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An Opteka 85mm F1.4 Review

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kozmo View Drop Down
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Post Options Post Options   Quote kozmo Quote  Post ReplyReply Direct Link To This Post Posted: 21 June 2010 at 17:34
You should make these and sell them. Any left? It so how much?
A850 vg, A57 A33. Zeiss 135 1.8, Tamron 200-400 17-50 2.8
Minolta 100 f2, 50 1.7, 85 1.4 RS, , 35-105, sony 30 macro, tokina 19-35, Beercan.


 



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groovyone View Drop Down
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Post Options Post Options   Quote groovyone Quote  Post ReplyReply Direct Link To This Post Posted: 21 June 2010 at 17:41
Originally posted by ricardovaste ricardovaste wrote:

I was approached a few weeks ago by someone in the UK about adding a chip to his 85mm Samyang lens. I finally got to work on it today... took a while, but hadn't done one before so took my time. We decided that it was best to replace the entire mount with a chipped one - it is more 'aesthetic' this way and it may also be helpful if the lens decides to become faulty at any point in the future and requires a repair under warranty (he would just put the old mount back on... this may not work in reality, but it was still the best way of doing things in my mind).


edit: Just to be clear, I did not buy this, I machined the parts myself.


Great work. Very clean install.
A99|A900|A100IR|A7|Maxxum 7|Maxxum 5|Polaroid
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ricardovaste View Drop Down
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Post Options Post Options   Quote ricardovaste Quote  Post ReplyReply Direct Link To This Post Posted: 21 June 2010 at 20:55
Thanks Keith!

kozmo - you get send me a PM if you'd like one at some point. Problem at the moment is I don't actually have an 85/1.4 to test such a thing on, so it will require a little work yet.
I photograph the moments in people's lives that mean the most to them: Richard Harris Photography
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Grodan74 View Drop Down
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Post Options Post Options   Quote Grodan74 Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2010 at 00:30
Amazing lens! Just got mine chipped today, after some while with the "wrong" chip in my possession (which would be the m42 version from james lao). But I got it installed after some rasping (or whatever you call it).

However if I would have bought the "fat" chip from james lao it would have fitted without any modification except for the epoxy-glue, so this is what I would recommend, if you are smooth in your handling with the glue you will have it done in a few minutes.


The focus confirm I find not very useful as I still focus with my eye. (I will soon order a focusing screen). The A-mode is quite useful, it is nice to not turn the wheel like a maniac all the time.

But the real kicker is the f1.4 and SSS combination! It's f-ing fabulous!


//Albin



Edited by Grodan74 - 23 June 2010 at 00:30
α300 | Samyang 85/1.4 | Sony 50/1.8 | Kit-lens | Minolta 70-210 f4.5-5.6 | Minolta 28-85 f3.5-4.5 | F42 |
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Post Options Post Options   Quote skm.sa100 Quote  Post ReplyReply Direct Link To This Post Posted: 24 June 2010 at 14:43
Albin, can you give a link to exactly which chip you used? And a picture of the chipped lens? It sounds tempting to be able to just get a chip and glue it on.
Also, why is it that the focus confirmation isn't useful? Is there a large "zoom range" through which the focus confirmation stays on? I've read about that somewhere in the past.
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Grodan74 View Drop Down
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Post Options Post Options   Quote Grodan74 Quote  Post ReplyReply Direct Link To This Post Posted: 24 June 2010 at 18:57
Yes, no problem.

I ordered the M42-a/MAF chip from http://eadpt.cn/eadpen.htm. I Think that the MD-a/MAF chip would have been easier to install. However if you are unsure if it will fit, the modification of the mount to fit the M42 chip wasn't that hard, took maybe 20 minutes of rasping.


Here are a few pics:

The mount just prior to gluing, with the chip next to it


The mount with the chip (not glued). It would be nice if it had looked liked this after the gluing


But instead it looked like this (a lot harder to handle than i thought)


After some processing


The final result (very not pretty but i works)




Maybe I was a little harsch regarding the focus confirm. Ofcourse it can be useful, but it can be pretty hard to notice (maybe its the small VF of my a300), and its hard to look at the focusconfirm-LED and still point the focus-point at the right direction.


//Albin


α300 | Samyang 85/1.4 | Sony 50/1.8 | Kit-lens | Minolta 70-210 f4.5-5.6 | Minolta 28-85 f3.5-4.5 | F42 |
 



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ricardovaste View Drop Down
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Post Options Post Options   Quote ricardovaste Quote  Post ReplyReply Direct Link To This Post Posted: 24 June 2010 at 19:02
Not a bad job there Albin, thanks for sharing it with us!

