#Adaptor canon contax 645 manual
#Adaptor canon contax 645 full
#Adaptor canon contax 645 plus
#Adaptor canon contax 645 series

#Adaptor canon contax 645 series

The Canon 5D series has a larger than normal EOS mirror, so take extra care mounting lenses.

Take note that if you do this modification, the adapter may or may not lock on other Contax lenses. These lenses may require about 1mm to be filed from the end of the brass locking latch, before the lenses will lock on the adapter. Lens mount variations have been reported on the 28/2.8 MM and the 35-70 MM lenses. There have been conflicting OK/Not OK reports on the Contax 28/2.8, perhaps suggesting unreported lens variations. LENSES WHICH WILL NOT WORK: Reportedly the following adapted Contax lenses are not compatible with the EOS 5D: 18/4, 85/1.2, and 135/2. Prices started going up on the harder to find lenses, especially the ultra wides, in big part because EOS shooters became dissatisfied with Canon ultra wide lens performance.

However don't take my word on this, just email the good folks at to get it from the horse's mouth.Д¬ontax/Yashica lenses were discontinued January 2005 once Kyocera and Zeiss dissolved their partnership and discontinued the entire Contax lineup. I don't believe ANY lens maker, especially Zeiss, would design lenses within the same lens line with a different back focus, beyond their normal manufacturing tolerances. While I admit I have no proof to the contrary, I have to say personally I find such a claim impossible to believe. There has been some internet discussion claiming it is best to use different thickness Contax/EOS adapters for different Contax/Yashica lenses. When pushed, you can remove the adapter from the lens. You can see the locking latch on the back of the adapter pictured above. To remove, remove the lens/adapter together. Mount the lens onto the adapter, then mount the lens with adapter on the EOS body. These adapters are NOT for Zeiss N series lenses, or G series.

#Adaptor canon contax 645 manual

The EOS digital bodies are a great digital option for your manual focus Zeiss Contax/Yashica lenses. Not only do you not have to worry about losing the screw, this adapter is much faster to mount than adapters requiring a set screw. Unlike some Contax / Yashica to EOS adapters, the CameraQuest adapter does NOT require a set screw.

#Adaptor canon contax 645 full

Thus, if you want to capture a full image circle without being cropped by the 645's frame size, you need to use a Canon EF-S lens, or any lens designed for a Canon APS-C sensor (or smaller, such as Micro-4/3).Contax/Yashica Lenses: CEOS, mounts manual focus Zeiss Contax RTS lenses on EOS. This is less than the 645's smallest dimension, and again, is a worst-case size (with regards to exit pupil distance). Now, if you used an EF-S lens that projects a 'tight' image circle for Canon's APS-C sensors (1.6x crop factor), then a 0mm exit pupil lens would project (43.3 / 1.6) * 70.87 / 44 = 43.6mm. For a hypothetical 0mm exit pupil distance, the extended image circle would be 43.3mm * 70.87 / 44 = 69.7mm. The calculation is worse the smaller the exit pupil distance is. Then the light cone of your Canon EF lens mounted on the Pentax 645 would spread out to a diameter of 43.3mm * (70.87 + 25)/(44 + 25) = 60.2mm, which is just past the width of the 645's film/sensor plane. But just for the sake of example, let's use 25mm. I don't know what the exit pupil distance of your lens is. So the lens is mounted an extra L millimeters further from the sensor than normal, its light cone will spread out to a size of 43.3mm Г— (FFD Pentax + P)/(FFD CanonEF + P).

#Adaptor canon contax 645 plus

You can think of the light cone of the EF lens as a cone with a base diameter (minimum) of the EF sensor (43.3mm), and with a height of the FFD plus the lens's exit pupil distance (from the lens flange). Assuming your EF-to-645 mount adapter is a zero-depth adapter (which is actually quite possible, considering the substantially larger diameter of the Pentax 645 mount), then the light cone of the EF lens will project an additional 26.87mm. However, the flange focal distance (FFD) of the Pentax is 70.87mm.

So there's not a lot of room for error there. The height of the Pentax's film/sensor plane is 45mm, just 1.67mm wider than the EF's minimum image circle. The image circle of the EF lens must cover this distance (plus probably a little bit extra). Specifically, the 24mm Г— 36mm sensor has a diagonal of 43.3mm. The EF lens projects an image circle with a diameter that is at least as large as the diagonal dimension of the EF body's sensor. This doesn't answer your question regarding adapter, but I wanted to caution you that you probably won't capture the entire image circle: it will be cropped a bit on the top and bottom edges of the Pentax's frame.