How can I repair Err 01 with a Sigma lens from the movie era on a Canon digital SLR camera?

This is an old question, but the problem is still real in old lenses. What you need is a protocol interface that converts the camera's aperture change command to the lens. See my article in this link where the cause of the problem is found and its solution is described in detail old-sigma lens

For those who do not want to read the full article, I will try to describe the problem shortly. The old EOS cameras (at this time we can say that very old) used different digital commands on the SPI bus that tell the lens to adjust the aperture to some value. For some reason, Canon changed that command (old was 0x12 new is 0x13). The result is that your previous third-party lens cannot set the aperture, so you get ERROR 01 because the camera cannot set the aperture on the lens. The solution is easy, add a processor to the signal path that will convert the new command to the previous one so that the lens understands it. See the link above for more technical details, HW and SW sources.

Canon: is there a camera that can automatically upload photos to an Android device?

We are trying to build multiple Photobooths next to each other, which are equipped with a tablet that has a user interface to select and upload certain photos in a folder. At this time, we use the 700d / 750d canon (which is currently approximately 7-10 years old) with flash cards to take the photos and transfer them to the tablet where they can be selected and loaded. The problem is: the delay and the delay. Most of the time the images are almost as fast on the tablet as you can shoot (we don't shoot RAW for some reason) but occasionally it starts to get delayed and connection is missing … like 20-30 min. or more…

That is the reason why I asked my question here.
Most modern cameras can send selected photos to a nearby Android device, but I couldn't find any that can do it automatically. At least not the low or medium range cameras we have. I have seen that Canon 5DMKIV seems to be able to automatically upload images to an FTP server or a specific device on the network.

How to charge Canon EOS 7D Mkii using a laptop and a USB cable, charging the camera?

How to charge Canon EOS 7D Mkii using a laptop and a USB cable port … how will I know if you are charging the camera?

Canon: why can't I shoot tied with my camera while I'm connected to the computer?

You need to use some kind of software that can make attached shots. Simply by connecting a camera to the USB port of the computer, as you discovered, the camera / card will be treated as an external drive. You must have and run an application that can recognize a Canon dSLR and communicate with it to transfer / display files to shoot.

Something like Adobe Lightroom, or Canon in the free EOS Utility will work for this, for the camera models they support (there may be some that do not support, so the camera model you are using is necessary to determine if you can do it.

Magic Lantern does not add anchoring capabilities to any camera or software application that cannot.

Alternatively, some Wi-Fi enabled cameras that cannot connect to a computer (for example, the M2), can communicate with the Canon Connect application for smartphones / tablets.

Canon: the photo session does not work with the camera connected to the computer

I am trying to take pictures while the camera is connected to the computer. As soon as the camera is connected to the PC, the camera changes its mode to busy. Actually, the camera is treated like a USB key. We have Magic Lantern installed in the camera. I would like to activate the camera to take a photo while it is connected to the computer.

Can I use an SDXC card in a Canon Eos 500D?

I am new here. I bought this: SanDisk SDSDXN-128G-G46 Extreme (SDXC), but when I put the camera in and try to format it, the camera system alerts me that it can't and change the card.

Is there a compatibility issue between the 500D and SDXC card models? If so, can anyone suggest an optimal SD for the plain photo of the same memory space (128 g)?

Thanks in advance.

How to transfer all my photos from my Canon camera to my iPad mini in Wi-Fi?

Both answers to your questions. They are outlined in the manual as noted by Andy Blankertz. Manuals are generally not very good at telling you what you cannot do, but they are generally good at telling you what functionality was created. In this case, you must deduce the fact that you cannot do exactly what you want with an all-in-one button, but you must repeat a few steps.

The only option to download "all images" would be to select each image individually using the instructions on page 142, and repeat as necessary for each batch of 50 images as indicated on page 141.

This may sound tedious, but just to give you an idea of ​​how the Canon software is evolving, the EOS Remote application with which I have to work on my DSLR only allows you to download a single image at a time and does not even allow you to select several images (even less 50).

Page 142 of the SX280 manual:

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Page 141 of the SX280 manual:

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Canon: what camera should I buy?

I am willing to record several videos for YouTube and I need help choosing the camera.

considering that one of them could be a point of light focused on a dark room that could be assisted by a black background to ensure the appearance …

However, I have little budget to start, so I thought of digital SLR cameras like Canon 4000D and 2000D, which are the cheapest for me equipped with a stabilizer, since the camera will be free.

Would you recommend these cameras? Or else will my needs serve? If so, what kind of lenses would help?

Note that I am not looking for excellent videos like 4k, etc … just a pretty good 1080 quality without pixels or noise

Canon: Is it possible to use the bulb mode with the EOS Remote application without having to press and hold the shutter button?

No, the EOS Remote application does not have a press and lock function to shoot in bulb mode, such as the Triggertrap application. However, the Triggertrap application is unlikely to work for you, since you need two smartphones to use the Wi-Fi function to shoot, as well as a camera shutter cable and a dongle.

Your best option is, as mentioned, to try a different way to open the shutter, either remote controls or a cable that has a lock. The Magic Lantern bulb timer function or a CHDK script can work to do so without additional hardware, but this depends on whether there is a suitable construction for your specific camera.

Canon: Should I buy a speed amplifier to widen the field of view of my kit lens or buy a 35mm primer?

Michael C gave you a very good answer about the speed accelerator. But I want to address the other question.

Can anyone give any advice?

Well, stop reading things about the "disadvantages" of a clipped sensor because they are bothering you for "some reason", but don't look for any particular reason.

Take your camera and shoot. Enjoy taking photos, enjoy experimenting with the light from a window, from the opposite window, lie on the floor, climb a ladder.

KNOW your existing lens, this is the most important.

I worry that the field of vision is too "enlarged" or "cropped."

You already have a 50 mm lens. Is it too enlarged or trimmed for its intended use? Not only should you "worry", you should try it.

If you need a lens for any particular reason, which I think is for indoor photography for group shots in low light, you could get a 35mm 1.8 lens or use a flash.

Is it a 35mm lens for you? You can also find out with your current lens.

I doubt it is the size of the sensor.