I think the only problem I have with hacking the genuine rear mount is if it needs a repair at some point. There are a few reports of the aperture blades/mechanism 'exploding' with this lens, which would remove any chance of a warranty repair as far as I can see. But then, it's an inexpensive lens, so best get what you can of it and just enjoy it
I photograph the moments in people's lives that mean the most to them: Richard Harris Photography
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Grodan74 View Drop Down
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Post Options Post Options   Quote Grodan74 Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2010 at 12:35
Thanks :)

Regarding the warranty, I'll worry about it the day I have to. It's not the most expensive lens, and perhaps I can buy a mount from someone if I need warranty-repair. But as I said, Come the day, come the sorrow, or as in sweden: den dagen den sorgen

//Albin
α300 | Samyang 85/1.4 | Sony 50/1.8 | Kit-lens | Minolta 70-210 f4.5-5.6 | Minolta 28-85 f3.5-4.5 | F42 |
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Post Options Post Options   Quote le_huf Quote  Post ReplyReply Direct Link To This Post Posted: 04 July 2010 at 12:10
thanks for sharing. i ordered my chip several weeks ago but didn't have the heart to attach it without a good documentation. can't wait to try it out by myself.

happy shooting
le_huf
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ConfuciusTse View Drop Down
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Post Options Post Options   Quote ConfuciusTse Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2010 at 01:54
I have my Rokinon version and a chip I got on Ebay (I can't find James Lao!). Anyway, the chip has a tab on the outer curve that basically requires cutting into the mount which I am very hesitant to do. Also the bottom of the chip has a bump in the middle (think of a see-saw) so simple super glue won't work either.

Would be great if the A-mount version came pre-chipped (like the Nikon one). I'd be willing to pay a premium for that.

I actually find myself manually focusing pretty well but a quick green chirp would eliminate the zoom focus check step. Also, I had originally thought my A33 would default SSS to 50mm but it appears to be off altogether without a chip. Maybe I'm wrong though...any way to check?
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trainerKEN View Drop Down
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Post Options Post Options   Quote trainerKEN Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2010 at 21:32
...so, about 3 weeks ago, I picked up this lens used locally (actually from a member of Dyxum), and took some awesome pictures with my a550... last week I picked up a a900 (yes, I've been spoiling myself ), and finally got around to mount it on the FF body today... took it out and discovered there's a major back focus issue    I started thinking there was something wrong with the lens, so went back and mounted it on the a550 again... and no problems. Has anyone else experienced this? Is there a remedy?

Edited by trainerKEN - 23 November 2010 at 21:33
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teejay View Drop Down
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Post Options Post Options   Quote teejay Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2010 at 21:52
@trainerKen- have you changed your viewfinder screen on a900? The position of the screen influences your vision of the focus point - it can be adapted via 'shims' - thin plastic sheets you mount with the screen.
Could diopter adjustment be also the culprit?
Sony a99|HLV42|Minolta 17-35/2.8-4|24-105/3.5-4.5|28-105/3.5-4.5|24/2.8|35/2|35/1.4|50/1.4|85/1.4|100/2.8mRS|135/2.8|200/2.8|TC1.4|Sigma 180/5.6
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trainerKEN View Drop Down
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Post Options Post Options   Quote trainerKEN Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2010 at 21:59
Originally posted by teejay teejay wrote:

@trainerKen- have you changed your viewfinder screen on a900? The position of the screen influences your vision of the focus point - it can be adapted via 'shims' - thin plastic sheets you mount with the screen.
Could diopter adjustment be also the culprit?


I haven't touched the viewfinder screen... would I have to change this going from lens to lens?
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teejay View Drop Down
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Post Options Post Options   Quote teejay Quote  Post ReplyReply Direct Link To This Post Posted: 24 February 2011 at 05:25
Just thought I'd share my evening's work: successful chipping of the samyang!! I followed Slipsale's guide on the french forum alphadxd, all you need is some two component epoxy patty, and a file. A 1h job.
Here are the results:
Sony a99|HLV42|Minolta 17-35/2.8-4|24-105/3.5-4.5|28-105/3.5-4.5|24/2.8|35/2|35/1.4|50/1.4|85/1.4|100/2.8mRS|135/2.8|200/2.8|TC1.4|Sigma 180/5.6
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