query: 30x Optical Zoom vs. 30x Magnification on Binoculars?
positive_passages.docid: 152115
positive_passages.text: Can I convert binocular zoom to equivalent lens focal length?
negative_passages.docid: 11096
negative_passages.text: Why does my aperture setting change as I zoom on my DSLR kit lens?
negative_passages.docid: 110812
negative_passages.text: Magnifying power of concave mirrors
negative_passages.docid: 153578
negative_passages.text: Variable focal length for macro lenses?
negative_passages.docid: 4403
negative_passages.text: Nikkor f/1.8G 35mm or 50mm?
negative_passages.docid: 37632
negative_passages.text: How to compare the focal length of a 50mm prime lens with the default lens of a point and shoot camera?
negative_passages.docid: 35186
negative_passages.text: Would a prime be redundant with a fast zoom?
negative_passages.docid: 131461
negative_passages.text: Circular polarizing filter - slim or regular?
negative_passages.docid: 145622
negative_passages.text: How do constant aperture zoom lenses work?
negative_passages.docid: 6598
negative_passages.text: How to calculate the correct focal length needed for a subject of a given size and distance?
negative_passages.docid: 94271
negative_passages.text: What is the reference plane used when the minimum focus distance is measured?
negative_passages.docid: 111197
negative_passages.text: Do the Lightroom lens correction tools make good lenses less important?
negative_passages.docid: 60690
negative_passages.text: Optical microscope magnification limits?
negative_passages.docid: 6544
negative_passages.text: How do zoom lenses restrict their widest aperture at the telephoto end?
negative_passages.docid: 105343
negative_passages.text: Interference at the focus of a convex lens or a concave mirror
negative_passages.docid: 53920
negative_passages.text: What are the advantages of using the optical viewfinder over live preview to take photos on a DSLR?
negative_passages.docid: 84864
negative_passages.text: What is the difference between using an ND filter versus 2 polarizers?