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Samyang 85mm - Focusing question
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PostPosted: Sat Aug 29, 2009 3:59 pm    Post subject: Samyang 85mm - Focusing question Reply with quote
Hello,

This lens seems very interesting and, as it is fully manual, I'm wondering the following if I were to buy one :

As I have a 40D and an AF confirm adapter PK/EOS, wouldn't it be more interesting to buy a Samyang 85mm f1.4 with PK Mount instead of an EOS Mount ?

Or, maybe it's better to buy a confirm chip and glue it on the EOS mount ?

Just an idea passing by... Confused

Thanks for your comments and advices. Smile
Olivier


PostPosted: Sat Aug 29, 2009 4:15 pm    Post subject: Reply with quote
Glue the chip on an eos mount.


PostPosted: Sat Aug 29, 2009 4:23 pm    Post subject: Reply with quote
I am planning to take this lens also. My choice Nikon PK or M42 mount if it exists. With above mounts I can use them more than one camera system with adapter. To glue directly more risky than buy an a adapter with chip. If you never did it before easy to make mistake and ruin lens.


PostPosted: Sat Aug 29, 2009 5:35 pm    Post subject: Reply with quote
To glue a confirm chip on this lens is not a serious problem anyway.
Unscrew with the 3 screws the EOS Mount from the lens,
Fit the mount into the camera, mark the point were the chip-contacts take place, glue the chip to the EOS mount, and reverse the Procedure of dismantling.

No Problem at any time.

Takes 5 minutes for the whole story.
You should take first take "super glue" and for strengthen the chip on the mount wall take 2 component glue.

LG
Hinnerker


PostPosted: Sat Aug 29, 2009 8:26 pm    Post subject: Reply with quote
Attila wrote:
I am planning to take this lens also. My choice Nikon PK or M42 mount if it exists. With above mounts I can use them more than one camera system with adapter.


M42 mount would be an excellent choice, but it doesn't exist due to the rear element being too large for M42, albeit just barely. Indeed it would be possible to replace the original mount with an electric M42 adapter like I've done on a few other lenses, but to maintain original infinity focus position it may be easier to just glue a chip to the mount on the lens (or adapt through Nikon or Pentax K-mount if you have that option; unfortunately it's not possible with Sony/Minolta AF without additional glass elements).


Edit: After some consideration, I think it might be just be possible to convert this lens to M42 mount. The rear element would just barely fit through the M42 mount, but the mount itself should be made of steel or something equally durable because it would be very thin at the threads. That's probably why I've never seen an M42 mount with so large an opening on an actual M42 lens.

Last edited by Arkku on Mon Aug 31, 2009 12:25 am; edited 1 time in total


PostPosted: Sat Aug 29, 2009 8:29 pm    Post subject: Reply with quote
Arkku wrote:
Attila wrote:
I am planning to take this lens also. My choice Nikon PK or M42 mount if it exists. With above mounts I can use them more than one camera system with adapter.


M42 mount would be an excellent choice, but it doesn't exist due to the rear element being too large for M42, albeit just barely. Indeed it would be possible to replace the original mount with an electric M42 adapter like I've done on a few other lenses, but to maintain original infinity focus position it may be easier to just glue a chip to the mount on the lens (or adapt through Nikon or Pentax K-mount if you have that option; unfortunately it's not possible with Sony/Minolta AF without additional glass elements).


Thank you to make it to clear! My rule is buy a camera with shorter register distance as possible and by a lens with longer one as possible Wink Both together best insurance for long time usable system.


PostPosted: Sat Aug 29, 2009 8:47 pm    Post subject: Reply with quote
Thanks everybody for your answers.

Just a thing : I know what a "super glue" is but don't see clearly what a "component glue" is. Is it a glue used in electronics ? Would you be so kind to give a link to show such a glue ?

Than you.


PostPosted: Sat Aug 29, 2009 8:51 pm    Post subject: Reply with quote
Olivier wrote:
Thanks everybody for your answers.

Just a thing : I know what a "super glue" is but don't see clearly what a "component glue" is. Is it a glue used in electronics ? Would you be so kind to give a link to show such a glue ?

Than you.


Component glue is stored in two parts A+B and you mix them right before use it. This kind of glue the strongest one. Stronger than metal... this is the reason why I not suggested to glue cheap directly to mount. If cheap will not works one time it will be hard or impossible to remove it easily.


PostPosted: Sat Aug 29, 2009 9:47 pm    Post subject: Reply with quote
Olivier wrote:
Thanks everybody for your answers.

Just a thing : I know what a "super glue" is but don't see clearly what a "component glue" is. Is it a glue used in electronics ? Would you be so kind to give a link to show such a glue ?

Than you.


As Attila did say.. its a glue with 2 components, a+b, mixed before using it. Dont worry, you can remove the glue from the metal if you want. Its the best way to support the chip during the torque moment.

The collar/flange? is to small for only using super glue.. so you must strenghten the position of the chip with the 2K glue.



It works and fits perfect.

LG
Hinnerker


PostPosted: Sat Aug 29, 2009 10:03 pm    Post subject: Reply with quote
OK. Understood. Thanks again.

I know this glue under a brand name : "Araldite".
I understand its interest because of the torque strength.

Hinnerker, is it a Samyang on wich you did that ?


PostPosted: Sat Aug 29, 2009 10:15 pm    Post subject: Reply with quote
Olivier wrote:
OK. Understood. Thanks again.

I know this glue under a brand name : "Araldite".
I understand its interest because of the torque strength.

Hinnerker, is it a Samyang on wich you did that ?


Yes, its the Samyang. Its really easy to modify the mount with the chip. You can unscrew the mout by 3 Screws and work on the mount without touching the lens.

Hinnerker


PostPosted: Sat Aug 29, 2009 10:25 pm    Post subject: Reply with quote
Thank you Hinnerker. Very Happy


PostPosted: Fri Sep 18, 2009 9:40 am    Post subject: Reply with quote
Thanks for the info. I found this on eBay.

http://cgi.ebay.com/AF-confirm-chip-chipset-for-Canon-EOS-EF-lens-adapter_W0QQitemZ250493268957QQcmdZViewItemQQptZDigital_Camera_Accessories?hash=item3a528ff3dd&_trksid=p3286.c0.m14

Does the chip require any programming or anything like that, or does it just work? I remember hearing about some chips being programmed but I'm not sure if that was related to focus or just EXIF Info.

Also: as I understand it, I could buy this lens and mount the AF Confirm and be able to attain focus confirmation for f/1.4 on a Rebel XT/350D at the focus points?

Thanks for the info!


PostPosted: Fri Sep 18, 2009 4:59 pm    Post subject: Reply with quote
Oh, man, gluing just seems like such an error prone procedure. I would not trust myself to do it properly. I would just get the NIkon mount version and a Nikon to EOD AF confirm adapter. Save yourself the hassle and preserve your resale value. Nikon is easier to adapt than PK mount so it should work better.
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