Prime Focus DSLR or Micro 4/3 thru ED Refractor Assy. Circular Polarizer Options ???

Discussion in 'Digital Discussion & Q&A' started by SeattleDan, Feb 16, 2012.

  1. SeattleDan

    SeattleDan TPF Noob!

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    I have a deck facing East and slightly North, overlooking a river, where I watch birds. I live near Seattle, so we have various light challenges... overcast or clouded skies with deep green landscapes, and water. I'm not even up to the "novice" level of photography. I'm just going to take pictures of ducks from my deck.

    Sun comes up and fills my living room and deck with direct light, from South, and East until about Eleven AM. Then it goes to my right rear, as I face the targets, South and West, behind the building. But, even in the afternoon, with the clouds, river, buildings etc, reflecting light... I still need a filter.

    1. Will a more or less permanent, Circular Polarizer, be effective, or even possible, as a part of the adapter, filter, assembly between the Scope and Camera? It would be more convenient there.

    2. Would it be better to have a full objective sized Polarizer over the end? If so, could this effect the ED or HD qualities that I'm wanting from the Coatings on my Objective Lens, for wildlife photography?

    3. While I'm at it (although I have a million questions, I'll stop here)... The DSLR or Micro 4/3 have large sensors. But with optical aberration from the scope/lens, I think I read that a "Flattener" would help utilize the full size of the sensor, bringing the outer areas into crisp focus as well. (They use this in Astrophotography). I will usually not want a "doubler;" but more likely will want, a "reducer," for closer focus in terrestrial photography. Will the Circular Polarizer, Flattener, and either Reducer, or Doubler, combined, be just one thing too many?

    Can it work?

    OK, don't shoot. I was here before with some even more crazy questions and this is what I noticed. Bird Photo guys (not all but some), understand the Physics of photography less than straight up photographers. They depend on fancy schmancy equipment, and while they don't say it outright, what they mean by what they say is "Spend more money." Money's nice, when you can get it, eh?

    OK, thanks ya'all.

    Dan


    edited to add: The Micro 4/3 gizmos, for the time being, with an aftermarket adapter, have the ability to use VERY old school, lenses. While they must be focussed manually, this is an affordable learning opportunity for me, since so many older lenses, of high quality, are available. I'm recently retired/disabled and looking forward to learning more with the free time.

    What I'm saying, is, if anyone wants to tell me to throw the telescope away and get conventional lenses, or any other suggestions... that's FINE by me. We can do it all.

    thanx


     
    Last edited: Feb 16, 2012
  2. KmH

    KmH In memoriam Supporting Member

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    What is the aperture, speed of the refracting telescope? Is it an apochromatic refractor?

    A CPL loses effectiveness and delivers an uneven effect when the Sun is more than 30° above the horizon, or at a side angle of more or less than 90° to the lens focal length axis.
    There are 3 - 35 mm format image sensor sizes: full frame - 36x24 mm, and the smaller 2 APS-C sizes - Nikon's 24x15.5 mm (1.5x crop factor) and Canon's 22x15 mm (1.6x crop factor).

    The 4/3 image sensors are 40% smaller (2.0x crop factor) than the APS-C sizes and 75% smaller than full frame.

    Each piece of glass you add to your system will eat some light. A doubler will also affect your apparent aperture (2 stops). If your set up is f/5.6, a doubler will make it f/11. To get enough light will then require a longer exposure. A longer exposure means more motion blur.

    Serious birders know there is no substitutre for reach. Reach coupled with a fast lens aperture = $$$$$'s. A fast aperture is needed to keep the shutter speed short so motion blur is stopped.
     
  3. SeattleDan

    SeattleDan TPF Noob!

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    thank you very much

    I'm still shopping, scope wise, saving money, while I play with the cheaper one

    sincerly, thank you
     

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