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Forum: Flashes, Lighting, and Studio
02-17-2011, 03:09 PM
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Apologies - I've been very busy with work - here is quick couple of pics inside. The Capacitor is simply a 10uF one, rated to 16V.
I'll get some better ones when I have more than 10 minutes to spare...
The very last pic is taken with the Nikon Trigger reassembled and back on the camera - its a 2 flash shot taken using X-Sync @ 1/180.. and from my very untrained eye - doesn't appear to have any shutter shadow at all.
The full size images are up on my website at http://adr1an.net/Flash-Trigger-Mods if someone wants some high-res ones.
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Forum: Pentax Camera and Field Accessories
06-14-2010, 12:07 PM
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those are pretty good results Douglas. just a bit overexposed.
Benedict, as far as IQ degradation using the adapter is concerned, there are several things I want to mention about it.
1. there are several instances that a hazy glow/halo color effect would occur on a few areas around the image. this glow is prevalent at scenarios with significant light source. this occur at wide open from MFD to infinity.
2. there are traces of fringing on the highlighted areas but not that worse. there are a few instances that CA do occur and CA in the blue channel can be difficult to correct or impossible unless done with further extensive work, although not that often.
3. sharpness and resolution could be slightly affected dependent on per actual lens used.
mind you that I used a Vivitar S1 90/2.5, which has an excellent resolution and sharpness, so any IQ degradation that the adapter might cause would not be much of an impact as compared to other lenses. but still would be just barely slightly less if you really want to get the maximum potential of the lens. this effect is no different from that of a 1.4 TC + great lens combo.
now the notable effects that the adapter could cause.
1.> increased focal length rendering due to optical magnification. est magnification of 1.4x.
2.> OOF background blur and circles on OOF areas due to magnification. this is an expected effect and not an anomaly. it's more like the same OOF effect shown on an 120mm or 135mm lens.
3.> larger DOF. I noticed that the background has more definition with the glass element compared to without the glassless one.
4.> a stop or over slightly slower.
recommended usage for the adapter:
1.> for optimal macro use from wide open to all apertures - use glassless adapter.
2.> for excellent macro to telephoto results with a longer focal magnification by a glass adapter - use f4 to f8. at best would be f5.6 - f8. sometimes f4 is enough to get rid of the glow.
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Forum: Pentax Camera and Field Accessories
06-14-2010, 08:39 AM
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Time to kick some life in this thread. Last Thursday my Canon FD 200mm f4 macro 1:1 arrived and the adapters had arrived just a few days before. Unfortunately, the weather turned bad at once. Not until today did I get a fair chance to try it out door. Still pretty windy, so the butterflies were absent, but there were some bumble bees to test it on. Shot with the Pentax AF160FC ring flash an monopod. ISO 200/400, 1/180, f11 or f16. No cropping and only slight exposure correction and contrast increase since it is eassy to miss out the exposure 1/2 to 1 step when running the ring flash in manual.
With the adapter this is presubably something like 280-300mm and with >1:1 max macro ratio. Have not measured it yet. I got two adapters intending to take the glass out of one of them to get a macro only adapter that does not focus to infinity, but retain unchanged IQ and bokeh. But this is just a first test with the adapter including glass.
It was easier to work it than I thought. Running on M, setting the apperture on f11 or f16, the ring flash on full +0.5, composing, focusing, close down (the adapter have a close down ring), shoot.
Now if someone can send me their SMC-Pentax A*200mm macro over the summer I can make a shoot out...
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Forum: Site Suggestions and Help
05-20-2010, 08:17 PM
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How's it look now?
Next up on the agenda is cleaning up the reputation popup menu :)
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