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 Post subject: Camera Filters to Aid Gem ID
PostPosted: Tue Aug 13, 2013 2:19 pm 
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Joined: Sat Jul 06, 2013 8:34 pm
Posts: 15
I am thinking about buying multiple square filters made for photography (e.g., Cokin or similar) with the idea of rigging up a free-standing device as well as a microscope attachment for using the filters. (It seems to me that the square filters would be easier to handle and swap out than the round filters that have to be screwed in place each time.)

By way of background, I’ve done some homework on this already. I’ve read a number of posts on this forum regarding color filters, photo filters, and polarizing filters for microscopes. I’ve also looked at various sites on Wratten filters.

So, now the questions:
Does this even make sense?

Has anyone tried something like this?

I understand that blue filters are useful for seeing curved lines in yellow and orange synthetic corundum, green for pink and red corundum, and yellow for synthetic blue corundum. But are specific shades of these colors (maybe a la Wratten) recommended?

Could a Wratten 23A filter do double duty with a refractometer and for seeing curved lines in synthetic sapphire?

What kind of filter would be used with daylight (bulbs) to “correct” to incandescent light (for seeing color change)?

What kind of filter would be used with incandescent light to “correct” to daylight (for seeing color change)?

What other photo filters (and why) might be useful (especially to a novice) as aids in gem identification?

Any ideas/input greatly appreciated! Thanks!


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 Post subject: Re: Camera Filters to Aid Gem ID
PostPosted: Fri Aug 16, 2013 12:47 am 
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Joined: Mon May 14, 2007 11:00 am
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Location: Monterey, CA
Don't waste you time.
Call Mineralab and get a complete set of Hanneman Gem Filters. Cost $250.


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 Post subject: Re: Camera Filters to Aid Gem ID
PostPosted: Fri Aug 16, 2013 4:32 am 
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:P :D

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 Post subject: Re: Camera Filters to Aid Gem ID
PostPosted: Wed Sep 04, 2013 2:23 pm 
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Joined: Sat Jul 06, 2013 8:34 pm
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OK, so I have accumulated, from various sources, what I think are all of Dr Hanneman's filters.

Nonetheless, I like to tinker and I would still be interesting in seeing some discussion about the original questions about selecting and using camera filters to aid in gem id.

Any guidance? Thoughts?

Thanks!


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