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Forum: General Photography
06-18-2015, 06:44 PM
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Not possible - I cloned it out along with the footprints.
So what's the final verdict - is fast glass necessarily better all else being equal?
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Forum: General Photography
06-18-2015, 01:41 PM
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Sometimes less is more...
...a classic Fraunhofer doublet, f/8, 1000mm, No special technique. The moon was there so I just spot metered on it and pulled the trigger for a single RAW file. Got rid of CA in PS. Just a snap shot really.
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Forum: General Photography
06-17-2015, 09:07 PM
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And don't forget the final polishing done on the thighs of virgins at a remote Shinto temple high in the mountains of northern Japan.
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Forum: General Photography
06-17-2015, 08:28 PM
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It was my understanding that this was not custom but simply one of the optional standard methods they use in preparing optics.
They did not do their own coating if I recall right. I've been told Taiwan is full of small operations like this.
About $1100 for the optics only not the entire scope. Relatively cheap compared to a 600mm Canon.
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Forum: General Photography
06-17-2015, 03:47 PM
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I told the builders that this optic was not for astro work but only for terrestrial photography of very colorful birds at prime focus where accuracy was essential.
They assured me no problem. Simply start with a 90mm optic, optimize that and then mask it down to a maximum effective clear aperture of 80mm.
They said if I do see obvious CA it's much more likely to be the sensor than the optics. As I recall the the front objective assembly which could be simply screwed directly into any appropriate tube cost about $1100.
It was made by a small custom shop in Mainz Germany.
So far I'm a happy camper.
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Forum: General Photography
06-17-2015, 01:20 PM
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Ohara FPL-53 fluorite and the other two elements are Schott.
Another thing to consider - simplicity. The Sigma 500 prime, for instance, has 14 elements. While all those elements correct aberrations they may also, in turn, introduce there own.
Same glass but with the tiny Q-S1 sensor hanging off the back end. This gives me approx 60x apparent magnification...
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Forum: General Photography
06-17-2015, 04:37 AM
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I'll throw this out as I don't think it's totally irrelevant to this thread.
For my bird shots I use a 560mm, f/7.1 (fixed - no diaphragm), three element APO triplet scope.
Under actual real world use it easily out-resolves any other glass that I have including the 50mm Zeiss Zk and the Pentax FA 35.
The following files are nothing special - originally shot in jpg, not RAW, on the old K20D with the usual PP that I would apply to any file.
Both at a distance of about 25 feet or so.
Full frame and crop.
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