Super-Takumar 1:2.5/35 on Sony E-mount Body Focus Past Infinity

butangmucat · 07-14-2016, 03:13 AM

Hello everyone,

Finally got my hands on my first Pentax lens: the Super-Takumar 1:2.5/35 with a 49mm filter size. I don't have a Pentax digital body so I bought an M42 to E-mount adapter to try it out on my Sony a5000 body. The lens works pretty well, except that it seems to focus past infinity. I bought both the lens and the adapter from Taobao (because I am in China over the summer) but the adapter seems to be well-built. However I am suspecting that the lens cannot be screwed in correctly as I researched and found that it seems that the M42 screw adapter has several variants and some of the adapters might not work with some lenses.

The lens seems to focus to infinity when the DOP indicator reaches the distance of 2 meters and if I turn the focus ring more, infinity starts to get out of focus again.

My questions:
- Do I have the correct adapter for this lens, or it is because the adapter does not have the correct flange focal distance?
- Will it work with a correct focus to infinity if I use a M42 to PK adapter and a PK to E-mount adapter?
- I might be going out for trainwatching before I can get my hands on an working adapter, and I need to perform hyperfocal focus to take shots of trains. Is there a way for me to get hyperfocal focus working even with this adapter that focus beyond infinity?

P.S. I have uploaded some images for reference.

Sincerely

Attached Images

Wild Mark · 07-14-2016, 03:37 AM - **1 Like**

It looks like the right adapter. NEX = E Mount I think (someone with more knowledge should confirm this).

If the lens is reaching infinity focus at 2 m then one of two possibilities:

1) The adapter is horribly wrong and/or
2) The lens is not tuned correctly.

The latter is unlikely but possible. Do you have a spotmatic to check the lens focus accuracy?

**sergysergy** · 07-14-2016, 04:35 AM

Originally posted by butangmucat

Super-Takumar 1:2.5/35

Wild Mark · 07-14-2016, 04:37 AM

35/2 small error

butangmucat · 07-14-2016, 05:06 AM

Originally posted by sergysergy

I meant 35/2. Probably typed this because of my Vivitar 28/2.5.

**sergysergy** · 07-14-2016, 05:41 AM

Originally posted by butangmucat

I meant 35/2

butangmucat · 07-14-2016, 05:55 AM

Originally posted by Wild Mark

It looks like the right adapter. NEX = E Mount I think (someone with more knowledge should confirm this).

If the lens is reaching infinity focus at 2 m then one of two possibilities:

1) The adapter is horribly wrong and/or
2) The lens is not tuned correctly.

The latter is unlikely but possible. Do you have a spotmatic to check the lens focus accuracy?

I don't have a Spotmatic. I only have a decaying Ricoh body with a PK mount. However I did buy a M42 to PK adapter which sits flush from a reputable seller who claims to "hand tune and inspect before shipping." Hopefully this can tell something.

butangmucat · 07-14-2016, 05:56 AM

Originally posted by Wild Mark

It looks like the right adapter. NEX = E Mount I think (someone with more knowledge should confirm this).

If the lens is reaching infinity focus at 2 m then one of two possibilities:

1) The adapter is horribly wrong and/or
2) The lens is not tuned correctly.

The latter is unlikely but possible. Do you have a spotmatic to check the lens focus accuracy?

BTW, is there a way to get hyperfocal focus working? Maybe by treating 2m as infinity and set hyperfocal focus accordingly?

Wild Mark · 07-14-2016, 06:11 AM

Originally posted by butangmucat

BTW, is there a way to get hyperfocal focus working? Maybe by treating 2m as infinity and set hyperfocal focus accordingly?

You can change the focus relatively easily. You will need to break open the lens from the front element. Not hard, but you will need a spanner wrench and a little patience.

butangmucat · 07-14-2016, 06:14 AM

Originally posted by Wild Mark

You can change the focus relatively easily. You will need to break open the lens from the front element. Not hard, but you will need a spanner wrench and a little patience.

The seller provides a 14-day warranty so I will just send the lens back for calibration, but before I can figure out what is going on can I just substitute 2m for infinity to work around this problem?

Wild Mark · 07-14-2016, 06:18 AM

I wouldn't - send the adapter back

butangmucat · 07-14-2016, 06:21 AM

Originally posted by Wild Mark

I wouldn't - send the adapter back

Shall I wait at least for my M42-PK adapter to see if the fault is on the lens?

Wild Mark · 07-14-2016, 06:24 AM

Oh you want to send the lens back. Hmmm. Yeah, wait for the M42 - K adapter and check then. Good idea.

butangmucat · 07-14-2016, 06:28 AM

Originally posted by Wild Mark

Oh you want to send the lens back. Hmmm. Yeah, wait for the M42 - K adapter and check then. Good idea.

BTW if the adapter is faulty, what does focus past infinity indicate? The adapter been too short? I am a bit confused now.

Wild Mark · 07-14-2016, 06:30 AM - **1 Like**

Yes, the adapter is too short.

