Long flash-duration strobes [REVISED]: t=0.5 values

Discussion in 'Lighting Equipment' started by studio460, Jan 28, 2013.

  1. Longest duration t=0.5 value flash units [REVISED]:
    1. Metz Mecablitz series: Full-power = 1/250th*
    2. Quantum Qflash: Full-power = 1/300th
    3. Calumet Travelite 750R: Full-power = 1/650th††
    4. Dynalite Uni400JR: Full-power = 1/675th
    5. Speedotron Force 10: Full-power = 1/850th [constant at all power levels]
    6. Bowens Gemini Classic 500C: Full-power = 1/900th
    7. Elinchrom Quadra-S: Full-power = 1/1,200th ['A' outlet]
    *The t=0.5 specification for the Metz units is unconfirmed. While Metz' published t=0.1 specification is 1/125th at full power, Metz' does not publish a t=0.5 specification. See sources below for more information:

    http://pttl.mattdm.org/timing:flash-duration:metz
    http://speedlights.net/2010/11/10/metz-48-af-1-flash-review/
    ††The Calumet Travelite 750 t=0.5 specifications can be seen here on the Calumet site:
    http://www.calumetphoto.com/eng/product/calumet_travelite_750r_radio_enabled_monolight/ce1106
    Though both the Calumet Travelite 750 and Bowens 750 appear to be similar products, the Bowens 750 Pro has a published t=0.5 value of 1/2,300th:
    http://www.bowensdirect.com/index.php/compact-flash/geminipro/gemini-750pro.html
    However, the published Bowens figure raises another question. Even though the Bowens site states that the t=0.5 flash duration is 1/2,300th, based on this product description, "The Gemini 750Pro monolight feature all of the benefits of the Gemini r units, including Travelpak battery and Pulsar Trigger Card compatibility, but also offers more power and flash-durations as fast as 1/2300 sec. [emphasis added]," implying that a slower duration exists.
     
  2. [Note: this thread contains revised data, and supercedes the information in the list posted an older thread, posted here: http://www.photo.net/photography-lighting-equipment-techniques-forum/00b8JH]
     
  3. Correction--Metz Mecablitz:
    Since t=0.5 values are typically 1/3 the speed of t=0.1 values, we can estimate the Metz' flash duration at approximately 1/375th, given the manufacturer's stated t=0.1 value of 1/125th:
    Metz Mecablitz series: Full-power = 1/375th, estimate [t.1 = 1/125th]
     
  4. Longest duration t=0.5 value flash units v2.1 [CORRECTED]:
    1. Quantum Qflash: Full-power = 1/300th
    2. Metz Mecablitz series: Full-power = 1/375th†
    3. Lumedyne (various models): Full-power = 1/400th w/400Ws Signature-series power supply
    4. Calumet Travelite 750R: Full-power = 1/650th
    5. Dynalite Uni400JR: Full-power = 1/675th
    6. Lumedyne (various models): Full-power = 1/800th w/200Ws Signature-series power supply
    7. Speedotron Force 10: Full-power = 1/850th [constant at all power levels]
    8. Bowens Gemini 500C/500R/Calumet Travelite 375R: Full-power = 1/900th
    9. Elinchrom Quadra-S: Full-power = 1/1,200th ['A' outlet]**

    †This value is only an estimate, derived by multiplying the published t=0.1 value by three, and has not been confirmed by the manufacturer.

    **Note that there are other monolights with t=0.5 values lower than the Quadra-S head (e.g., 1/950th-1/1,100th), but this is the longest-duration strobe in a major-brand product in common professional use).
     
