Archived posting to the Leica Users Group, 2018/10/20

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Subject: [Leica] Tested long exposure on the night sky last night - Howard
From: cartersxrd at gmail.com (CartersXRd)
Date: Sat, 20 Oct 2018 13:42:05 -0400
References: <mailman.1891.1540016172.2555.lug@leica-users.org> <8D6C358D-62EA-4327-AC96-23DB85BACADC@gmail.com> <98DF99A1-E2FE-46D1-93B1-E016B61424AA@gmail.com> <EFFC3688-0980-44B5-A84B-4708DD2E4191@gmail.com>

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 ? 17:04, Howard Cummer via LUG <lug at leica-users.org> 
>>> a ?crit :
>>> 
>>> 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
>>> 
>>> _______________________________________________
>>> Leica Users Group.
>>> See http://leica-users.org/mailman/listinfo/lug for more information
>> 
>> 
>> _______________________________________________
>> Leica Users Group.
>> See http://leica-users.org/mailman/listinfo/lug for more information
> 
> 
> _______________________________________________
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Replies: Reply from photo.philippe.amard at gmail.com (Philippe) ([Leica] Tested long exposure on the night sky last night - Howard)
In reply to: Message from hcummer at gmail.com (Howard Cummer) ([Leica] Tested long exposure on the night sky last night)
Message from photo.philippe.amard at gmail.com (Philippe) ([Leica] Tested long exposure on the night sky last night - Howard)
Message from cartersxrd at gmail.com (CartersXRd) ([Leica] Tested long exposure on the night sky last night - Howard)