I have been wanting to buy a focuser for video work, as well as to aid focusing for macro photography. I wanted a system which was not too large, preferable using only one mounting rod, was not too expensive and works well.
I do have to make the disclaimer that I have not tried any other focusing systems out there; previously I was using the manual focusing lever mounted onto my helicoid focuser, which is useful for macro focusing but not effective for video.
I decided that I wanted to get the D|Focus V4, as it looked well made, was not too expensive and seems to work fairly well from reading about it online. One came along on eBay and so I bought it.
I also had to buy the focusing gear for mounting onto the lens, as my focuser did not come with one. The D|gear comes with 4 different sets of legs of various lengths to support the gear on the lens; I used the second longest set (you use 7 legs to mount the D|gear on the lens).
I also bought the D|mount single rod mounting system, which mounts onto the base of the camera and allows the D|focus focuser to be mounted next to the camera to turn the focusing gear.
There is a white disc on the side with the focusing know. This can be marked for example for the subject in the foreground and for the subject in the background, which will allow for accurate change of focus from one subject to another.
As you can see, the individual components are not too heavy, which makes the system hand-holdable.
The D|mount does have some scope for adjustment to fit different cameras of different sizes; I used the basic setup it came in. On the base of the D|mount, there is a female 1/4″ screw thread for mounting Arca mount plates – I’ve mounted my Peak Capture mini Arca plate on it (not pictured).
The D|mount V4 focuser does feel well made, and seems to adjust focus very smoothly. I like it. In fact as it works so well, I have changed my system by removing the manual focusing handle and the other adapters, and am just using this with the Coastal Optics 60mm F4 APO mounted onto the Nikon G-Micro 4/3rds helicoid focuser now.
As I was testing this outdoors for UV-video, it started to rain. Hence I have not been able to make any videos to demonstrate it in action. But it certainly makes focusing more accurate and seems to allow for the Olympus E-M5’s IBIS to do its magic to stabilise the video. When I get more time, I will post a UV or IDS video shot with this setup, and also about talk how well it works for macro photography.