Unlike traditional rectangular Fresnel flash heads, the Godox H200R round flash head produces an even circular lighting pattern with a nicer transition in relation to fall off towards the edges. However, compared to the Fresnel head that is supplied with the Godox AD200, you do lose a bit of power when choosing to use the H200R.
I started using the H200R with the Magbeam Tele Lens so that I could throw the light over a further distance and get a nicer looking light pattern. Without getting into the power debate and the science of Fresnel lenses, what I can say is that the light does travel further and by combing the H200R and the Magbeam tele lens, you can get some nice results without that horrible line when using the rectangular flash head that come with the Godox AD200.
As I have really started getting in to learning how to use hard light, the idea of being able to throw light over greater distances has enabled me to experiment with different types of reflector, but many of the modifiers are not lightweight or small enough for my requirements and the issue with Magmod is the cost. Magmods Magbeam is a clever device and very practical in use, but the price! Come on folks at Magmod, is it not time to reduce the price of your gear and provide a win win sittuation for everyone?
As you can purchase the Magmod tele lens on its own, when I saw a new one on Ebay for a fair price, I decided to get one. I started experimenting with MM lens and concluded that there is range in terms of distance that the lens is most optimal at by moving the lens further or nearer towards the head of the flash. Working out the best distance is just trial and error and a light meter makes the process easier. Through experimentation, I have learned that the Godox AK16 magnetic filters provide the ability to step up and down the distance of the Fresnel lens in relation to the head of the H200R really easily as they are magnetic. The issue with the Magmod Tele lens was connecting it and holding it in place. I concluded that all I need was a small circular Fresnel lens that I could place in or on the AK16 filter holder and it should work.
After a few hours of searching on the web, I found the exact size in diameter I needed. The Lens-shop shipped my oder as a pair, yes, thh supplier is based in China, but I think I paid about £12 and they arrived in about two weeks and China seemed to be the only place I could order the size and shap that I required. When I stack three AK16 filter rings, with the Fresnel lens on the third filter, I am effectively gaining an extra stop of light when I take a measurement with a light meter, so they do work, you just need to make sure the grooved lines side of the lens faces inwards towards the light source (the flash). These little circular Fresnel lenses are ideal in terms of price and size and I am going to post a video shortly showing the how the hack works and what can be achieved with them. The Magmod Tele lens is more powerful (1.7 stops measured with light meter) but the cost and size of the Magmod almost make it redundant now. Personally, I think being able to gain an effective stop of light from these little circular Fresnel lenses is incredible in relation to their size and price.
I will be uploading a video with light meter reading examples hopefuly by the end of the day: 25/3/2021
For any one interested in the 70mm diamiter Fresnel lenses they can be ordered from Ebay from the Lens-Shop. you get two for £12.50 Linke Here: https://www.ebay.co.uk/itm/2pcs-70mm-Dia-Round-Plastic-Sola-Fresnel-Solar-Condensing-Lens-Card-Focal-Length/182582369884?ssPageName=STRK%3AMEBIDX%3AIT&var=690948933810&_trksid=p2057872.m2749.l2648
If you have more than a few Godox AK filter rings, you can experiment by varying the distance of the fresnel to the H200R flash head by stepping up the Godox Ak16 filter rings. From my experimenting 3 rings with the Fresnel on the last outer ring will effectivly give you an extra stop of light.
Any questions? drop me an email and I will try to answer them.
Update Thursday 25 March 2021 16.43. Had intended to upload video of todays outing to Hetchell Woods, but when the light was to bright for video and I went to grab an ND, I learned that I had left it at home like an idiot. I will try again tomorr
This video won’t win any Oscars, but I hope it provides an insight as to how using the 70mm diameter Fresnel lens and three Godox AK16 Filter rings provides effectively an extra stop of power. The Godox AD200 was set at full power at 20feet from where I took light meter readings for both tests. My Lumu iPhone light meter did not video well, so I just read out the readings. Sorry for the poor quality in video, the winds kept picking up and the sun kept going in and out.
The ambient light levels at f/5.6 would have been ISO betwenn ISO100 & ISO200 and shutter at 1/320th & 1/400th as the light levels kept changing (clouds over the sun) I set 1/200th on the light meter, as thats in the middle of where most camers flash sync speed is. In order to try a keep things consistant, I decided measuring the flash power would probably be the most helpful.