Re: [APML] Mercury, Venus,Mars and Saturn wide-field (medium format 40mm)

["Taras R.Hnatyshyn" <tarashnat@earthlink.net>]

Stuart,

Fifteen seconds is the limit at f/4 on the sky AFTER twilight in
New York City. Wait too long and Mercury is lost in the horizon muck.
To the south west from my location is Newark airport. And planes from
LaGuardia Airport flying south pass to the west of me. Any exposure over
five seconds WILL have aircraft in it, usually more than one.

Taras


On Apr 1, 2004, at 6:11 AM, Stuart Heggie wrote:

> Taras - I suspected it was pretty short. You might want to consider
> going 10 and 20 seconds. With that wide a fov, you can run longer
> exposures for sure. Four seconds is not enough. You might have needed 
> to
> wait a few minutes for the sky to darken though.
>
> Stuart
> http://www3.sympatico.ca/stuart.j.heggie/Stuart.J.Heggie/
> Flesherton, Ontario, Canada
>
> ----- Original Message -----
> From: "Taras R.Hnatyshyn" <tarashnat@earthlink.net>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Thursday, April 01, 2004 2:16 AM
> Subject: Re: [APML] Mercury, Venus,Mars and Saturn wide-field (medium
> format 40mm)
>
>
> Stuart,
>
> That was a 3 sec exposure at f/4. I had one exposure that had gone 4
> sec.
> I just scanned the transparency that looked the best to my eye to 
> remain
> current. I'll take a closer look at all 12 exposures I took that 
> evening
> eventually. I only acquired the 40mm Distagon this January, so I'm 
> still
> getting the hang of how it performs.
>
> Taras
>
> On Mar 31, 2004, at 8:30 PM, Stuart Heggie wrote:
>
>> Taras - looks good! I would think you could have gone with a longer
>> exposure. Did I miss the details - what film and actual exposure?
>>
>> Stuart
>> http://www3.sympatico.ca/stuart.j.heggie/Stuart.J.Heggie/
>> Flesherton, Ontario, Canada
>>
>>
>>> Fellow APMLers,
>>>
>>> I finally had clear skies for the planetary alignment on Monday,
>>> just in time for the greatest elongations of Venus and Mercury.
>>> The photo was taken with a Hasselblad 2000FCW with a shutter
>>> speed multiplier (gives electronicly timed shutter speeds from
>>> 1s to 60s) and my 40mm f/4 Distagon C T* lens. The lens gives
>>> a hor./vert. field of view of about 68 deg. Just enough to catch
>>> the four planets.
>>>
>>> I am debating whether to take the effort to process out the
>>> horizon glow/vignetting effects, or whether to leave the image
>>> as it is. Photo take at approx. 7:15 pm in NYC, at least a half an
>>> hour before the end of twilight.
>>>
>>> Monday's western sky...  (640x640 pixel)
>>>
>>>  http://homepage.mac.com/tarashnat/temp/MF-00163-07.jpg
>>>  http://homepage.mac.com/tarashnat/temp/MF-00163-07a.jpg (with
> legend)
>>>
>>> Taras
--
                         <end of message>
******************************************************************
* Taras R. Hnatyshyn                     tarashnat@earthlink.net *
*    http://homepage.mac.com/tarashnat/astrophoto/welcome.html   *
*  73°59'18.4"W 40°43'37.2"N    or    74°25'24.4"W 41°40'42.0"N  *
******************************************************************

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