengths ranging from 4mm up to 25mm will prove to be most useful for general shooting. Focal lengths under 4mm will have a similar or more pronounced fish-eye effect than the stock GoPro lens unless they are labelled ‘rectilinear’ or ‘low distortion’.

We’ve found it best to use lenses labelled ‘HR’ or ‘Megapixel’ for HD shooting. 3MP, 5MP and 10MP lenses should produce outstanding results.

If you want to use the optional night vision feature of the Ribcage, IR corrected or D&N (day & night) lenses are recommended. These lens types allow IR and visible light to be in focus at the same time.

Only lenses with manual features are supported. The GoPro is not capable of controlling fully automatic lenses.

The built in M12 socket of the Ribcage will support M12 lenses with a maximum of 4.65mm back focus distance. At maximum distance the set screw may not engage. For M12 lenses requiring a longer back focal distance we offer an optional M12 to CS-Mount adapter which provides all the necessary distance required.

Brands we have tested and find to be generally quite good are Computar, Kowa, Tokina, Fujinon, and Tamron. A selection of recommended lenses can be found in our shop.

Visit http://www.digified.net/focallength/ for a magnification calculator. Choose the “Digital Compact with 1/2.3” Sensor” option. You can then punch in different focal lengths to see their 35mm equivalent. This is a great tool for deciding what focal length will best suit your needs.

Below is a crop factor diagram showing the image circles projected by the most common lens types in relation to the GoPro image sensor. You may find it helpful to visualize the crop factor. Click to enlarge.

Crop Factor Chart

GoPro Shooting Modes

This image shows the sensor area used by GoPro’s different shooting modes. Medium mode gives you 75% field of view and Narrow mode will give you 50% field of view relative to the full sensor. These modes can be quite handy if you are using a lens smaller than the recommended 1/2.3″. You can also get more magnification from a wide angle lens if you need to.

[PannySVHS]

On 9/29/2024 at 8:29 AM, Cosimo said:

Hey, yes, the guy will post a tutorial video on how to mod the phone to place c mount lens, thanks for asking. I am also trying it, waiting for some parts to arrive.

Cannot wait to read about your findings. If the Aquos sports the 20 MPix sensor from the RX, FZ and LX cameras, we should be in for a treat. Would love to see it running 10bit HLG on Mcpro24fps. What a bad name for a cool app btw.:)

[Cosimo]

First test on the fly. Oneplus 8 pro with c mount Vega 20mm @ f2. 

[Cosimo]

First test on the fly. Oneplus 8 pro with c mount Vega 20mm @ f2. 

 

[Cosimo]

some outdoor test

 

[PannySVHS]

Looking great. Now some pictures in motion, please:) And a tutorial:) @Cosimo

[Cosimo]

7 hours ago, PannySVHS said:

Looking great. Now some pictures in motion, please:) And a tutorial:) @Cosimo

I will to some video test soon whenever I get some time off. Meanwhile you can have look at the tutorial. Having the the control of the  lens in your hand and the character of a real lens is another game. I wish anyone would try the feeling. It's amazing, I am waiting for some more lenses with different focal length to arrive. I will also test what it's like with an anamorphic in the front. Motioncam pro with its raw video  it's fantastic!