Got the Tagotech EURO AF Confirm chip today and want to get it mounted on the Rokinon 85. Before I screw it up figured I'd ask a couple question from folks who have done this before.
1. Did you use the plastic support adapters? And if so how?
I mounted the chip on a few Leica_R to Eos adapters. There was a bit of trial and error. Going by the instructions, (and their jig) my alignment wasn't correct. So I figured out distance I was in error by, poped it off, and started again. I used the little extra plastic piece that goes on the inside radius, but It wouldn't be the same for all adapters. Really not an easy task. I will say that my 2n'd and third tries came out better than some of the adapters I got from fotodiox.
The programming was quite an exercise also, Kind of like typing a sentence with a keyboard having 4 buttons.
Look at a native lens to understand the relation of the chip to the lens. The plastic jig gets you really close. You can use two way tape - the paper thin variety and tack it in place - leave the tape short of the chip length at both ends - cut it in with a new sharp razor - you can slightly move it around a bit - be careful not to break the chip. Set the chip with superglue, hotmelt or an epoxy (use a toothpick or other tool) in the area under the chip absent of tape.
Every adapter is different and I haven't seen the Rokinon mount - hope this works for you.
I asked the Tagotech folks and they recommend superglue, which is what I've been trying to use.
I have yet to be able to get this to make a consistent connection when the lens is fully locked in place. I have it pretty close but as soon as the lens locks in place the connection is for some reason lost. If I unlock the lens and rotate it as little as possible the connection will kick back on, move it a little further and its off again. I've repositioned the thing about 20 times and just can't get it right.
So not sure if I'm doing something wrong or its just really really really finicky.
I ended up using a single layer of plastic from a credit card to try to lift the chip up a bit, which seemed to help but still no way to get a consistent connection when locked.
Oh and I didn't use the shims that came with it since I couldn't figure out any point to them on this lens.
HopeIsEternal wrote:
Wouldn't the World be a better place if Samyang put the fifty cents chips on their lenses to begin with? :-(
Not if it would give the same result as Paul's chip. I've chipped some of my adapters over 2 years ago and never had a faulty connection with them... I used some regular glue to get the chip in the right place, and then expoy to secure it permanently.
I believe the chip itself is fine, its my mounting that's causing issues. Though I suppose it could be a bad chip. I'm assuming if Samyang would actually put such chips in the camera they'd be mounted correctly.
Shims shouldn't be needed on that lens but they provide support on adapters that have thin lips. I never put one on the Rokinon I had but have done it on a lot of others. It is finicky and takes some experimenting, especially since you can't just mount an adapter on the camera with the chip by itself to see how it's lining up. On another lens, look at the relationship of the connectors to the closest lug on the mount bayonet as a way to judge where to put the chip. Typically the edge of the third contact from the left closest to the fourth contact is right at the edge of the bayonet lug. This isn't exactly the same from manufacturer to manufacturer but should be very close. Since you mentioned that you lost the connection when you locked the lens in place, my guess is that you have a slight side to side misalignment. That seems to be the hardest part to line up and I almost tossed a chip once because I thought it was bad like that but turned out I just didn't have it in the exact right place. To alleviate your doubts about the chip itself, hold the bare chip against the pins with correct alignment (may have to press down some) and see if you see the aperture info. If you do, it's an alignment issue for sure. If you don't, make sure you have the contacts clean since it's easy to get adhesive on them while you're doing all that handling.
p.1 #10 · Tago Tech AF confirm chip and rokinon 85
I mounted the adapter alone on the camera, marked on the adapter where the camera contacts are, placed the chip so that the chip contacts lined on the mark, and glued it with crazy glue.
Programming the chip is a royal pain in the neck. It took many many tries before I can put the chip in programmable mode. I successfully programmed the first chip but I could not program the next two chips.
p.1 #11 · Tago Tech AF confirm chip and rokinon 85
Very useful information in this thread. I don't know if I want to take this challenge on and give this chip a try or not.
A question for anyone that is using one; once you have the chip set up, can you change the aperture value in camera when in AV mode by turning the thumb wheel the same way you would with a regular lens? Or do you have to go into programming mode to change the value? I know you still have to twist the aperture control ring to actually change it, but it would be nice if you could change the in camera value as well so that exif data is accurate.
p.1 #12 · Tago Tech AF confirm chip and rokinon 85
Mark Zwiesler wrote:
A question for anyone that is using one; once you have the chip set up, can you change the aperture value in camera when in AV mode by turning the thumb wheel the same way you would with a regular lens? Or do you have to go into programming mode to change the value? I know you still have to twist the aperture control ring to actually change it, but it would be nice if you could change the in camera value as well so that exif data is accurate.
