[Leica] Tested long exposure on the night sky last night - Howard

[Philippe]

Thanks Ric,

I hadn’t hear of this rule. And the link is quite interesting.
the camera hit 30 secs on auto - which was the limit given in the chart, I’m must be just lucky :-)

Unfortunately, there’s too much haze tonight for me to take the 400mm Dicke Bertha out and try it on the skies at various speeds.
https://en.wikipedia.org/wiki/Big_Bertha_(howitzer) <https://en.wikipedia.org/wiki/Big_Bertha_(howitzer)>


I’ll try as soon as the weather and time allow.

Thanks again

Amities

Philippe




> Le 20 oct. 2018 à 19:42, CartersXRd via LUG <lug at leica-users.org> a écrit :
> 
> link with article for 500 rule
> 
> <https://petapixel.com/2015/01/06/avoid-star-trails-following-500-rule/>
> 
> ric
> 
> 
>> On Oct 20, 2018, at 1:35 PM, CartersXRd via LUG <lug at leica-users.org> wrote:
>> 
>> from the internet/petapixel
>> 
>> Here’s the 500 Rule:
>> 
>> 500 Divided By the Focal Length of Your Lens = The Longest Exposure (in Seconds) Before Stars Start to “Trail”
>> 
>> 
>> 
>> 
>>> On Oct 20, 2018, at 11:22 AM, Philippe via LUG <lug at leica-users.org> wrote:
>>> 
>>> Eppur si muove ;-)
>>> 
>>> https://en.wikipedia.org/wiki/And_yet_it_moves <https://en.wikipedia.org/wiki/And_yet_it_moves>
>>> 
>>> We may not perceive the tracks just because the FL is so short, and the sensor doesn’t record the jump from a pixel to the next one ???
>>> 
>>> Although I was using a tripod as you may imagine, I had left the IOS on, that could be another reason why. There was absolutely no wind and the foliage seems to prove it.
>>> 
>>> OTT 10mm means 15mm in Leica world, but it doesn’t modify the result ...
>>> 
>>> I’ll try a longer lens at the earliest opportunity, say the Novoflex 400 (600 eq.) for instance, and see what I get, and report.
>>> 
>>> Thanks Howard. 
>>> 
>>> Stay well, and vigilant :-)
>>> 
>>> Amities
>>> 
>>> Philippe
>>> 
>>> 
>>> 
>>>> Le 20 oct. 2018 à 17:04, Howard Cummer via LUG <lug at leica-users.org> a écrit :
>>>> 
>>>> Hi Philippe,
>>>> I am surprised that you can take a 30 second exposure with a 10mm lens
>>>> and have such small star tracks. When I shoot the skies with my 90mm
>>>> Elmarit on the M10 - above 8 seconds I get quite pronounced star tracks.
>>>> 
>>>> Just an observation. Lovely photo BTW.
>>>> Howard.
>>>> 
>>>> 
>>>>> On Thu, Oct 18, 2018 at 1:36 AM Philippe via LUG <lug at leica-users.org <mailto:lug at leica-users.org>>
>>>>> wrote:
>>>>> 
>>>>>> Tested long exposure on the sky last night.
>>>>>> 
>>>>>> http://gallery.leica-users.org/v/Phileica/Playground/Stars-1354-2.jpg.html <http://gallery.leica-users.org/v/Phileica/Playground/Stars-1354-2.jpg.html>
>>>>>> <
>>>>>> http://gallery.leica-users.org/v/Phileica/Playground/Stars-1354-2.jpg.html <http://gallery.leica-users.org/v/Phileica/Playground/Stars-1354-2.jpg.html>
>>>>>>> 
>>>>>> 
>>>>>> May be viewed larger.
>>>>>> 
>>>>>> Amities
>>>>>> 
>>>>>> Philippe
>>>> 
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>>> 
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>> 
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