Hi from Cape Town

petboy · 09-07-2020, 01:02 PM

Hi there, new on the site. Just bought a Takumar f2.8 105 lenses at a swap meet. This one has two black aperture rings on the top. Its been many years since I've worked with these. What was the purpose of having the two rings?
Thx!

pschlute · 09-07-2020, 01:21 PM

Originally posted by petboy

Hi there, new on the site. Just bought a Takumar f2.8 105 lenses at a swap meet. This one has two black aperture rings on the top. Its been many years since I've worked with these. What was the purpose of having the two rings?
Thx!

I would imagine it is so you can set one ring to the aperture you wish to use for the shot. This does not actually change the aperture. You can then focus the shot and frame using the benefit of wide open aperture, before closing the aperture (with the second ring) to what you require without having to remove your eye from the viewfinder.

MarkJerling · 09-07-2020, 02:26 PM

Originally posted by petboy

Hi there, new on the site. Just bought a Takumar f2.8 105 lenses at a swap meet. This one has two black aperture rings on the top. Its been many years since I've worked with these. What was the purpose of having the two rings?
Thx!

Welcome to the forum!
I'm from Cape Town too.

Gray · 09-07-2020, 09:40 PM - **1 Like**

Welcome!

Is this the lens? Takumar 105mm F2.8 (model 2)

The lens has aperture and preset aperture rings. Here's a good description of how to use a preset aperture, including the Takumar.
Preset Aperture Lenses – How They Work And Why You Need At Least One
Takumar 105mm F2.8 (model 2) Takumar 105mm F2.8 (model 2)

SharkyCA · 09-07-2020, 09:49 PM

Originally posted by petboy

Hi there, new on the site. Just bought a Takumar f2.8 105 lenses at a swap meet. This one has two black aperture rings on the top. Its been many years since I've worked with these. What was the purpose of having the two rings?
Thx!

Hi Petboy, Welcome to the forum. You may find this of interest! Super-Multi-Coated Takumar/Super-Takumar/Takumar 105mm F2.8 Reviews - M42 Screwmount Telephoto Primes - Pentax Lens Reviews & Lens Database

Wasp · 09-08-2020, 11:48 AM

Welcome here. I am from Pretoria myself.

That Takumar is an amazing find. Have fun with it.

09-07-2020, 01:02 PM	#1
petboy New Member Join Date: Sep 2020 Posts: 1	Hi from Cape Town Hi there, new on the site. Just bought a Takumar f2.8 105 lenses at a swap meet. This one has two black aperture rings on the top. Its been many years since I've worked with these. What was the purpose of having the two rings? Thx!

09-07-2020, 09:40 PM - 1 Like	#4
Gray Veteran Member Join Date: Oct 2011 Location: Cape Town Photos: Gallery Posts: 536	Takumar 105mm F2.8 (model 2) - preset aperture Welcome! Is this the lens? Takumar 105mm F2.8 (model 2) The lens has aperture and preset aperture rings. Here's a good description of how to use a preset aperture, including the Takumar. Preset Aperture Lenses – How They Work And Why You Need At Least One Takumar 105mm F2.8 (model 2) Takumar 105mm F2.8 (model 2)

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09-07-2020, 01:21 PM	#2
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,202	Originally posted by petboy Hi there, new on the site. Just bought a Takumar f2.8 105 lenses at a swap meet. This one has two black aperture rings on the top. Its been many years since I've worked with these. What was the purpose of having the two rings? Thx! I would imagine it is so you can set one ring to the aperture you wish to use for the shot. This does not actually change the aperture. You can then focus the shot and frame using the benefit of wide open aperture, before closing the aperture (with the second ring) to what you require without having to remove your eye from the viewfinder.

09-07-2020, 02:26 PM	#3
MarkJerling Moderator Site Supporter Join Date: May 2012 Location: Wairarapa, New Zealand Photos: Gallery \| Albums Posts: 20,406	Originally posted by petboy Hi there, new on the site. Just bought a Takumar f2.8 105 lenses at a swap meet. This one has two black aperture rings on the top. Its been many years since I've worked with these. What was the purpose of having the two rings? Thx! Welcome to the forum! I'm from Cape Town too.

09-07-2020, 09:49 PM	#5
SharkyCA Pentaxian Join Date: Sep 2017 Location: Carleton Place, Ontario, Canada Photos: Gallery Posts: 806	Originally posted by petboy Hi there, new on the site. Just bought a Takumar f2.8 105 lenses at a swap meet. This one has two black aperture rings on the top. Its been many years since I've worked with these. What was the purpose of having the two rings? Thx! Hi Petboy, Welcome to the forum. You may find this of interest! Super-Multi-Coated Takumar/Super-Takumar/Takumar 105mm F2.8 Reviews - M42 Screwmount Telephoto Primes - Pentax Lens Reviews & Lens Database

09-08-2020, 11:48 AM	#6
Wasp Pentaxian Join Date: Mar 2017 Location: Pretoria Photos: Gallery Posts: 4,661	Welcome here. I am from Pretoria myself. That Takumar is an amazing find. Have fun with it.