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  1. Re: Ektaskan br/a x-ray film reciprocity characteristics

    Days or weeks (Thanks for your chart for the shorter times)
  2. Ektaskan br/a x-ray film reciprocity characteristics

    Does ektaskan br/a x-ray film have the same reciprocity failure characteristics/formula as tmax 100 when used for very long exposure pictorial photography?
    Cheers Kanga
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    Re: Pinhole 8x10 using Xray film.

    Hi Randy,
    Single sided x-ray film. Total stand development - no mid development agitation (semi-stand).
    Cheers Kanga
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    Re: Pinhole 8x10 using Xray film.

    Thanks Jim,
    Do you know what caused the swirls in the upper right corner?
    Cheers Kanga
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    Pinhole 8x10 using Xray film.

    I made a cylindrical 8x10in pinhole camera for fun. I like this landscape image I took with this camera because of its flaws. I processed the orthochromatic xray film in 1:200 rodinal with stand...
  6. Re: Rear lens component used as long lens

    Hi Rudi,
    This explains why I needed 575mm of extension for the rear component of the RF3 (300mm lens) the nodal point is probably 25mm in from the surface of the rear element. That is 575+25mm...
  7. Re: Rear lens component used as long lens

    That was my thinking Mark- I am not an optical engineer but I thought stopping the lens right down might help. I am aware of diffraction issues but that is always a trade off for me as I generally do...
  8. Re: Rear lens component used as long lens

    Hi Dan,
    I tried the rear group of my RF3 300mm f/10 on my 4x5in and it required 575mm of extension. On the ground glass at least there appears to be no aberration at a marked aperture of f/32...
  9. Re: Rear lens component used as long lens

    Thankyou all for your comments. Has anybody tried colour with film or paper using the rear lens component?
    Cheers Kanga
  10. Rear lens component used as long lens

    I have an RF5 lomo process lens 450mm f10 that is a symmetrical double gauss design. I was wondering whether I could use the rear element as an ~800mm lens if I stop it all the way down to cover ...
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    Re: Wallaby Grass Seeds

    Hi dsphotog,
    Foxtails are found in Australia they are an introduced grass species here and are weeds they can out compete native grasses.
    Cheers Kanga
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    Re: Wallaby Grass Seeds

    Hi JMO,
    This is the wallaby grass seed with white as a background I have not finished working in photoshop and the texture of the backlit paper that I used is showing through - a white translucent...
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    Re: Wallaby Grass Seeds

    Hi Neal,
    I think technique is more important than lens choice. I regularly use apertures that go well into diffraction territory for photomacrography but for 3D subjects I would rather trade off...
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    Re: Wallaby Grass Seeds

    Hi Steve,
    Thanks I tried to give a Victorian era naturalist feel to the image.
    Cheers Kanga
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    Re: Wallaby Grass Seeds

    Hi JMO,
    Gayle has some nice images. I chose black as a background so the seed images with their fine hairs stood out. I did toss up whether to use a white background or not - I think I will try it...
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    Re: Wallaby Grass Seeds

    Hi Randy,
    Thanks. I use the small aperture to get maximum depth of field in photomacrography - I am willing to trade off diffraction for dof.
    Cheers Peter
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    Re: Wallaby Grass Seeds

    Hi Kumar,
    The lens is reversed however there is no need as the lens is symmetrical but I used a step up ring glued to the lens board to attach the lens.
    Cheers Peter
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    Wallaby Grass Seeds

    Whilst photographing indigenous wallaby grass seeds for the National Herbarium of Victoria using digital cameras and stacking technique I decided to take an image using my 4x5inch view camera.

