24 mm - Good Wide Angle Coverage
Even though there are very good examples of landscapes photos taken with tele lenses, most of the landscape photos are taken with wide angle lenses. Very High Resolution Sensor: 20.0MP
Canon SX420 IS's 20.0MP sensor is perfect for landscape photography. It will capture a lot of fine details and let you print them larger.
No Manual Exposure Mode
A correct exposure of a landscape shot is very important. Even though modern digital cameras features advanced algorithms to calculate the right exposure, they still may fail some difficult conditions. Lack of manual exposure mode in these conditions means lot of shadow and highlight clipping. No Manual Focus Mode
Manual focus in landscape photography is very useful in order to have a sharp image and minimize the areas that are out of focus. Autofocus may not consistently give you the best results. No RAW shooting capability
RAW files contains much more color information compared to JPEGs, and gives you more room for post processing without significant quality loss. They provide wider dynamic range and option to recover shadow and highlight clipping to some degree. Small 1/2.3" (6.17 x 4.55 mm) sensor
Canon SX420 IS's small sensor struggles in low light situations compared to larger sensors. No Environmental Sealings
Landscape photographs are taken outdoors and you should be prepared for all kind of weather conditions.