Big sensor and landscape photography, DoF

I’ve been an owner of point & shot cameras for some years. Now, I’m considering to move to bigger sensor cameras (4/3, asp-c) because I really hate the noise that small sensors produce on low light conditions/high iso settings.

My fear with bigger sensors is a narrower depth of field. I know this is fine for portrait, but I was thinking about landscape photography.

How does those sensor sizes behave for landscape photography? Can usually the automatic of the camera keep in focus

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Does the Canon EOS Rebel T5/1200D have any dust related problems?

I’m planning on purchasing the Canon EOS Rebel T5/1200D very soon. It’s the only DSLR that fits my budget (other one is the Nikon D3100 which I don’t plan to get).

I like everything about the camera except that it does not have any Sensor Cleaning System. I’ve read that the cleaning system does effectively reduce the amount of dust on the sensor, but since the Rebel T5 does not have any cleaning mechanism, I guess there will be some issues related to dust gathering on the sensor.

Also

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Does the Canon EOS Rebel T5/1200D have any dust related problems?

I’m planning on purchasing the Canon EOS Rebel T5/1200D very soon. It’s the only DSLR that fits my budget (other one is the Nikon D3100 which I don’t plan to get).

I like everything about the camera except that it does not have any Sensor Cleaning System. I’ve read that the cleaning system does effectively reduce the amount of dust on the sensor, but since the Rebel T5 does not have any cleaning mechanism, I guess there will be some issues related to dust gathering on the sensor.

Also

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Converting cameras for infrared use: When does the filter have to be replaced, and when is simply removing it ok?

When converting a digital camera for infrared use, the general approach is to remove any filters that limit its sensitivity to the visible range of light wavelengths.

Some conversions replace the existing filter by clear glass, some by a dedicated infrared filter, and some seem to just leave the filter off entirely.

I wonder what difference leaving the filter off entirely and replacing it with clear glass of equivalent physical dimensions and refractive index makes. My current suspicion is that

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