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Should I return/replace my lens? EF-S 55-250mm sharpness/focus

Started Jun 7, 2018 | Questions thread
OP streetsnyc New Member • Posts: 11
Re: Should I return/replace my lens? EF-S 55-250mm sharpness/focus

plantdoc wrote:

This lens can take some very sharp images; however, there can always be a problem that can be tested for. In very bright light, find a target with plenty of sharp, contrasty detail. Some signs work well . With either a tripod or a shutter speed of 1/500+ and iso 100 take some pics with live view and the optical finder. Use a f stop wide open and 1 stop down. Examine the pics (highest quality jpegs are ok) and look for a difference between live view and optical finder. If they are equally sharp, focus is OK. If not, and live view is sharper, you have a front/back focus issue that you can only be corrected if your camera has micro focus adjust. Rebels lack this feature unfortunately. I find this lens works best with center point AF, shutter speed 1/250 minimum. Use servo focus for moving subjects but don't expect consistent results with fast, irregular action. Also, keep in mind, that telephoto has a shallow depth of field on closer subjects. Small sensor, wide angle cameras like most phones can keep almost everything in focus with little difficulty.

Greg

Wow, thanks for that amazing level of technical and troubleshooting information, much appreciated. I'll do that the soonest chance I get and see what the results are.

 streetsnyc's gear list:streetsnyc's gear list
Canon EOS Rebel T6i Canon EF 50mm F1.8 II Canon EF-S 55-250mm f/4-5.6 IS STM Canon EF-S 10-18mm F4.5–5.6 IS STM Canon EF-S 24mm F2.8 STM
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