Patrick Donnelly

Joined on Aug 13, 2019

Patrick Donnelly's recent activity

  • MV c mount lenses have been produced for decades in 4/3 inch sensor coverage. China is now producing them. I got a 12mm F2 from an Austalian source. Impressive and large. Needed to be shaved to ...
  • Replied in ...
    Movie will normally use a slightly smaller area of the sensor, even if using the whole of frame, meaning no vignette, hard of even soft depending on the lens. Scouring Vimeo or YT to verify will help!
  • I agree, but would go further. APS cover is possible at the widest apertures with some 50mm and 75mm TV lenses, made for 1 inch sensor. For portrait stills, the drop off in acuity and non ...
  • It looks like the rear section may be demountable? It may take 0.9mm allen keys. If the impass with the supplier continues, this may be necessary. Fujinon tv lenses of an older vintage reveal a t ...
  • Perhaps fitting the lens to an altered adapter will work? On the principle of least damage. Opening the c mount hole could allow the lens into the camera and achieve infinity. The hole should jam ...
  • Zooms usually will not cover much more that 1 inch sensor, some will cover 4/3 sensor over some of their range.

    Primes can cover FF if long enough. 50mm will generally cover APS, especially if fast.

  • Zeiss don't make mistakes even though this was made for them, by Tokina. I am a great fan of machine vision lenses. They have set screws to set focus and aperture, allowing substitution by stand ...
  • Did you free lens without the silver c mount of the lens? If you did, then you may be looking at removing whatever metal you can from the lens and then glueing or screwing an adapter to it. I am ...
  • Obviously ripped from a camera. 12mm for this age of zoom is at best, a 2/3 inch sensor. Then there is an issue connecting it... It may need grinding down to allow an adapter to be connected. Given ...
  • Asking prices on eBay are notoriously unreliable and optimistic. The early cine C mounts of 50mm and longer, but not too long the 150mms are clearly neglected, are now being re engineered, or ...
  • The pretence that resolution of the valves used in old TV cameras influenced the quality of the glass in the lenses is laughable. We got the Canon (and Fuji?) fast fifties, beyond F1.2, made for ...
  • Fujian, a Chinese 'Province', actually a subordinated country, is the origin of the 24mm and 35mm and 50mm, 1st gen lenses. They have been rebadged 6 or 7 times. They are nominally 1/2 inch sesnor ...
  • "To adapt any lens like that to MFT, step one is to remove the C mount adapter." Do you mean "C mount" rather than an adapter?
  • Great find of pic. But that raises another issue: the amount of protrusion into the body of the camera.... It seems it will be close to any mechanical shutter, some cameras no longer have one, even ...
  • There are groups that specialize in c mount lenses. Fb has one at least. We'd love to see you there.
  • I have a fair few c mount lenses. What is erroneous in my post, exactly?
  • There are many c mounts designed for 1 inch sensor. All the first consumer tv lenses were 1". Then came the smaller valves that allowed 2/3 inch lenses. Then came semiconductor sensors. I suggest ...
  • The base width is only an issue if the distance between the base and the adapter is short. The c mount must protrude proud of the base by a certain amount, to allow the full screw of the adapter ...
  • Are you finding that the adapter only just screws on and that the lens will not give you infinity? The most accomodating adapter has the rim around the edge, probably necessary to maintain ...
  • These seem to be more common in the USA. The lenses tend to be very fast and cover large image circles.
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