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03-15-2016, 02:35 PM   #1
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Dine ringflash thread size?

Recently I picked up an older Lester Dine ringflash and I'm trying to figure out the thread size. It's smaller than 49mm and bigger than 43mm; does anyone have an idea? I need to find an adapter that'll allow it to screw into a 49mm filter ring. Thanks!

03-15-2016, 03:00 PM   #2
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Easiest thing is to take it down to your neighborhood hardware shop and ask them to put a ruler or micrometer on it.

If it isn't 49mm that would be very odd. Is it possible there is a part or adapter missing?
03-15-2016, 03:54 PM   #3
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If it's the Yuzo/Nissan or Sunpak flash the ring should be for 52mm. I have no idea if it is the flash with the AC power supply and long grey cable.
03-15-2016, 05:47 PM   #4
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Do you have a small metric ruler, you should be able to figure out the size quite quickly. As far as filter step ring sizes go, it's 43mm, 46mm, 49mm, 52mm and so on. If the measured diameter falls between 46mm and 49mm, it's probably a Series 6.5 according to this site: Series filter sizes - IV / V / VI / VII / VIII / IX

03-15-2016, 05:50 PM   #5
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Don't know specifically about the Dine flash. But there is a 46mm filter size. You can get a pretty cheap step down adapter on ebay.
03-15-2016, 06:26 PM   #6
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I thought it was the same as the sunpak, which is 52mm.
03-15-2016, 07:14 PM   #7
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From doing some poking around it looks like the Dine ring flashes have been around since the 1950s. So it is quite possible that there were different filter sizes through the years and versions. Unfortunately it may be a bit of trial and error if there is no documentation.

QuoteOriginally posted by excanonfd Quote
Do you have a small metric ruler, you should be able to figure out the size quite quickly. As far as filter step ring sizes go, it's 43mm, 46mm, 49mm, 52mm and so on. If the measured diameter falls between 46mm and 49mm, it's probably a Series 6.5 according to this site: Series filter sizes - IV / V / VI / VII / VIII / IX
This is good information. I can remember running across those type filters eons ago.

03-19-2016, 12:19 PM   #8
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Thanks for the replies and suggestions.

QuoteOriginally posted by Not a Number Quote
I have no idea if it is the flash with the AC power supply and long grey cable.
Yes, it's the version with the AC unit and gray cable...and the 46mm adapter that arrived today is just a bit too large. Just for grins I fitted the flash to the 50mm lens on my Agfaflex IV and once again the flash threads were too small in diameter.

The flash did come with an adapter but it's to step up to a 62mm filter ring...quite a bit larger than Pentax's 49mm.
03-19-2016, 12:35 PM   #9
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Use the adapter with a 49 to 62mm step-up ring?
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