![]() For example, one may have a 45 MP FF camera sensor, however switch it to crop mode. All else being equal, a FF sensor is going to be cropped, so your throwing away millions of pixels. ![]() As you can see, DOF is really a terrestrial issue. However, with Mirrorless cameras and the amount of AF points they have, it covers the whole sensor so keeping an AF point on a target is not as critical. Many wildlife photographers prefer a crop sensor over FF because the Auto Focus points usually go edge to edge on a crop sensor so their target is always in the AF zone. Instead of changing lenses, I could increase my distance to subject by 1.5x, but again, the look of the DOF will change. This would give me the exact composition, however, the DOF has changed and would not look the same(DOF) because I changed the focal length. For example, if I used a 120mm lens to take a photo on FF, I would need a 80mm lens (120/1.5) on a crop sensor. To match the same composition of a full frame, on a crop sensor we need to change the focal length or distance to subject. However, the picture's angle of view will not be the same because of the affect of the crop sensor. When it comes to DOF(Depth of Field), if aperture, distance to subject and focal length are the same, the DOF will be the same whether on a FF or Crop sensor. Personally, I think the affects of Crop and Full Frame sensors are more of an issue for terrestrial photographers. This pixels on a crop sensor are smaller which can yield more noise, however the noise will have finer detail than Full Frame. ![]() In a nutshell, the Crop sensor has more of a concentration of pixels in a smaller area. There are differences between FF and Crop sensors when it comes to astrophotography and terrestrial photography. They can just be perks associated with buying a more appropriately sized sensor. But none of these things changes the facts above. And the additional file size, transfer, and processing overhead also adds up. And there’s something to be said for the drawbacks of interfaces designed around working with a full field of view when the intention is to crop significantly. It may be worth noting that larger sensors (especially full frame and up) become very demanding of many optics in the hobby and like to show off warts and backfocus or tilt issues on telescopes said to correct up to full frame, and may fall into weeds with a reducer. For example, the most popular Sony sensor used in APS-C and full frame sensors has a pixel pitch of 3.76μm. When comparing different lines of sensors (as opposed to the same sensor technology) it may be noted that smaller sensors may offer smaller pixel sizes. And that includes to depth of field, which isn’t as pertinent to astrophotography. Assuming the sensor generation is the same, and the pixel pitch is the same, a crop from the larger sensor, equal to the area of the crop sensor, will produce the same result.
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