    I...
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    Re: Process lens used for Landscape

    Hi hiend61,
    Thanks for your compliments. I was pleased with the results.
    Cheers Peter (Kanga)
  20. Re: Landscape images stand developed in Rodinal at 13 degrees celsius

    Thanks
  21. Re: Landscape images stand developed in Rodinal at 13 degrees celsius

    Hi Willie,
    Where do I find Patrick Gainer's Information?
    Thanks Peter
  22. Re: Landscape images stand developed in Rodinal at 13 degrees celsius

    Hi Randy,
    It is worth a try.
    Cheers Peter
  23. Landscape images stand developed in Rodinal at 13 degrees celsius

    Senescent River Red Gum

    178978

    Lilydale Lake

    178979

    I recently read that stand developed rodinal at low temperatures has smaller grain/less clumping. I found this to be true for Fomapan...
  24. Re: Can the lomo RF3 process lens be reversed?

    Photo of Treeferns in Mountain Ash Forest taken with reversed RF3. 15min@f/90 with fomapan 100.
    178037

    peterkinchington.com
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    Re: Process lens used for Landscape

    Thankyou everybody for your positive feedback. Dan in the 1850's there were some beautiful landscape paintings that were done of the Dandenong Ranges - Many of the Mountain Ash were huge then - much...
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    Process lens used for Landscape

    I used a 300mm f/10 process lens on my 4x5 for a Landscape photo of Treeferns and Mountain Ash (Eucalyptus regnans) near my home in Victoria, Australia. I took it whilst there was a light veil of...
  27. Re: BAUSCH & LOMB Aero Tessar 24" f/6-610mm

    Hi Dan,
    Thanks for the correction on tessars and the information on mounting very heavy lenses. I think that I will be happy enough with the RF3 300/10. I've got enough bits and pieces to carry into...
  28. Re: BAUSCH & LOMB Aero Tessar 24" f/6-610mm

    True Robert it is a Tessar design - so symmetrical and infinity focus would be around 24" of extension. I saw the lens today - you're right I am not going to attempt to hang it off my 5x4" camera....
  29. BAUSCH & LOMB Aero Tessar 24" f/6-610mm

    Does any one know how this lens performs as a telephoto lens for 4x5in (I know it is very heavy just concerned about image quality)? How much extension is required to focus on infinity?
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    Re: Dandelion Seeds 10:1

    Paul if you would like more details on how and why I took this photograph you can go to an article that I wrote here.
    Cheers Peter
  31. Re: Can the lomo RF3 process lens be reversed?

    Thanks Pere
  32. Re: Can the lomo RF3 process lens be reversed?

    Will do.
    Bye Peter
  33. Re: Can the lomo RF3 process lens be reversed?

    Dan does this mean the lens will perform the same mounted normally or reversed? I will give it a go if it is almost symmetrical.
    Thanks Peter
  34. Can the lomo RF3 process lens be reversed?

    Hi everyone, Arne and Dan,

    I read that the lomo RF3 300mm f/10 process lens is a 6/4 double gauss type - does anybody have a diagram of that construction? Is it completely symmetrical? If so I can...
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    Re: Dandelion Seeds 10:1

    Yes the ground glass is very dark - I initially focus at the widest aperture (still very dark).

    Cheers Peter
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    Re: Dandelion Seeds 10:1

    Hi Leigh, thanks for the praise -if you like macrophotography of nature. You might like some of my shots on my website.
    Bye for now,
    Peter (Kanga -as in Kangaroo)
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    Re: Dandelion Seeds 10:1

    Thanks Paul - I am happy to share my technique. I am glad you are inspired - using my newly acquired 4x5 gives me a much needed diversion from digital cameras. I am looking forward to doing some...
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    Re: Dandelion Seeds 10:1

    Hi Randy,
    Moved the tripod with the camera attached and bellows extended until the lens was about 3cm from the dandelion head then finished focus by moving the front standard. This is the approach I...
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    Dandelion Seeds 10:1

    I took these Dandelion Seeds with my 4x5inch view camera at 10x using a reversed 50mm f/1.4 minolta lens on about 500mm of bellows extension the marked aperture was f/16 giving an effective aperture...
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