Fred Miranda wrote:
I got the Contax 28/2.8 G and Fotodiox adapter today. Unfortunately I can't reach infinity with this adapter when using the 1.5m front-lens.
There are not many adapters options. I think the Pixco brand is not longer available.
Sorry to hear that, Fred.
My pixco adapter was purchased 6 years ago and it seems those cheap adapters have copy-to-copy variations so I can't recommend you to buy any more adapter for getting infinity.
Did you try removing shims inside the G28? I've just tried to unscrew its front name plate. Mine was easy to rotate by hand when I put rubber glove on. Once removed name plate, you can separate the optical module and shims by just removing 4 screws under the name plate (I didn't try it because not necessary for me).
Fred Miranda wrote:
I got the Contax 28/2.8 G and Fotodiox adapter today. Unfortunately I can't reach infinity with this adapter when using the 1.5m front-lens.
There are not many adapter options. I think the Pixco brand is not longer available.
how far out does it focus? there is a single brass shim under where the optical block is mounted that can be removed, but it's not terribly thick. i explain how to remove it here.
sebboh wrote:
how far out does it focus? there is a single brass shim under where the optical block is mounted that can be removed, but it's not terribly thick. i explain how to remove it here.
I should just move the optical assembly to a rokkor MC 55mm f/1.7 and be done with it.
Getting a good adapter for this lens is harder than I thought. I think the Fotodiox adapter is too thick. It barely reaches infinity even without the 1.5m front-lens.
Fred Miranda wrote:
I should just move the optical assembly to a rokkor MC 55mm f/1.7 and be done with it.
Getting a good adapter for this lens is harder than I thought. I think the Fotodiox adapter is too thick. It barely reaches infinity even without the 1.5m front-lens.
With a nameless cheap adapter I was able to focus well past infinity with a Biogon-G 28 and a 1m. filter and so did HaruhikoT. It really surprises me that Fred can't reach infinity with a weaker filter. That Fotodiox adapter must be out of specifications..Without a filter you should be able to focus past infinity by a fair margin because Contax G lenses don't have a hard stop at the infinity mark.
I am trying two other adapters. Kipon and Pixco.
($145 and $28 respectively)
Should have the Kipon in a couple days. If it does not work, I will try removing that shim.
I don't think it's a lens issue. I bought one brand new never used in box.
artur5 wrote:
With a nameless cheap adapter I was able to focus well past infinity with a Biogon-G 28 and a 1m. filter and so did HaruhikoT. It really surprises me that Fred can't reach infinity with a weaker filter. That Fotodiox adapter must be out of specifications..Without a filter you should be able to focus past infinity by a fair margin because Contax G lenses don't have a hard stop at the infinity mark.
Fred Miranda wrote:
I am trying two other adapters. Kipon and Pixco.
($145 and $28 respectively)
Should have the Kipon in a couple days. If it does not work, I will try removing that shim.
I don't think it's a lens issue. I bought one brand new never used in box.
All Pixco adapters I have ever used have been the worst.
Nikon-G -> Leica-M even had a light leak...
So my money for a too short adapter is on the Pixco :-)
Well, the Leica ELPRO4 doesn't do anything on the Contax G 28mm. I had hoped that'd be a nice cheap solution.
On the other hand, the ELPRO4 makes an awesome compact closeup lens for the Contax G 90mm that changes the mfd from 1 meter to .4 meters. What's more, the 57mm Contax push on cap (used for the lens hood) is a perfect fit over it, too!
So, I call this one a wash. And now I'm putting in an order for the 1.5m PCX.
BastianK wrote:
All Pixco adapters I have ever used have been the worst.
Nikon-G -> Leica-M even had a light leak...
So my mones for a too short adapter is on the Pixco :-)
+1
the fotodiox is probably purposely thick to give best mfd.
I'm using a Sony A7R2 with Zeiss ZM 25mm. Acquired a black Hasselblad Proxar 1M, and using Dremel removed casing and put into Amazon UV filter as described by others. Glass of filter is higher than wall of UV filter BTW, but not a big deal.
I took apart the Biogon 25 both ways. The smaller lens removal exposed 1 brass ring, which I removed. Indeed, focus was changed but I still am far from infinity. Infinity is probably about 2-3 meters away maximum.
Any ideas on how to get to real infinity now? Or is my lens a little different?
There are 4 shims in front gold, silver , gold and brass. I tried all out and with the brass in . No go, I can't seem to get infinity. the ring you mentioned was the rear element ring.Not sure if we take that off or not. I have a Hawks adapter and have it set to the furtherest point for infinity
Yea Fred that's what I'm thinking . I took 4 off the front and I'll take the rear element ring as well. It's really close. Rear element is a little tight so I just stopped for now. I'll try again the morning
I went back and removed the lens barrel to expose the inner shim rings, that are also secured by a screw - as I now remember seeing someone else mention.
I took some images that may help others see how easy it is and identify the rings.
This was done by removing the outer ring. I will likely return the rear brass shim as my focus now exceeds infinity using the VME adapter.
This setup utilized the Proxar 1M removed from original casing and remounted as noted above by many using step up adapter filter rings.
Good news i actually went past infinity. So to recap there are 4 shims in the front of the lens which slide off BTW. Than the rear element shims there are 2. So a total of 6 shims. Just now i removed the two rear and left one brass shim in the front. Past infinity. Im going to try and put one rear shim back
