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John,had a quick moment to take a shot:
in M mode, set s speed at 1/250, camera shows f5.6, but underexposed 2 stops according to vewfinder metering if lens is at 5.6. so left camera at 5.6, but set lens at 2.8: perfect exposure with camera meter and the final shot. exif data show 1/250 and f5.6 (the camera setting)
Carl, You told me to do it this way and it is working perfectly no matter if I am in M or A mode.John,
My understanding is that you must set the camera to the widest f value available (f/2.8 for the 90mm) and leave it there. Then you select the aperture you want for your exposure and set that with the lens aperture ring. The camera will always record the max aperture in exif and not the actual exposure aperture set on the lens.
John, I don't have to "open lens to f2.8 and auto focus with light shutter press (2.8 gives most accurate focus), then manually stop down the lens to the desired aperture". I put my 90mm on the A7rII with the latest Techart updated adapter. I set the camera to aperture f/2.8 and forget about it. From there I set my aperture on the lens to my setting. After that it operates as I would any other lens in M or A and depending on if I have ISO set to AUTO or a setting.to further clairify, since we are so spoiled by auto-everything:
i use A priority and would expect the shutter to be auot set according the the light reaching the sensor...
so open lens to f2.8 and auto focus with light shutter press (2.8 gives most accurate focus), then manually stop down the lens to the desired aperture, camera sets the shutter speed according to the camera f-stop, so you have to match the lens setting and make the shot.
any f-stop set in the camera is controlling the shutter speed in A, so you have to set both on the lens and in the camera
if i were using the old Metabones manual adapter: in A mode
set f-stop on lens, camera sets shutter speed according to the camera f-stop so that has to match the lens, manually focus, make the shot.
still getting used to this
One thing that might solve the mounting issue is that Contax G lenses were never to be removed from the body like normal lenses. Do not hold the black area and twist. You need to have your hand on the ribbed band behind the aperture ring. When you release the lens, it will be locked into position to mount the next time.still trying to figure out how to mount the lens to the adapter...grrr!
also:
the manual focus wheel on the adapter is freewheeling completely; doesn't seem mechanically connected to anything?
the little drive tab on the adapter is stuck pointing vertically (in rotation); can't see how it would engage the drive fork on the lens, and seems to be preventing the lens from rotating fully into position.
(on my metabones G-Nex manual focus adapter, rotating the focus ring will rotate the little drive tab on the adapter)
It is a terrible manual. I'm hoping that we can post enough info in this thread that we can get everyone here up and running.I would think Carl's explanation pretty much is how I would expect it to work. Set camera aperture to widest setting and use the lens to set aperture.
What bothers me is this company sells internationally but fails to supply easily understood instructions in the countries language their customers are located in. Using the adapter or updating firmware should not be a game of Russian Roulette with 3 rounds in the cylinder which gives the customer only a 50-50 chance of success. Just how much would it cost them to have a usable translation of their owners manual. They are not stupid obviously about the technology involved in their product but I see not having English, French, Spanish, German translations in their owners manual is a major issue. One should not have to guess and hope while doing a chicken dance to get a product to work as described. That is business 101
Jim, Since you already have the lens, you might want to consider that for only a $300 investment, you could give it a try. You will have our support, and you can always return the adapter to B+H, if it does not work out.Cindy there is a bunch of good information on this thread... What worried me is Anna's situation with the 90mm.... It is the only CG lens I might of kept in digital service if the DeoTech adapter could give good AF performance on that lens.
Of course, Jim. You need to do what is right for you. I am happy with mine. I want to use this fine lens with AF. Everyone has the right to decide for themselves.Cindy, I truly appreciate the offer of assistance with this product... I truly do! But, we have a regular here right now who is afraid to swap from a 45 to a 90mm lens on her adapter in fear she will once again lose what she finally achieved with the adapter and her 45mm. I don't see others helping resolve this issue for Anna so the product can be used as described.
Cindy, read the reviews on this product on Amazon. Granted bad news travels faster than good but a adapter falling apart while in use???? And the only positive was no parts fell inside the camera? Really? In 2015 a manufacturer dealing in a monopoly on a world market can get away with some transgressions just not as many or to the degree we see on this thread or the Amazon reviews and expect a flock of new informed customers. This thread and the Amazon reviews showed me it is much wiser to spend $1000 on a great OEM 90mm lens than $300 on a POS adapter from a company who isn't even willing to create a usable users manual in the language of the countries they want to sell to. Techart or DeoTech or what ever name they want to call themselves tomorrow can keep their product and I will spend my money on products that review 90%+ at 4 stars or more and offer USA based warranties that one doesn't have to be bilingual to understand how to use.
You are sounding more angry than me ! The problems are probably not only due to the adapter, but to the fact that those lenses can be a little tricky to operate. Everything depends upon that little screw and depending on its state it will work better or not.Cindy, I truly appreciate the offer of assistance with this product... I truly do! But, we have a regular here right now who is afraid to swap from a 45 to a 90mm lens on her adapter in fear she will once again lose what she finally achieved with the adapter and her 45mm. I don't see others helping resolve this issue for Anna so the product can be used as described.
Cindy, read the reviews on this product on Amazon. Granted bad news travels faster than good but a adapter falling apart while in use???? And the only positive was no parts fell inside the camera? Really? In 2015 a manufacturer dealing in a monopoly on a world market can get away with some transgressions just not as many or to the degree we see on this thread or the Amazon reviews and expect a flock of new informed customers. This thread and the Amazon reviews showed me it is much wiser to spend $1000 on a great OEM 90mm lens than $300 on a POS adapter from a company who isn't even willing to create a usable users manual in the language of the countries they want to sell to. Techart or DeoTech or what ever name they want to call themselves tomorrow can keep their product and I will spend my money on products that review 90%+ at 4 stars or more and offer USA based warranties that one doesn't have to be bilingual to understand how to use.