I've tried searching here for an answer to this question but to no avail. It's a newbie question, so please excuse me if it's stupid. What's the advantage of a petal style hood vs. a round hood? I have noticed that petal style hoods (4 blades) are positioned vertical and horizontal to the camera body. I assume this is so you can take a picture vertically or horizontally with one of the petals always being directly overhead so as to block out the light source from above (to prevent glare or CA?). But what if the light source is 45 degrees to the subject where the petal style hood is at its minimum protrusion. Wouldn't a round hood work better at all light source angles provided both style hoods have the same depth? I'll thank you in advance for your responses. I've posted other questions here before and you have all been very helpful. Thanks.