07-14-2016, 03:13 AM	#1
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709	Super-Takumar 1:2.5/35 on Sony E-mount Body Focus Past Infinity Hello everyone, Finally got my hands on my first Pentax lens: the Super-Takumar 1:2.5/35 with a 49mm filter size. I don't have a Pentax digital body so I bought an M42 to E-mount adapter to try it out on my Sony a5000 body. The lens works pretty well, except that it seems to focus past infinity. I bought both the lens and the adapter from Taobao (because I am in China over the summer) but the adapter seems to be well-built. However I am suspecting that the lens cannot be screwed in correctly as I researched and found that it seems that the M42 screw adapter has several variants and some of the adapters might not work with some lenses. The lens seems to focus to infinity when the DOP indicator reaches the distance of 2 meters and if I turn the focus ring more, infinity starts to get out of focus again. My questions: - Do I have the correct adapter for this lens, or it is because the adapter does not have the correct flange focal distance? - Will it work with a correct focus to infinity if I use a M42 to PK adapter and a PK to E-mount adapter? - I might be going out for trainwatching before I can get my hands on an working adapter, and I need to perform hyperfocal focus to take shots of trains. Is there a way for me to get hyperfocal focus working even with this adapter that focus beyond infinity? P.S. I have uploaded some images for reference. Sincerely Attached Images

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Super Takumar 55/1.8 infinity focus adjustment	okacat	Pentax SLR Lens Discussion	5	02-25-2016 11:06 AM
Does the 35/2.4 focus on infinity?	Flugelbinder	Pentax SLR Lens Discussion	15	12-31-2014 10:21 AM
Asahi Super-Takumar 1:1.8/55mm Lens won't focus to infinity	bingostew	Pentax SLR Lens Discussion	15	10-25-2012 08:19 AM

07-14-2016, 03:37 AM - 1 Like	#2
Wild Mark Veteran Member Join Date: Jun 2013 Location: Newcastle Photos: Gallery \| Albums Posts: 1,954	It looks like the right adapter. NEX = E Mount I think (someone with more knowledge should confirm this). If the lens is reaching infinity focus at 2 m then one of two possibilities: 1) The adapter is horribly wrong and/or 2) The lens is not tuned correctly. The latter is unlikely but possible. Do you have a spotmatic to check the lens focus accuracy?

07-14-2016, 04:35 AM	#3
sergysergy Site Supporter Join Date: Jan 2011 Photos: Gallery Posts: 5,170	Originally posted by butangmucat Super-Takumar 1:2.5/35

07-14-2016, 04:37 AM	#4
Wild Mark Veteran Member Join Date: Jun 2013 Location: Newcastle Photos: Gallery \| Albums Posts: 1,954	35/2 small error

07-14-2016, 05:06 AM	#5
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709 Original Poster	Originally posted by sergysergy I meant 35/2. Probably typed this because of my Vivitar 28/2.5.

07-14-2016, 05:41 AM	#6
sergysergy Site Supporter Join Date: Jan 2011 Photos: Gallery Posts: 5,170	Originally posted by butangmucat I meant 35/2

07-14-2016, 05:55 AM	#7
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709 Original Poster	Originally posted by Wild Mark It looks like the right adapter. NEX = E Mount I think (someone with more knowledge should confirm this). If the lens is reaching infinity focus at 2 m then one of two possibilities: 1) The adapter is horribly wrong and/or 2) The lens is not tuned correctly. The latter is unlikely but possible. Do you have a spotmatic to check the lens focus accuracy? I don't have a Spotmatic. I only have a decaying Ricoh body with a PK mount. However I did buy a M42 to PK adapter which sits flush from a reputable seller who claims to "hand tune and inspect before shipping." Hopefully this can tell something.

07-14-2016, 05:56 AM	#8
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709 Original Poster	Originally posted by Wild Mark It looks like the right adapter. NEX = E Mount I think (someone with more knowledge should confirm this). If the lens is reaching infinity focus at 2 m then one of two possibilities: 1) The adapter is horribly wrong and/or 2) The lens is not tuned correctly. The latter is unlikely but possible. Do you have a spotmatic to check the lens focus accuracy? BTW, is there a way to get hyperfocal focus working? Maybe by treating 2m as infinity and set hyperfocal focus accordingly?

07-14-2016, 06:11 AM	#9
Wild Mark Veteran Member Join Date: Jun 2013 Location: Newcastle Photos: Gallery \| Albums Posts: 1,954	Originally posted by butangmucat BTW, is there a way to get hyperfocal focus working? Maybe by treating 2m as infinity and set hyperfocal focus accordingly? You can change the focus relatively easily. You will need to break open the lens from the front element. Not hard, but you will need a spanner wrench and a little patience.

07-14-2016, 06:14 AM	#10
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709 Original Poster	Originally posted by Wild Mark You can change the focus relatively easily. You will need to break open the lens from the front element. Not hard, but you will need a spanner wrench and a little patience. The seller provides a 14-day warranty so I will just send the lens back for calibration, but before I can figure out what is going on can I just substitute 2m for infinity to work around this problem?

07-14-2016, 06:18 AM	#11
Wild Mark Veteran Member Join Date: Jun 2013 Location: Newcastle Photos: Gallery \| Albums Posts: 1,954	I wouldn't - send the adapter back

07-14-2016, 06:21 AM	#12
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709 Original Poster	Originally posted by Wild Mark I wouldn't - send the adapter back Shall I wait at least for my M42-PK adapter to see if the fault is on the lens?

07-14-2016, 06:24 AM	#13
Wild Mark Veteran Member Join Date: Jun 2013 Location: Newcastle Photos: Gallery \| Albums Posts: 1,954	Oh you want to send the lens back. Hmmm. Yeah, wait for the M42 - K adapter and check then. Good idea.

07-14-2016, 06:28 AM	#14
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709 Original Poster	Originally posted by Wild Mark Oh you want to send the lens back. Hmmm. Yeah, wait for the M42 - K adapter and check then. Good idea. BTW if the adapter is faulty, what does focus past infinity indicate? The adapter been too short? I am a bit confused now.

07-14-2016, 06:30 AM - 1 Like	#15
Wild Mark Veteran Member Join Date: Jun 2013 Location: Newcastle Photos: Gallery \| Albums Posts: 1,954	Yes, the adapter is too short.