Textbook solution for Principles of Physics: A Calculus-Based Text 5th Edition Raymond A. Serway Chapter 27 Problem 13OQ. We have step-by-step solutions for your textbooks written by Bartleby experts! 5 diopter = 2.25x magnification at 8” focal length 7 diopter = 2.75x magnification at 5.5” focal length. As a general rule of thumb, when your magnification gets larger, your lens and focal length get smaller. What is meant by ‘Field-Of-View’ (FOV)? The field of view is the size of the magnified area that is in focus under the lens. Apr 19, 2020 · While the overall magnification will increase, as the image of the target in your vision is getting bigger, so does the image of the reticle. However, just speculating logically, if the parallax is not set for the target range when adjusting the ocular, the reticle will be at a different focal distance, so may not increase in size at the same rate. A wide field eyepiece will also widen your field of view, that is, the width of what you see. As a result, you will not have to move the slide as much while you are viewing. Let's discuss the topic of changeable eyepieces. Field of View. Field of view, or FOA, is the distance you can see, through your scope, left to right. For example, if you have a 100 meter field of view, you will be able to see 100 meters, left to right, while looking through your scope. You may need a better field of view for different situations. As the magnification power gets higher, your ...