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Concerning the lenses : they were designed for film as you know and the wide angle design (Biogon) doesn't cope well with the short flange distance of the E mount, nor with the high resolution of the sensors : the problems come from the angle of light striking the sensor too steeply. This results in smeared corners and depending on the model, magenta cast. On the A7r the 28mm was a very bad performer. I didn't even test with the A7r2. In order to mount the 21mm you need to cut the black plastic wings protecting the rear elements. The lens is fabulous with film, but produces smeared corners on digital bodies from what I have seen, so I didn't even care to cut those rear wings.Happy to report i've received an "used" TA-GA3 from eBay and successfully updated the firmware to the latest 2.2.0 (I noticed 2.1.0 crashed the app, must've deleted it from their server)
With my G 45/2 it works wonderfully, I actually took this lens apart to clean it and overhaul it, learned a thing or two through trial and error.. tested it with a mint 9mil. serial 45/2 and it worked beautifully. I have got my G 45/2 to work the same way now and it is FANTASTIC. It is what I wanted in V1 of the adapter a year ago. Albeit aided with phase detection its rapid in good light, and ok in low-light though that can use improvement.
I'm now looking for examples of the 21 and 28 Biogon photos from the A7RII if anyone has any, strongly considering picking one up just because of the value there.. and i'm using a G1/G2 film setup too. Also ordered a G 90/2.8 for $150 yesterday i'm pretty ecstatic at the usability here.
Given some time i'll be writing up a summary of important things I think newcomers will find useful; i.e. firmware upgrade procedure, focus tuning, and other tidbits I found out the hard way..
Hi Lamlux,Happy to report i've received an "used" TA-GA3 from eBay and successfully updated the firmware to the latest 2.2.0 (I noticed 2.1.0 crashed the app, must've deleted it from their server)
With my G 45/2 it works wonderfully, I actually took this lens apart to clean it and overhaul it, learned a thing or two through trial and error.. tested it with a mint 9mil. serial 45/2 and it worked beautifully. I have got my G 45/2 to work the same way now and it is FANTASTIC. It is what I wanted in V1 of the adapter a year ago. Albeit aided with phase detection its rapid in good light, and ok in low-light though that can use improvement.
I'm now looking for examples of the 21 and 28 Biogon photos from the A7RII if anyone has any, strongly considering picking one up just because of the value there.. and i'm using a G1/G2 film setup too. Also ordered a G 90/2.8 for $150 yesterday i'm pretty ecstatic at the usability here.
Given some time i'll be writing up a summary of important things I think newcomers will find useful; i.e. firmware upgrade procedure, focus tuning, and other tidbits I found out the hard way..
Not sure how off-topic I can pull this here but i'll mention it for sake of the future searches..Hi Lamlux,
You might be my saviour! Recently I just discovered my 45/2 developed some fungus inside the front element. However I'm completely perplexed to how to take this lens apart. I have taken many lenses apart before (and destroyed a few in the mean time), however I just dont know where to start with this one.
Do you mind giving me some pointers? Or if possible, some guidance photo. I would be very grateful.
Many thanks
The A7s and A7sII have the same AF as the A7r : they use only contrast detect (unlike the A7II and A7rII which are hybrid and use both contrast detect and on sensor phase detect). This means that the A7s and A7r can focus with the Techart adapters, but they are slow. That is OK for landscapes and immobile subjects, but not for moving subject unless you can prefocus. At least that is my experience with the A7r. I don't have an A7s, but I don't think it will be better in normal daylight, given that they share the same AF system. With the A7s you may have some advantage in low light maybe.Hopefully I'm not beating a dead horse here. I just would like to know how slow/fast/accurate is autofocus with the Techart Contax G adapter/A7S combination. The Contax G lens I'm mainly interested in is the 90/2.8.
I have an Oly 100/2.0 already, but it would be nice to have an autofocus tele lens also. Of course there are native options available: Sony 90/2.8 macro (wich is stellar but quite bulky) and Zeiss 85/1.8 (smaller but more expensive and hard to find). Contax G 90/2.8 is compact and would be much cheaper even with the adapter.
So, if anyone has experience of the combination mentioned above, could you please share your experience?
Thanks in advance!
Best regards, Jyrki
Hopefully I'm not beating a dead horse here. I just would like to know how slow/fast/accurate is autofocus with the Techart Contax G adapter/A7S combination. The Contax G lens I'm mainly interested in is the 90/2.8.
I have an Oly 100/2.0 already, but it would be nice to have an autofocus tele lens also. Of course there are native options available: Sony 90/2.8 macro (wich is stellar but quite bulky) and Zeiss 85/1.8 (smaller but more expensive and hard to find). Contax G 90/2.8 is compact and would be much cheaper even with the adapter.
So, if anyone has experience of the combination mentioned above, could you please share your experience?
Thanks in advance!
Best regards, Jyrki
@Lamlux: Thank you, I will give it another try today and if there's any problem I will PM to keep the thread clean.
@Slingers: Hi, a forum member said you successfully use a G35-70 with Techart AF adapter. Could I pls ask which version of the adapter it is? And how do you feel about its performance?
Thank you. By working, do you mean autofocus works well also? Is there any magenta cast in the corner at all?I have used the zoom with both the version I and II of this adapter as the first version adapter I had so many problems with it I had to send it back. The zoom worked great for me on both adapters but in the exif it reports its the G21. Actually the G21 and G35-70 never have had any problems for me with the adapters only the G45, G90, and occasional problems when using the G28. I see though a lot of reports of the zoom not working so maybe I am lucky with mine but it is a black coloured version and maybe it's different. I find the zoom lacks a little contrast but is nice small package with decent sharpness for these cameras.
Thank you. By working, do you mean autofocus works well also? Is there any magenta cast in the corner at all?