Ken Strain

Lives in United Kingdom United Kingdom
Joined on Sep 22, 2012

Ken Strain's recent activity

  • The 12-40 is quite good too - though its coatings reflect quite a lot of IR, enough to reduce the transmission enough to notice (and give some flare, at some focal lengths).  I suspect that ...
  • I dug out a few EPM1 images to see if I could quickly find one with a red or orange filter on the 9-18mm, unfortunately it seems that all such images were taken with the 14-15mm (which is good at ...
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    _8052227 Panorama
  • Added 1 photo to their gallery
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  • The GMs are completely shock free - the shutter only has a rear mechanical curtain, the first curtain is always electronic. Ken
  • That is a very general question, so here is a general answer. Any camera with a mechanical shutter which shakes the camera just prior to or during the exposure can show blur due to the motion. The ...
  • That would do it! The sensor gets moved ~100 times as much as is needed to correct for shake with the 7.5mm, so even though IBIS is slow - mostly working around 1/4 to 1/10th second - it can cause ...
  • Yes, white balance, easy-to-use channel mixer and the range of options for highlight-recovery are all good reasons to use RT with IR images.  I find the last important to let me use as much ...
  • I saw the double images, but until reading your post it did not occur to me to ask kiri to check that the IS focal length is set to 8mm for the Samyang. If it happens to be set at a very different ...
  • Replied in IR focus
    That's the big advantage of mirrorless+ liveview - WYSIWYG, and the Samyang which is the main problem at the moment, is a manual focus lens.  I think the only pitfall with focusing with a wide ...
  • I sold my 9-18 long ago - my memory (and what I wrote here in 2013) is that it was reasonably OK and even quite good for IR around 9mm f/5.6, but got quite poor at some longer focal lengths.  I ...
  • Hi kiri, yes, that's my experience.  I think the options for false colour reduce rather rapidly as the cutoff wavelength moves into and through the red part of the spectrum.  By 730nm there is not ...
  • Yes, when the filter was clean I could get very good monochrome IR results (the sensor response falls off beyond 730nm, so the image mostly comes from a band between about 730nm and 780nm or so. Th ...
  • There should not be too much difference between 590nm and 610nm filters, so I think my gives an indication of the kind of results you should be aiming for.  I'm afraid you need to investigate and ...
  • Commented on a gallery photo

    Not meant to have artisitic merit - test shot to show that the Samyang 7.5mm can produce reasonably sharp IR (610nm longpass) images. The aperture was f/5.6. Note that the shadows are...

  • As you say, this looks blurry yet your 20mm shot looks fine. I think that rules out a problem with the conversion (probably). The blur does not look like shutter-shock to me - for a start it is ...
  • Lee #87 camera filter. http://www.leefilters.com/index.php/camera-directory/camera-dir-list/category/infrared Actually  it is 730nm, I see.   I just cut a small rectangle and taped it on the back ...
  • At 7.5mm the shock would have to be horrendous to look conspicuously out of focus on an IR shot (and that's writing as someone who had a dreadful E-PL2 and poor E-PM1, shock-wise).  We can't rule ...
  • Yes, if you can focus the Samyang (i.e. not at the end stop) and get sharp pictures at the same f/# with another lens, your filter is very likely OK. Ken
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