Tips on using Tokina 500mm Mirror Lenses with Lumix gH4?

Discussion in 'Mirrorless Cameras' started by Katsi, Feb 10, 2015.

  1. Katsi

    Katsi TPF Noob!

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    I have recently bought a Tokina 500mm f8 mirror lens. I plan to take advantage of the gH4's x2 crop factor and give myself a decent equivalent 1000mm focal length in the hope that I might be able to get some decent shots of our moon and solar system.

    I have heard that focusing will be a problem. Does anyone have any tips to using this lens and camera combination? Does anyone have experience with this particular lens? Thank you.

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  2. tirediron

    tirediron Watch the Birdy! Staff Member Supporting Member

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    Since you're shooting astro, focusing shouldn't be an issue, just make sure you know where 'infinity' is on that lens, since it's not always exactly where it's marked on the lens. Be clear on how the crop factor applies. Your 500mm lens will have a field of view equivalent to a 1000mm lens on a full-frame camera, BUT... there's no increase in "magnification".
     
  3. Katsi

    Katsi TPF Noob!

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    Thanks Tirediron. Aha, so sorry, the field of view of the lens will be the same as it would be on full frame but it doesn't effect the focal length? Please forgive my ignorance. Trying to get my head around the concept. So what is the difference in what I will see between this lens on the gH4 and this lens on a full frame camera...?

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  4. Katsi

    Katsi TPF Noob!

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    Just so you know it all clicked into place after your comment yesterday. I now understand the restricted field of view due to the crop factor but that it doesn't change the magnification. Thanks for your help...!
     
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  5. astroNikon

    astroNikon 'ya all Bananas I tell 'ya Supporting Member

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    Watch the bright stars for focusing. They'll look like Donuts or slightly elongated/blurry if they are out of focus. I used to use a Nikon 500mm Reflex (mirror) lens, along with the telescopes which are essentially the same thing just a tad bigger. It was a great trainer for technique for the scopes.
    Have fun.
     
  6. Katsi

    Katsi TPF Noob!

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    Hey astroNikon, thanks for the tip! I have seen people making cardboard aperture rings and and strange things out of guitar tuning pegs to help focusing more accurately! I would love to get into using telescopes. I assume you capture images using your scopes too or do you just observe? I'll try and master the mirror lens before I have a bash at anything else I think...
     
  7. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Best attempted during night of good 'seeing', meaning as little turbulence as possible. A good sturdy tripod is mandated. Try bracketing your focus. Can you tether that camera to a computer and operate it remotely?
     
  8. Katsi

    Katsi TPF Noob!

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    Cool! Yeah thanks for the tip. Absolutely, I will try a nice still night. What do you mean by "bracketing"? The gH4 can be operated remotely by phone or iPad, something I intend to do....
     
  9. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Take a series of shots, changing the focus ever so slightly for each one. Maybe for astro stuff it isn't all that required as it is for terrestrial photography. But that's my method for using reflex lenses.
     
  10. astroNikon

    astroNikon 'ya all Bananas I tell 'ya Supporting Member

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  11. Katsi

    Katsi TPF Noob!

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    Thanks so much. AstroNikon that is a spectacular photograph. Its awesome, I love it. I hope to be able to achieve something like this. It blows my mind! Some great focusing tips in the link, can't thank you enough!
     

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