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03-18-2011, 04:18 AM   #1
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Macro Ring flash

Hey

Just got my 120mm 645 Macro.. wee

But what Macro ring flash, would you buy ?

Is this useful, or to cheap ?
Macro Ring Flash LED Light for Canon/Sony/Niko??n Lens on eBay (end time 12-Apr-11 04:26:10 BST)

03-18-2011, 04:51 AM   #2
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I think the way to achieve to get the best results would be to things the proper way, buy a Pentax AF160FC ringflash.
03-18-2011, 08:53 AM   #3
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If you have already a flash, you could consider a Ray Flash ring adapter. It works well for me.
03-18-2011, 09:08 AM   #4
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Check out the macro forum on fredmiranda.com. There is a section for photograph ers to show their setups, there is a lot of discussion on flashes and flash difusers. This discussion is in reguards to digital, but there is a lot that applies to film also.

good luck,

Gary

03-19-2011, 01:12 AM   #5
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Go for full monty

Jesper,
I bought a LED ring light called "Flex-ring 6400" a couple of years ago:
Ring Lights and Slave Flash Products for Digital Cameras

IIRC, It was only adequate for f/8 at ISO 400 for flash blinks. Unless LEDs have become vastly more powerful since then, I doubt the one you look at will do more, despite toting GN=15.
With the Flex-Ring I couldn't do useful work with moving subjects. For stationary subjects I switched to long exposures and continuous light from the flash. That worked fine.

Regarding the AF-160FC, I'm not entirely sure you will get TTL metering with the original 645. Pentax claims the ring flash will support both P-TTL and TTL, but they do not tell which version of TTL.

The original 645 use the old, analog TTL system implemented in Pentax LX and Program-A. The flashes to match were the T-series and C-series. With the advent of autofocus, Pentax changed the way their flashes worked. They introduced a fourth pin on the shoe to communicate digital information, and changed something in the way the other pins work as well. The flashes in the FTZ series send voltage spikes through the hot shoe that will kill the TTL cirquitry in older cameras. I learned that the hard way, that's why I'm a little wary about the compatibility with the AF-160FC ring flash.

One absolutely safe option is to look for the Pentax AF140C used. This ring flash use LX-era analog TTL compatible with the original 645.
03-19-2011, 03:35 AM   #6
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QuoteOriginally posted by alunfoto Quote
Regarding the AF-160FC, I'm not entirely sure you will get TTL metering with the original 645.
In light of this apparent lack of information I will test my AF160FC ringflash with my pentax 645 and 67 cameras, stay posted.

Though I can say that the AF160FC has a perfectly usable Manual mode, which bypasses the need for TTL and leaves exposure completely to the photographer. though the AF160FC does limit the manual power settings to 1/16, 1/4 and 1/1 power - the light distribution ratios between the two flashheads remains proportional. In TTL or P-TTL the AF160FC has a much wider flash power setting range to call upon: going as low as 1/128th all the way up to 1/1
03-19-2011, 04:23 AM   #7
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Thanks for all your posts.

The AF160FC is more then I'm ready to pay.. LED's are useless.. I think I'l try to find a used AF140C..

Thanks agin.
03-19-2011, 05:15 AM   #8
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Hi Jesper,

If I'm correct, the opening in the older 140C ring flkash only came and works with filters size up to 58mm, not the 67mm that the Pentax 120 f4 645 macro requires.

Dave

03-19-2011, 05:27 AM   #9
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QuoteOriginally posted by DandA Quote
If I'm correct, the opening in the older 140C ring flkash only came and works with filters size up to 58mm
the AF160FC that I use only has adapter rings for lenses up to 62mm, however on my sigma 180mm f/3.5 has a filter diameter of 72mm so I use a 72>62mm reducing adapter and I have seen no vignetting at any aperture with the ringflash mounted - I tested this on APS-C and full frame(film)camera. I have never used the AF160FC with the 120mm f/4 macro on my Pentax 645NII - I think it's time that I did.
03-19-2011, 08:08 AM   #10
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QuoteOriginally posted by Digitalis Quote
I have never used the AF160FC with the 120mm f/4 macro on my Pentax 645NII - I think it's time that I did.
I've used it with 645D only. No vignetting with the crop factor, at least.
03-19-2011, 08:24 AM   #11
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QuoteOriginally posted by DandA Quote
Hi Jesper,

If I'm correct, the opening in the older 140C ring flkash only came and works with filters size up to 58mm, not the 67mm that the Pentax 120 f4 645 macro requires.
Dave is correct, unfortunately. I just skimmed the AF140C manual at the Pentax USA website, and while it mentions compatibility with 645, it only describes its properties with the 75mm normal lens.

Since 58mm is the largest adapter available, you'd have to use reduction rings like Digitalis describes. However I believe it's a bit steep to expect no vignetting with a 67mm diameter lens.

Ring flashes was a weak link in the lineup with Pentax for many years. Maybe there's something from the third party makers like Sigma or Metz?
03-19-2011, 05:23 PM   #12
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QuoteOriginally posted by alunfoto Quote
Maybe there's something from the third party makers like Sigma or Metz?
There are, but in an exhaustive side by side study I did of the competing products, I found the soft light quality from the Pentax AF160FC to be superior for portraiture and macro work.

The Sigma and Metz ring flash options have many of the bells and whistles of their standard line of flashes. But for me, the quality of light is extremely important. The sigma and metz flash units use flash heads that are too small (40mm, they use reflectors to channel the light around the head) the flash heads in the AF160FC are 120mm on each side. The bigger the light source = the softer the shadows will be, which is an important factor for portraiture along with the impressive power. The AF160FC has it has more power than both the metz or the Sigma. I use it with my SMCP-K 50mm f/1.2 and it delivers superb results.
03-21-2011, 02:16 AM   #13
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QuoteOriginally posted by Greves Quote
The AF160FC is more then I'm ready to pay.. LED's are useless.. I think I'l try to find a used AF140C..
140C is cheaper of`course, but has 49, 52, 58 rings only.
Useless for medium format lenses with 67 diameter.
And has no P-TTL - you`ll have problems on 645D with correct exposure.
I`ve sold it when bought 160FC with P-TTL and 49, 52, 58 and 67 rings.
03-21-2011, 04:21 AM   #14
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QuoteOriginally posted by managger Quote
140C is cheaper of`course, but has 49, 52, 58 rings only.
Useless for medium format lenses with 67 diameter.
And has no P-TTL - you`ll have problems on 645D with correct exposure.
I`ve sold it when bought 160FC with P-TTL and 49, 52, 58 and 67 rings.
Its not for a 645D, its for the original 645.
03-22-2011, 02:02 PM   #15
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The AF160FC also has 67mm rind, I used it on DA*50-135mm.
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