I don't believe this works on the tagotech chip and yeah I'd agree that it'd be very useful. Maybe there's some way to enable it with the programming but I couldn't find it.
p.1 #13 · Tago Tech AF confirm chip and rokinon 85
@Mark Zwiesler: I asked the same question before in a different thread about these chips and it doesn't work like that. There are no chips that work like that, afaik.
p.1 #14 · Tago Tech AF confirm chip and rokinon 85
Mark Zwiesler wrote:
Very useful information in this thread. I don't know if I want to take this challenge on and give this chip a try or not.
A question for anyone that is using one; once you have the chip set up, can you change the aperture value in camera when in AV mode by turning the thumb wheel the same way you would with a regular lens? Or do you have to go into programming mode to change the value? I know you still have to twist the aperture control ring to actually change it, but it would be nice if you could change the in camera value as well so that exif data is accurate.
You can only affix a value to each lens. This value will not change when you
1) change the aperture on the lens manually
2) rotate the aperture wheel in Av mode.
To me, this serves to identify each lens in peripheral illumination adjustments. There are no other uses for fixing an aperture value to the lens that I can think of at this point.
p.1 #15 · Tago Tech AF confirm chip and rokinon 85
I finally succeeded a few minutes back. I've put the lens on and taken it off a bunch of times and it seems to recognize the chip every time. The final fix involved me doing some light sanding of the contacts, I had tried this before but must've gotten more glue on it.
So I think the way to mount this chip is using a single layer of credit card material to lift it a little bit and obviously make sure that the contacts are clear of any superglue. I checked the guide they included with the chip in its working position and it seems exactly correct. So its possible that I wasted a ton of time because the contacts weren't clean, oops.
On the positive side of things Av mode seems to work fairly well. The aperture can't be changed on the camera, but when you change it on the lens the shutter speed seems to change appropriately. I think this makes sense since the camera has to measure the light level via the lens anyways and if you physically change the aperture on the lens the camera sees that there is less light available and adjusts the shutter speed.
p.1 #16 · Tago Tech AF confirm chip and rokinon 85
paulpthcom wrote:
I finally succeeded a few minutes back. I've put the lens on and taken it off a bunch of times and it seems to recognize the chip every time. The final fix involved me doing some light sanding of the contacts, I had tried this before but must've gotten more glue on it.
I use epoxy which does not require a whole lot to keep the chip in place. IMO, it is also more firm when hardened. I find superglue to be a bit more messy and hard to mold nicely.
p.1 #17 · Tago Tech AF confirm chip and rokinon 85
Super glue is good for getting it set well enough to check if you have it located correctly. If you don't, it's easy to pop off. Epoxy, on the other hand, is a bitch to get off if you miss. You use the epoxy after you know it's in the right spot.
p.1 #18 · Tago Tech AF confirm chip and rokinon 85
I'm just going to keep it on with superglue, don't see the point in trying to move it again now that its in place. It is messy , but mostly because I put it on and took it off so many times while trying to position it right.
Pretty sure if I had just started by using a Credit Card as backing with the guide and cleaning off the contacts I would've gotten it right the first time.
p.1 #19 · Tago Tech AF confirm chip and rokinon 85
I use 5 minute epoxy on the Tagotech chips. The older disc template they used to ship works better for me than the current "arm" template. If you catch the epoxy at the right time, micro movement is possible if the contacts don't line up.
I've also had great success micro-tuning the front/back focus adjustments of the chip.
p.1 #20 · Tago Tech AF confirm chip and rokinon 85
Did you need to do micro tuning to get accurate focusing? Or you decided to do this to get even better focus? I mean, did your chip work okay in the default setting? (9 of 1-17 in command F8)
I cannot get a good focus confirmation with the Tago chip. In the AF mode (command F9), the green dot seems to be lit for a wide range of depth. This range is inconsistent depending on where you focus from. From front focus to the actual focal plane or from infinity to the actual focal plane. Often, the green dot is lit from infinity to 1m, or vice versa. I gave up on the AF mode.
Also, I don's see how AF mode focusing (green dot) is more accurate than focusing (green dot) in the MF mode as the manufacture vaguely claims in the manual...
In the MF mode, the green dot comes on and off as Canon's lens in MF mode. Meaning, the green dot only come on for a very small angular displacement of the focusing ring when things appear to be in focus. But the green dot from Tago chip is not accurate at all. The pictures that I get are not in focus at all. Also, 10x or 5x live view magnification does not work in MF mode. I thought that it should as the Canon lenses. As soon as I turn the focus ring on the lens, the camera gets out of the magnification mode. Very annoying.
I also noticed that sometimes the green illumination (all of the display) in the viewfinder suddenly blink so brightly (burst of green illumination).
