Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    Name or NavList Code:
    Email:
       
    Reply
    Re: DSLR Camera Star Lunar
    From: Greg Rudzinski
    Date: 2013 May 22, 15:04 -0700

    When imaging by digital camera for the purposes of clearing a lunar it is important to have enough pixel capability in combination with a fixed focal length telephoto lens (zoom lenses are no good). For this star lunar a 200 mm fixed prime lens was used with a 10 mega pixel camera body which gives about 0.1' of arc per pixel. This is roughly equivalent to a scoped metal sextant in capability. The limiting factor when using a telephoto lens is the field of view. A 6° usable field is all that I'm getting. An interesting benefit when doing the digital camera lunar is that imaging can be performed from a boat or aircraft if a high shutter speed is used in manual mode. Real time lunar clearing requires Frank's lunar calculator so an internet connection is needed. Most commercial airlines have internet onboard which means a lunar can be captured from a window seat, cleared, then immediately compared to a GPS hand held reading during a night flight.

    Greg Rudzinski

    P.S. Capturing a lunar while aboard a commercial jet liner in flight is high on my bucket list ;-)

    Camera Star Lunar
    From: Greg Rudzinski
    Date: 2013 May 21, 21:28 -0700
    The attached image of the Moon and Spica was taken UT 3:47:25 5/22/2013
    from 34° 10.4' N 119° 13.8' W using a 200mm fixed prime lens on a Canon Rebel 10 MP body.
    Settings: ISO 800, 1/500 sec., F 8, infinite focus.
    Measured pixels 2476 at .0975 minutes of arc per pixel for 4° 1.4' Hs
    Lunar error -0.4'

    This is my first camera star lunar. The Moon is filtered using a pair of linear polarizers held out in front of the camera lens. The star is unfiltered. iPhoto electronic dark room adjustments were necessary to enhance and draw out the star and sharpen the Moon's limb.

    Greg Rudzinski
    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

    Attached File:


    Attached File:


    Attached File:

    www.fer3.com/arc
    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site