  5. Nikon Speedlights:
    Another site has published the specifications for all recent Nikon Speedlights in a conveninet table. To my surprise, Nikon Speedlights' durations are fairly long at full-power:
    Flash durations at full power ['t' value used is unspecified]:
    Nikon SB-400 = 1/300th
    Nikon SB-600 = 1/900th
    Nikon SB-700 = 1/1,042th
    Nikon SB-800 = 1/1,050th
    Nikon SB-900 = 1/880th
    Nikon SB-910 = 1/880th
    Source: http://photographylife.com/nikon-flash-comparison
    Listed in order of longest-to-shortest flash duration:
    1. Nikon SB-400 = 1/300th
    2. Nikon SB-900/910 = 1/880th
    3. Nikon SB-600 = 1/900th
    4. Nikon SB-700 = 1/1,042th
    5. Nikon SB-800 = 1/1,050th
     
  6. Combined list: Nikon Speedlights + monolights

    Listed in order of longest-to-shortest flash duration:

    1. Nikon SB-400 = 1/300th/Quantum Qflash: Full-power = 1/300th
    2. Metz Mecablitz series: Full-power = 1/375th [estimated]
    3. Lumedyne (various models): Full-power = 1/400th w/400Ws Signature-series power supply
    4. Calumet Travelite 750R: Full-power = 1/650th
    5. Dynalite Uni400JR: Full-power = 1/675th
    6. Lumedyne (various models): Full-power = 1/800th w/200Ws Signature-series power supply
    7. Speedotron Force 10: Full-power = 1/850th [constant at all power levels]
    8. Nikon SB-900/910 = 1/880th
    9. Nikon SB-600 = 1/900th/Bowens Gemini 500C/500R/Calumet Travelite 375R: Full-power = 1/900th
    10. Nikon SB-700 = 1/1,042th
    11. Nikon SB-800 = 1/1,050th
    12. Elinchrom Quadra-S: Full-power = 1/1,200th ['A' outlet]
     
  7. You must have taken the t=0.5 value of the Quantum T series at 1/300. The X series are 1/250. (or so I'm told).
     
  8. Ian said:
    You must have taken the t=0.5 value of the Quantum T series at 1/300. The X series are 1/250. (or so I'm told)​
    Yes, I did. That's the spec for the T-series, which you actually provided me in the old thread:
    http://www.photo.net/photography-lighting-equipment-techniques-forum/00YrJV?start=60
    Referring back to that Quantum table you posted, you're right! The 400Ws Qflash X/X2-series' t=0.5 value is 1/250th at full-power (the 200Ws Qflash X/X2-series is 1/400th). I'll have to amend the list. Thanks for catching that!
     
  9. Longest duration t=0.5 value flash units v2.2 [includes Nikon Speedlights]:
    Listed in order of longest-to-shortest flash duration:
    1. Quantum Qflash X/X2-series, 400Ws: Full-power = 1/250th
    2. Nikon SB-400 = 1/300th/Quantum Qflash T/T2-series, 150Ws: Full-power = 1/300th
    3. Metz Mecablitz series: Full-power = 1/375th [estimated]
    4. Quantum Qflash X/X2-series, 200Ws = 1/400th/Lumedyne (various models): Full-power = 1/400th w/400Ws Signature-series
    5. Calumet Travelite 750R: Full-power = 1/650th
    6. Dynalite Uni400JR: Full-power = 1/675th
    7. Lumedyne (various models): Full-power = 1/800th w/200Ws Signature-series power supply
    8. Speedotron Force 10: Full-power = 1/850th [constant at all power levels]
    9. Nikon SB-900/910 = 1/880th
    10. Nikon SB-600 = 1/900th/Bowens Gemini 500C/500R/Calumet Travelite 375R: Full-power = 1/900th
    11. Nikon SB-700 = 1/1,042th**
    12. Nikon SB-800 = 1/1,050th**
    13. Elinchrom Quadra-S: Full-power = 1/1,200th ['A' outlet]**
    **[Note: There are a handful of additional strobes with t=0.5 values lower than these two specific Nikon Speedlights, and Quadra-S head (e.g., Bowens, etc., from 1/950th-1/1,100th), but both the Nikon Speedlights and the Quadra head, have the largest t=0.5 values of strobes in such widespread use.]
     
  10. [revising]
     
  11. CORRECTION:
    Nikon SB-400 = 1/300th [INCORRECT]
    According to Nikon USA's current spec sheet for the product, its actual duration at full power is 1/1,300th. This must've been a typo from the orginal (non-Nikon) source.
     

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