Digital Camera Buyer's Guide: Real Cameras - Comments

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Discussion Overview

The discussion revolves around the concept of crop factor in digital cameras, particularly in relation to the 35mm format. Participants explore the implications of crop factor for beginners and the understanding of sensor sizes in photography.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • A participant requests clarification on crop factor and its significance, expressing confusion about the mathematical aspect.
  • Another participant provides a calculation of the diagonal size of a standard 35mm sensor and explains how to derive the sensor diagonal from the crop factor.
  • Some participants express concern that the assumption of understanding crop factor may be too high for beginners, questioning whether the dimensions of the 35mm format should be explicitly stated in beginner resources.
  • One participant suggests that while knowing the exact dimensions may not be crucial, understanding that they serve as a reference for equivalent zoom ranges is important.
  • A suggestion is made for a smartphone camera buyer's guide, referencing the recent release of an advanced smartphone camera model.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the necessity of explaining the dimensions of the 35mm format for beginners, indicating a divergence in views on the clarity of the original article.

Contextual Notes

There is an assumption that readers have a basic understanding of photography concepts, which may not hold true for all beginners. The discussion highlights varying levels of familiarity with technical terms and calculations.

Who May Find This Useful

Individuals interested in photography, particularly beginners seeking to understand camera specifications and terminology related to crop factors and sensor sizes.

Andy Resnick
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Andy Resnick submitted a new PF Insights post

Digital Camera Buyer's Guide: Real Cameras

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question:

Crop Factor: The crop factor is the size of the sensor relative to the 35mm format. For example, a crop factor of 1.6x means the camera sensor diagonal length is 26.8 mm.

Reference https://www.physicsforums.com/insights/digital-camera-buyers-guide-real-cameras/
I've never heard of crop factor before but I don't follow that math at all. Can you expand on what this means / how it works?

Thanks
 
Jonathan Scott said:
Diagonal of standard 35mm sensor (36mm x 24mm) is approx 43mm, so crop factor 1.6 means sensor diagonal about 43mm/1.6 which is about 27mm diagonal.
https://en.wikipedia.org/wiki/Crop_factor
Ah. Got it. Thank you. I do think that the assumption that this is immediately understandable is a bit of a stretch since the article (which is very good) is for beginners so @Andy Resnick, would a beginner be expected to know that 35mm => 35x24 ?
 
phinds said:
Ah. Got it. Thank you. I do think that the assumption that this is immediately understandable is a bit of a stretch since the article (which is very good) is for beginners so @Andy Resnick, would a beginner be expected to know that 35mm => 35x24 ?
36x24, and probably not, but it isn't so important to know these exact dimensions as long as you realize that's what people are using as the reference when they say a certain camera/lens has an equivalent zoom range of 28-200 mm or whatever. They mean the field of view covers the same range as a 28-200 mm lens would on a traditional 35 mm format camera.
 
Now we need a smartphone camera buy guide. Google just came out with the Pixel. Supposed to be most advanced smartphone camera.
 

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