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03-30-2017, 06:36 PM   #1
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Just picked this ring flash up... I hope it works well

I couldn't resist at this price:

Lester Dine Auto Macro Ring Light Flash for Pentax | eBay

I hope it works out well for me. I have always wanted a ring flash.

Plan is K-3 and DFA 100 WR or perhaps some other lenses and my A-series de-glassed 2x extender (25mm tube).

I think it is this flash with minor changes - including the addition of a non-ring flash head on the ring and a selector switch to choose between them.


Last edited by UncleVanya; 03-30-2017 at 06:46 PM.
03-30-2017, 07:09 PM   #2
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The power pack/control unit looks identical to my Sunpak Auto DX8R. The foot is correct at a PT-2D, the same as mine. As you said, the Sunpak doesn't have that extra flash head.
03-30-2017, 07:15 PM   #3
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QuoteOriginally posted by p38arover Quote
The power pack/control unit looks identical to my Sunpak Auto DX8R. The foot is correct at a PT-2D, the same as mine. As you said, the Sunpak doesn't have that extra flash head.
How do you like yours? Is it reasonably easy to use? I'm comfortable with manual and auto mode flash and I suspect not a lot of problems in that respect - I'm curious about attaching and how much control Full to 1/16 minimum power gives for Macro.
03-30-2017, 07:18 PM   #4
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Yes, based on the Sunpak flash. Not as common as the Lester Dine Yuzo/Nissin ring flash or the older Sunpak flash system with a wall mounted AC power unit. The older flash has some DIY looking switches on it to change from the ring to the point light.

03-30-2017, 07:32 PM   #5
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I have had one for a couple of years. The 1/16 power has been the most useful power setting when using it for butterfly and small insect pics. I shoot in manual mode, using the dine 100 2.8, and the the FA 50 macro. Of course you will need the appropriate step up ring to fit your lens.
03-30-2017, 07:37 PM   #6
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QuoteOriginally posted by tscip22 Quote
I have had one for a couple of years. The 1/16 power has been the most useful power setting when using it for butterfly and small insect pics. I shoot in manual mode, using the dine 100 2.8, and the the FA 50 macro. Of course you will need the appropriate step up ring to fit your lens.
Do you know what the ring size is by default?
03-30-2017, 11:27 PM   #7
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QuoteOriginally posted by UncleVanya Quote
How do you like yours? Is it reasonably easy to use? I'm comfortable with manual and auto mode flash and I suspect not a lot of problems in that respect - I'm curious about attaching and how much control Full to 1/16 minimum power gives for Macro.
To be honest, it's been a while since I've used it. I think I used it in TTL mode with my *istD. I was mainly using my Pentax AF080C (again with the *istD) until it failed.

I'll do some tests with the Sunpak tomorrow after my amateur radio club's Committee meeting (maybe even tonight if I finish the club's accounts).

03-31-2017, 12:34 AM   #8
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QuoteOriginally posted by UncleVanya Quote
Do you know what the ring size is by default?
52mm with 0.75 pitch. You can download the manual for the DX-8R here:

http://www.cameramanuals.org/flashes_meters/sunpak_auto_dx8r.pdf

The Guide Number for the point flash will be higher.

The above manual lists the GN (meters) @ ISO 100 as 8.

The GN on the later Nissin/Yuzo the ring is rated (meters) at 14 @ ISO 100. The point flash 28 @ ISO 100.

So maybe the point on the Sunpak is GN 16? I guess you could check that with a flash meter.

The Yuzo only has a 1/16 power setting. You can always try using the Auto mode (sensor on foot). I can get good results with the Yuzo just as long as you are aware of how much (if any) light the background is contributing.

