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Having Shutter Speed a Multiple of Frame Rate is Now Old Hat!

MikeOfBonsall

By MikeOfBonsall,
in Sony Alpha Video Discussion

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MikeOfBonsall Enthusiast

MikeOfBonsall

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Shooting S-Log outside in bright conditions. Needing always too have small aperture that is not sharpest I bough a bunch on ND filters. Results seemed like they should be better so I shot some footage with no filters and the camera on full auto to see what the camera does. The results were very good and I noticed the camera (when making its own decisions) does not restrict shutter speed to a multiple of the frame rate. It was shooting 30p at 1/1250 at f4!

 

So now I set my camera to the f-stop I want, leave iso on lowest and control exposure with the shutter, and that gives the best results I have got so far.

 

I'm anticipating some great comments.

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cws Enthusiast

cws

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Posted

Again comes back to specifics of what your subject is....

- if you want shallow depth of field you need a wide f-stop like f4,

- if you have a subject that is moving through frame and you want a "normal" motion blur that helps smooth out the motion then you wouldn't want such a high shutter speed as 1/1250th, so you'd have to ND down to a "standard" shutter speed (eg 1/60th = 180deg shutter at 30fps)

- however if you essentially have little or no movement in frame, or you want/like that "frozen movement" look on anything moving through frame, then you can have whatever shutter speed you like to give best exposure with no (or limited) ND's... removing another layer or more of glass that will otherwise reduce overall sharpness, and potentially introduce flare etc to the image.

Rules are there to be broken, if it works for you.... but it's good to know the rules.  :D

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    • Pieter
      Blurry images on Sony 70-350

      By Pieter · Posted

      I've been using this lens extensively without any sharpness issues. At long focal lengths, you'll have to factor in the need for a faster shutter speed (< 1/500-ish at 350mm) and other factors like atmospheric distortion, fog/dust haze, etc. All these factors contribute to a deterioration of image quality at longer focal lengths.
    • Cameratose
      Blurry images on Sony 70-350

      By Cameratose · Posted

      That's supposed to be a pretty good APS-C lens. Can you try it on a different camera just for the heck of it? Friend? Camera shop? The lens is noted for sharpness, so if you're having as much trouble as you say, you may want to look into a replacement or repair. 
    • broz_tito
      Blurry images on Sony 70-350

      By broz_tito · Posted

      Hi everyone, I’m reaching out to the community because I’m facing a persistent image quality issue with my Sony 70–350mm f/4.5–6.3 G OSS lens, and I’d like to know if this is normal behavior or if my copy is defective. Problem description: I’ve extensively compared the 70–350mm G OSS with my Sony 18–135mm f/3.5–5.6 OSS, using a Sony A6700, under controlled conditions: • Identical lighting and background • Same subject and position (LEGO figure, consistent framing) • Tripod or steady support • Manual focus or AF with center point • Same shutter speed (e.g., 1/200s), similar ISO (ISO 4000–6400), RAW + JPEG • OIS turned on (and also tested with OIS off) My observations: • At 135mm, the 70–350mm G OSS delivers softer, flatter images than the 18–135mm, even when stopped down. • At 350mm, the sharpness drops significantly – the center is soft, and textures (like LEGO tiles or fabric) appear blurred or smudged. • Contrast and micro-detail are noticeably inferior across all focal lengths. • The 18–135mm at 135mm (even cropped) retains better edge sharpness and detail definition. • Both JPEG and RAW files confirm the issue – this is not just JPEG processing or noise reduction. Question to the community: • Have others experienced similar softness with the 70–350mm? • Is it possible I have a decentered or optically misaligned copy? • Is there a known issue with OSS introducing softness at long focal lengths? I wanted to love this lens due to the range and portability, but currently it’s unusable for anything where image quality matters. I’m considering returning or sending it for service. Thanks in advance for any feedback or comparison results you can share.  

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