I don't understand the numbers in your table. I would have expected to
see a single pair of numbers for each zoom and power setting, eg:
35mm claimed GN actual GN
---- ---------- ---------
full GNc GNa
1/2 --- ---
1/4 --- ---
etc.
What did you give me? Does 0.1, 0.7, etc. mean deviation in stops from
the expected exposure? If so, all deviations are positive? Too much light?
Chuck Norcutt
C.H.Ling wrote:
> Just got the Sekonic 328F back from my friend, he borrowed it some months
> ago for playing with his new home studio.
>
> Here is the result I got, flash to meter distance 10 feet, ISO100, 1/125s:
>
> FL-50
>
> Zoom setting: 35mm
>
> GN30 - F2.8 0.1
> GN42 - F4
> GN59 - F5.6 0.1
> GN84 - F8 0.1
> GN118 - F8 0.7 (full power)
>
> Zoom setting: 85mm
>
> GN29 - F2 0.9
> GN41 - F2.8 0.8
> GN58 - F4 0.8
> GN82 - F5.6 0.8
> GN116 - F8 0.8
> GN164 - F11 0.5 (full power)
>
> T-32A
>
> GN52 - F4 0.6
> GN104 - F8 0.2
>
> T-32B
>
> GN52 - F4 0.2
> GN104 - F8 0.2
>
>
> C.H.Ling
>
>
>
> ----- Original Message -----
> From: "Chuck Norcutt"
>
>> Anybody with an FL-50 got a meter? How accurate are the guide numbers
>> at various power levels and zoom settings?
>>
>> Chuck Norcutt
>>
>>
>>
>> C.H.Ling wrote:
>>> Sorry for mis-read your point, the GNs on older flashes might be not
>>> accurate and mostly under powered but the FL50 seems much better. On the
>>> field it is not easy to reach a very accurate fill due to time limit,
>>> sometimes I just use TTL with -1 flash compensation. I'm also not good in
>>> estimate distance but anything in the 0.5 stop error range is ok with me.
>>>
>>> C.H.Ling
>>>
>>>
>>> ----- Original Message -----
>>> From: "Chuck Norcutt"
>>>
>>>> How does any of this relate to the subject of my comment which was that
>>>> flash units tend to be underpowered with respect to guide number? My
>>>> statement means if you use guide number in your calculation your shot
>>>> will be slightly underexposed. That's all. I meant nothing with
>>>> respect to various exposure situations.
>
--
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