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FORUMS Photography Talk by Genre Macro Talk 
Thread started 02 Jun 2017 (Friday) 11:19
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New macro diffuser for MT24-EX

 
Dalantech
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Sep 30, 2017 03:31 |  #61

JasonC007 wrote in post #18463002 (external link)
...The quality of light compared to my diy versions is better due to the fact I have created a graduated face which eliminates the hotspot from the centre of the flash, whereas my diy versions used a flat face which still showed the hotspot but also reduced light.

Hey Jason,
If you have time I'd like to know the difference, in stops, between a bare flash head and your diffusers. What I do is set up a test subject (in my case a yellow metallic toy car my son gave me) and set the camera to F11, ISO 100, and whatever the max shutter sync speed is for your camera (1/250 for the Canon 80D) and take a shot at 1x. Then set the flash to manual mode and change the power out until I get close to the correct exposure (but not over). Then add the diffusers and change the power out again until I get close to the correct exposure again. It will kinda give me feel for how efficient my diffusers are. I think the last time I tested mine I was losing about two stops.


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JasonC007
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Sep 30, 2017 12:37 |  #62

Archibald wrote in post #18463147 (external link)
Thanks, Jason.

Sorry, I wasn't trying to challenge you. It was an honest question. I have made many diffusers for use with flashes for the 100mm L and MP-E 65mm macro lenses. The results have generally been good IMO, but often I wonder if they could have been better. I see examples of the macro work of others and sometimes am really impressed with the lighting. That is to say, I suspect my lighting could have been better.

I use a tiny toy figure to test my lens/flash/modifier rigs. This allows me to check qualitatively for hot spots on the subject, and the shadows. I feel it is a somewhat rough way to test the lighting. My experience is that the LQ (lighting quality ;-)a) varies with distance and subject. Some of my test and in-the-field results baffle me.

That's why I thought I would ask about ways to test macro flash lighting. Maybe nobody has given it serious thought, and if that is so, that is fine, for now.

I didn't think you was challenging me, I guess my reply might have sounded like I thought you was :)

Basically, yes I do the same as you, I test them in the real world by just using them. What I also do is photograph a shiny steel ball and focus on the flashes, this then gives me an exact representation of what will be reflected and also where the hotspots are.


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JasonC007
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Sep 30, 2017 12:37 |  #63

Dalantech wrote in post #18463251 (external link)
Hey Jason,
If you have time I'd like to know the difference, in stops, between a bare flash head and your diffusers. What I do is set up a test subject (in my case a yellow metallic toy car my son gave me) and set the camera to F11, ISO 100, and whatever the max shutter sync speed is for your camera (1/250 for the Canon 80D) and take a shot at 1x. Then set the flash to manual mode and change the power out until I get close to the correct exposure (but not over). Then add the diffusers and change the power out again until I get close to the correct exposure again. It will kinda give me feel for how efficient my diffusers are. I think the last time I tested mine I was losing about two stops.

Yes no problem, I'll have a go at this tomorrow.


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Archibald
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Sep 30, 2017 14:07 |  #64

JasonC007 wrote in post #18463433 (external link)
... What I also do is photograph a shiny steel ball and focus on the flashes, this then gives me an exact representation of what will be reflected and also where the hotspots are.

Interesting - could you describe in more detail? How big is the steel ball?


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JasonC007
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Oct 01, 2017 05:09 as a reply to  @ Archibald's post |  #65

The steel ball I use is 25mm in diameter. This is the reflection I get when focused on the diffusers themselves, it lets me see how even the light is.


First picture is the diffusers exposed correctly so I can see them properly.

Second picture is the same but with the exposure increased until it blows, however this particular picture had 2 different diffuser faces I was testing which is why they are uneven. The one on the left is newer/thinner/brighter​. But you can see that it blows not just in the centre but also around most of the edge, meaning you don't get one particular concentrated hotspot.

Third picture is bare flashes.

