Jump to content

Forums

  1. News and General Discussions

    1. Sony Alpha News & Rumors

      News, rumors and reviews about Sony Alpha gear and related stuff

      1,801
      posts

    2. General Discussions about Sony Alpha

      Questions and discussions about Sony Alpha and Sony NEX

      3,222
      posts

  2. Sony Alpha Full Frame

    1. Sony Alpha Full Frame Cameras

      Sony A9 / Sony A7 / Sony A7II / Sony A7R / Sony A7RII / Sony A7S / Sony A7SII

      11,848
      posts

    2. Sony Alpha Full Frame Lenses

      Lenses for Sony A7 / Sony A7R / Sony A7S by Sony and other manufacturers like Zeiss Loxia

      6,240
      posts

  3. Sony Alpha APS-C / Sony NEX

    1. Sony Alpha APS-C and NEX Cameras

      Sony A6000 / A6300 / A6500 / A5000 etc. and Sony NEX

      3,394
      posts

    2. Sony Alpha APS-C Lenses

      E-Mount Lenses for Sony NEX and Sony Alpha APS-C Cameras

      1,634
      posts

  4. Adapting Lenses

    1. Legacy Lenses

      Discussion about legacy lenses and how to adapt them to Sony Alpha cameras

      1,939
      posts

    2. Adapters & Speedboosters

      Adapters and speedboosters (Metabones etc.) to adapt lenses to Sony Alpha cameras

      768
      posts

    3. Showcase Adapted Lenses

      Show here your sample images of adapted lenses.

      741
      posts

  5. Showcase Sony Alpha Photos

    1. People

      Portrait photos made with Sony Alpha / Sony NEX cameras

      1,983
      posts

    2. Nature & Wildlife

      Nature & Wildlife photos made with Sony Alpha / Sony NEX cameras

      1,190
      posts

    3. Landscape & Travel

      Landscape & Travel photos made with Sony Alpha / Sony NEX cameras

      2,398
      posts

    4. Architecture

      Architecture photos made with Sony Alpha / Sony NEX cameras

      335
      posts

    5. Misc

      Other photos made with Sony Alpha / Sony NEX cameras

      722
      posts

  6. Sony Alpha Video

    1. Sony Alpha Video Discussion

      Technical discussions about videos made with Sony Alpha / Sony NEX cameras

      586
      posts

    2. Video Showcase

      Show us your videos made with Sony Alpha / Sony NEX cameras

      367
      posts

  7. About the Sony Alpha Forum

    1. About the Sony Alpha Forum

      Questions about the Sony Alpha Forum? Ask here!

      170
      posts

    2. Newbie / Self Introduction

      New to the Sony Alpha Forum? Introduce yourself here!

      599
      posts

  • Topics

  • Posts

    • Pieter
      long exposure question

      By Pieter · Posted

      I think I've found your solution: your ND filters are not 8 and 4 stops, but 3 and 2 stops respectively: to get the stop number, take the Nth root of the ND number, where the answer should be 2. So 8^(1/3) = 2 and 4^(1/2) = 2. Combined you only have 5 stops of ND, not 12. A correct exposure should then be 1/25 sec × 2^5 = 1.28 sec instead of 164 sec! The numbers on ND filters are designed such that you can easily calculate the correct exposure time. Don't think of a number of stops, just multiply everything: 1/25 sec × 8 × 4 = 1.28 sec. The MM+/- number is just a realtime exposure meter compared to a 'desired' value of 0. Point your camera somewhere dark or bright and you'll see this number go down and up. Nothing is compensated for, it's just a reading.
    • SnappyMilt
      Apps for A7iii

      By SnappyMilt · Posted

      The Sony Apps work on the original a7 line and the a7ii line, but not on the a7iii line.
    • Thebeard614
      Samyang 24mm 2.8 for Landscapes

      By Thebeard614 · Posted

      I’ve just gotten my first Sony body coming over from Nikon. I purchased the 50mm 1.8 as first general purpose lens and to test the camera. I’m now looking to get a wider angle but keeping budget lower currently. I shoot mostly landscapes and nature while hiking and throw in some travel images.  Has anyone used the newish Samyang 24mm 2.8 lens for landscapes? I am looking at purchasing that or the Zeiss 24-70 f4. Coming from zooms on Nikon I found I mostly just shoot towards the wide end of a 28-75 and compose my images based on that. I will likely add the 70-200 f4 later on for landscapes as well. Thoughts on Samyang 24mm 2.8 new vs Sony 24-70 f4 used? Any votes for the Sony 28mm f2 and add the wide angle converter to 21mm?  Thanks 
    • Sebast
      long exposure question

      By Sebast · Posted

      thanks for your reply.  yes ISO was fixed.  it seems when I switch from A to M modes the only thing that changes on the back display is the Exp.Comp changes from just a +/- number to "MM+/- number.  then in M mode if I change the shutter speed, the MM+/- compensates for it.  very frustrating.  I just can't find a way to shut this off.  Maybe this is just a flaw in the a5100??
    • Pieter
      long exposure question

      By Pieter · Posted

      If you are in manual mode and have ISO set on 100, by definition can there be no auto exposure compensation by your camera: all three exposure variables are fixed by your manual settings. Your math is correct: if you meter 1/25sec at f/11 ISO 100, if you add 12 stops of ND the same exposure requires 164 seconds (or 2 mins 44 sec). Are you sure you stacked the two ND filters properly? Was your ISO fixed at 100 when you did the metering in A mode? Unlikely to be your problem as this would have caused under- instead of overexposure. Just trying to isolate your problem.

  • Forum Statistics

    • Total Topics
      8,035
    • Total Posts
      39,946
×