Bold Posted June 24, 2015 Share Posted June 24, 2015 I'm looking for a zoom lens for my GH4 with the following characteristics so I can mount it on my Century Optics 1.33:ParfocalFront assembly does not rotate (needs to hold the adapter level)As fast as possible (maybe in combo with speed booster)Covering the focal length the adapter will allowAs affordable as possibleThis would be for narrative filmmaking. I'm wondering there are any older/vintage zooms that might might fit the bill. They don't have to be perfect, but workable enough for me to get the practice & feel to see if I find it engaging enough to spend for some high quality glass down the road.I know there are Vivitar f/2.8's that are parfocal, but I don't know which (if any) have a front assembly that remains stationary while zooming/focusing. I also don't know what maximum focal length the DS-1609 adapter will allow. I found several topics in these forums which mention parfocal options, but 1) most are roughly $600+ which is out of my price range, and 2) even if I can save enough $ for one of those, it is not clear if any of them have a front assembly which remains stationary during zooming.Maybe there is no solution that will fit my budget, but I'm hoping there are some experienced Century+Zoom owners out there that can help. Thanks! Quote Link to comment Share on other sites More sharing options...
John Palmer Posted June 28, 2015 Share Posted June 28, 2015 olympus OM 35-70 f3.6 is supposed to be good. the front element does not rotate either. I haven't gotten around to buying one, so haven't actually tried it thoughYou can get one is nice condition for less than $100 Julian and Bold 2 Quote Link to comment Share on other sites More sharing options...
dhessel Posted July 8, 2015 Share Posted July 8, 2015 lomo foton 37-140mm is exactly what you are wanting and even has an interchangeable mount. In fact it is designed to work with a anamorphic front as well. It is designed for s35 so not sure if it will cover the sensor. However with all lenses on a still camera there is the issue that you cannot adjust back focus. For a lens to be parfocal its flange focal distance must be correct which could be a problem. The foton does have a back focus adjustment as I recall. I loved my foton before its aperture failed, they go for $600-$800. Tito Ferradans and Bold 2 Quote Link to comment Share on other sites More sharing options...
Bold Posted July 8, 2015 Author Share Posted July 8, 2015 Thanks John & dhessel. I will probably stick with a cheap, short-term zoom option for now. The Foton sure is pretty though Quote Link to comment Share on other sites More sharing options...
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