IMAGE: https://farm5.staticflickr.com/4421/37050522602_7441aaef7e_b.jpg


IMAGE: https://farm5.staticflickr.com/4442/37050522552_438c17b880_b.jpg

IMAGE: https://farm5.staticflickr.com/4359/37032107456_6ff4d2899d_b.jpg

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Lester ­ Wareham
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Oct 01, 2017 05:32 |  #66

Out of interest does your diffuser design cover the focus light (I am guessing it does).


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Oct 01, 2017 05:37 |  #67

Lester Wareham wrote in post #18463818 (external link)
Out of interest does your diffuser design cover the focus light (I am guessing it does).

Yes it does to provide a bigger diffusion area, however because the faces are quite thin, the focus lights are more usable than when using a thicker material. The MT26 and the Yongnuo have brighter focusing lights which help. Plus I am also designing a holder for a flashlight which will attach to this system. I may even provide the light because I've found a quite small and bright light which is extremely lightweight.


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Oct 01, 2017 08:16 |  #68

JasonC007 wrote in post #18463810 (external link)
The steel ball I use is 25mm in diameter. This is the reflection I get when focused on the diffusers themselves, it lets me see how even the light is.


First picture is the diffusers exposed correctly so I can see them properly.

Second picture is the same but with the exposure increased until it blows, however this particular picture had 2 different diffuser faces I was testing which is why they are uneven. The one on the left is newer/thinner/brighter​. But you can see that it blows not just in the centre but also around most of the edge, meaning you don't get one particular concentrated hotspot.

Third picture is bare flashes.

QUOTED IMAGE


QUOTED IMAGE


QUOTED IMAGE

OK, thanks. That is an interesting way to test the diffusers.


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Oct 04, 2017 07:19 |  #69

JasonC007 wrote in post #18418065 (external link)
Hi Toby,

I am charging £45+postage. I'm currently making a couple of tweaks and then they will be available again. I've also bought another printer which should be up and running by next week which means I'll be able to make the kits a lot quicker, currently it takes about 40 hours to print a kit!

So I have been following the Prusa printer, and I see they now have the MK3 for preorder. I am glad I didn't jump right in on the MK2S, this new one seems like a good step up.


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Oct 05, 2017 09:19 as a reply to  @ TeamSpeed's post |  #70

Yep the MK3 looks good, I went to see it last week. I'll most likely get one as a 3rd printer and upgrade my other 2 to version 2.5 :)


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Oct 05, 2017 09:27 |  #71

JasonC007 wrote in post #18463434 (external link)
Yes no problem, I'll have a go at this tomorrow.

I've not forgotten about this, I've been unwell for a couple of days plus my computer went bang which I'm waiting to be fixed but working on my laptop has slowed me down! Will try and take the test shots tomorrow or the weekend.


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Oct 05, 2017 11:02 as a reply to  @ JasonC007's post |  #72

I thought about the 2.5 option, I think it would be $50 less to get the mk2s and get the upgrade at a special price of $99, but for $50, might as well get the whole thing. It most likely will be my Christmas gift to myself this year!


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Dalantech
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Oct 06, 2017 02:22 as a reply to  @ JasonC007's post |  #73

Hope you get to feeling better! There's something going around here that I've been fighting all week, but I'm still on my feet.


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Oct 06, 2017 03:46 |  #74

TeamSpeed wrote in post #18466539 (external link)
I thought about the 2.5 option, I think it would be $50 less to get the mk2s and get the upgrade at a special price of $99, but for $50, might as well get the whole thing. It most likely will be my Christmas gift to myself this year!

If you haven't bought one yet then the MK3 is the best option. It will cost me 50 euros to upgrade my latest MK2 and 150 to upgrade my older one so I'm happy with that, the MK2 prints really well anyway.

If you want a MK3 for Christmas you'd better pre-order now as I expect the shipping will start to get to 3-4 months with the amount of orders they are taking!


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JasonC007
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Oct 06, 2017 03:48 |  #75

Dalantech wrote in post #18466992 (external link)
Hope you get to feeling better! There's something going around here that I've been fighting all week, but I'm still on my feet.

Thanks! Yes I'm still on my feet just about, I have no choice running my business but I'm just a little slower :)


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