Having had the most experience shooting architectural interiors, I have developed some very simple essential tools and techniques that work almost every single time I’m shooting interiors and exteriors. One of the most important tools in my camera bag is my hot shoe bubble level. This very compact piece of equipment (for only around $25 I might add) allows me to very quickly level my camera on two axis’ (pitch and roll) so as not to get annoying perspective distortion. Having straight vertical and horizontal lines in architecture photography is aesthetically pleasing and doesn’t distract from the natural beauty of the architecture and/or design.