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lmackreath

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  1. No its not that extreme. If you want to change it you can go into the stabilser options in the menu and the focal length settings are in their. The annoying thing is that even if you choose not to change the focal setting the camera will ask you to confirm the setting each time you turn it on..a possible future firmware update would be great to remove this..
  2. Ok received the Zhongyi lens turbo yesterday along with a normal nikon to m43 dumb adapter to use with the nikon sigma 18-35 with the GH5. First impressions - No issues I can see at all with Vignetting and if it is there it is not noticeable, at the wide end with the Zhongyi which is around 13mm after conversion and it seems fine. In terms of image quality I am finding it hard to see any noticeable difference between the image out of the Sigma through the dumb adapter or the Zhongyi which is great news to me. I shot some stuff in doors and saw comparable quality in terms of sharpness and resolution throughout. The zhongyi might be more prone to flaring when pointed at a light source but that is avoidable.. In terms of the IBIS and focal settings you have to input every time you turn the camera on. I think you pretty much have to stick to the focal length setting that relates to the focal length that you are going to use on the lens. So if you set it at 18mm, shoot at 18mm and you will get good stabilisation. if you set it at 18mm and then zoom in at 35 you get strange warping effects and issues. there is a delay from when panning to when the sensor \stabilisation recognises the pan and then catches up. if i set the focal length in cam to 35 and shoot at 35 again this looks great and stable, but if i then choose to go to 18mm i get the same issue, strange warping effects and delayed panning. The issue is the focal length setting in camera can only be changed when you are not recording. this means you cannot while filming both change your lens focal length and the in camera focal length setting. You basically have to choose what focal length you will be shooting at before you start recording and stick to it unless you want some adverse effects.... If you had to stick with one setting I would say you get better results going with the widest setting, so for the sigma you can set it to 18 and get great results at 18 and then the performance gets worse the more you zoom in. I think this option is better than setting the focal length to 35 which then only gives you great results at the far end, and then degradation the more and more you zoom out. all in all in terms of the Zhongyi...I would not hesitate to recommend it as a very cheap alternative to the speed booster.
  3. do not know what you mean? I am talking about the panasonic gh5
  4. Thanks...ideally though i dont want to have to go in and change this focal setting everytime i choose to zoom in or out?..is there not an optimal setting or range to suite any focal range on the lens?
  5. yes thats what I meant thanks for claryfying..can I ask what setting you put it in for the focal range when you turn the camera on seeing as its a zoom lens?
  6. lovely stuff!...one question...do you have to enter the focal length on the GH5 everytime you turn it on with the lens turbo on?
  7. great to hear!...can you show me some example videos?
  8. Lumix 12-35 F2.8 & Lumix 42.5 1.7 £550, both lenses in excellent condition, come with front and rear lens caps..paypal and uk only
  9. i suppose the question now is...do i want the tank that is the sigma 18-35 with adapter on my gh5 compared to my nice neat and small native lenses? Is the IQ of the Sigma and Low light opportunities that the lens turbo offers worth it?
  10. Thanks again for all your responses... If anyone has any test footage with this combo would be keen to see it.. especially how good\bad the zhongyi lens turbo is compared to the metabones
  11. Thanks!..if I can get a good enough price for the 12-35 f2.8 i will keep the 25mm and 42.5!
  12. Thanks for your replies! this guy tried the sigma 18-35 gh5 with speedbooster XL and still had no vignetting issues?
  13. this is what i have been told eslwhere "I think it is only the Lens turbo failing. The Sigma 18-35 is designed to cover a Nikon DX sensor with a diagonal of 28.4mm. 28.4*0.726=20.6 which is still larger than the GH5's 19.9mm with 16:9 crop. The actual image circle of the lens at 18mm seems to be around 33mm, so an ideal focal reducer would produce a circle of 24mm. I measured only 19.2mm through the lens turbo."
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