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

[CartersXRd]

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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