Last edited by Not a Number; 03-31-2017 at 06:11 AM. Reason: grammer
03-31-2017, 05:47 AM   #9
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I have the Sunpak version. It's a great flash for macro. I mostly use manual mode, setting it at 1/16 to 1/4 power for insects, flowers,etc. It takes a little experimenting. It will make a world of difference in your macros.
03-31-2017, 07:46 AM   #10
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Thanks all. This is helpful info.
03-31-2017, 11:53 AM - 1 Like   #11
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Have fun with the light. I picked up a Bolt VM-160 LED Macro Ring Light from B&H over a week ago and was just able to unbox it and try it out today. What a useful piece of equipment! I took some samples only using one setting and the constant light and it works great. I'll probably end up doing far more macros than before, it should be really nice doing nature macros.
04-03-2017, 03:15 PM   #12
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I think I hit the Jackpot! This unit is unused. It is so new that it couldn't look newer unless it had the original box. As it is I have the original instruction manual still stiff and shiny. I loaded it up with batteries and took it for a couple of test button presses. Everything works great. Now if I could only find my 49mm to 52mm step ring...
04-03-2017, 07:07 PM   #13
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Is that the Lester Dine manual? Does it list the GN for the point flash? I wouldn't mind a PDF scan of the manual for the Kiron Klub Yahoo Group. They have a scan of the Yuzo/Nissin flash manual. You scored well!
04-04-2017, 07:16 AM   #14
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QuoteOriginally posted by Not a Number Quote
Is that the Lester Dine manual? Does it list the GN for the point flash? I wouldn't mind a PDF scan of the manual for the Kiron Klub Yahoo Group. They have a scan of the Yuzo/Nissin flash manual. You scored well!
It is. I will see if my scanner is up to the task. I can shoot a quick picture of the guide number info later today.
04-04-2017, 02:51 PM   #15
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QuoteOriginally posted by Not a Number Quote
Is that the Lester Dine manual? Does it list the GN for the point flash? I wouldn't mind a PDF scan of the manual for the Kiron Klub Yahoo Group. They have a scan of the Yuzo/Nissin flash manual. You scored well!

I haven't tried the scanner yet - but here's some info on the point source vs. ring:

EDIT: I just found the section on GUIDE number
ASA 100 (in ??? I'm guessing not meters)
Ringlight: 50
Pointlight: 95
5 stops of power range (Full, 1/2, 1/4, 1/8, 1/16)
Duration 1/420th - 1/5000th of a second (depending on power)
Flashes AA Alkaline (100 @ full power, 900 @ 1/16th)
Recycle 8 seconds from full, 0.3 seconds from minimum

QuoteQuote:
Ringlight is best suited when:
  • training a novice photographer
  • talking photos using a mirror
  • full disclosure of the oral cavity is required
  • photographing deep wound sites

Pointlight would be best for:
  • Photographing dental models
  • full face and/or profile views
  • gum tissue
  • lesions
  • dimensional effect on topical surfaces
Additional info for TTL mode says the following:
Ratio ASA 100 ASA 64 ASA 200
1:1 f/32 f/22 f/22**
1:2 f/32 f/22 f/22**
1:3 f/22 f/16 f/22**
1:10 f/16*** f/11*** f/22**

** = f/22 for all distances and ratios for ASA 200 for simplicity
*** = Only use pointlight for this

Manual mode Ringlight (ASA 100, 100-105 macro lens)
Ratio power f/stop
1:1 FULL f/32
1:2 FULL f/32
1:3 FULL f/22
1:5 FULL f/16
1:10 FULL f/11

Manual mode PointLight (same asa, etc.)
Ratio Power f/stop
1:1 1/4 f/32
1:2 1/4 f/32
1:3 1/2 f/22
1:5 1/2 f/22
1:10 FULL f/16

It also suggests that if the flash is used with a 50 ish mm macro you should drop the power by 1 stop. So FULL = 1/2, 1/2 = 1/4 etc.

This data is a little hard to follow particularly the 200 ASA but if you take it at face value it appears that the pointlight is about 2 stops brighter than the ringlight. My own quick tests with the unit seem to confirm this at moderate magnification and distance.

Model 2000

Last edited by UncleVanya; 04-04-2017 at 03:08 PM.
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