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04-24-2008, 12:08 AM   #46
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QuoteOriginally posted by Canada_Rockies Quote
And the Asahiflex was 39mm screw mount. Pentax is [Asahiflex + Pentaprism]. They enlarged the mount while they were at it. So, you can mount an Asahiflex 39mm lens on your m42 adapter and mount that on your K mount Pentax SLR. I am not sure the mount to film distance is the same, however - it might not focus to infinity.
To add my 2 cents to this thread: sorry Guys, I have won because I have used the 50mm f/3.5 Asahi-Kogaku Takumar (Type I), from my Asahiflex I, on my (then) *ist DS. Technically speaking, this is Pentax's oldest 35mm SLR lens as it was made for their first 35mm SLR (and first Japanese 35mm SLR) in 1951/1952. The lens is of a well-known design (Tessar-type) but is lacking a little in contrast (the last time I tried was in 2005, I'll see if I can find the test shots I made with it).

@ Canada_Rockies: yes, this is possible but the setup won't focus to infinity because the M37 (not 39mm, the Asahiflex mount is smaller than the Leica thread mount!) to M42 adapter has a small flange.

04-25-2008, 06:32 PM   #47
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QuoteOriginally posted by Asahiflex Quote
I have used the 50mm f/3.5 Asahi-Kogaku Takumar (Type I)
A Tessar lens. Sharp and compact.

QuoteOriginally posted by Asahiflex Quote
@ Canada_Rockies: yes, this is possible but the setup won't focus to infinity because the M37 (not 39mm, the Asahiflex mount is smaller than the Leica thread mount!) to M42 adapter has a small flange.
What kind of adapter do you have? The original Pentax M37 to M42 adapter has no flange and allows for infinity focusing.

Cheers!

Abbazz
04-25-2008, 07:01 PM   #48
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QuoteOriginally posted by Asahiflex Quote
To add my 2 cents to this thread: sorry Guys, I have won because I have used the 50mm f/3.5 Asahi-Kogaku Takumar (Type I), from my Asahiflex I, on my (then) *ist DS. Technically speaking, this is Pentax's oldest 35mm SLR lens as it was made for their first 35mm SLR (and first Japanese 35mm SLR) in 1951/1952. The lens is of a well-known design (Tessar-type) but is lacking a little in contrast (the last time I tried was in 2005, I'll see if I can find the test shots I made with it).

@ Canada_Rockies: yes, this is possible but the setup won't focus to infinity because the M37 (not 39mm, the Asahiflex mount is smaller than the Leica thread mount!) to M42 adapter has a small flange.
Sorry - mea culpa. 37 it is!
04-25-2008, 09:17 PM   #49
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Have come across an Auto-Takumar 1:2.2/55 in my fathers collection. Looks like it is from 1961? Also a Tele-Tokina 1:4.5 200mm which I have no idea it's age.
Haven't tried either of them yet (nor do I know how to make them compatible to my K10 as I'm a newby. But if I ever do, I'll be sure to post...)

05-03-2008, 10:43 AM   #50
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I've got Super Takumar 24mm, 50mm and 105mm lenses, each manufactured between about 1964 and 1967, bought new by my father and used by him til about 1980, and then by me until the present day on Spotmatic and K1000 with adapter.
05-03-2008, 11:22 AM   #51
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QuoteOriginally posted by beaumont Quote
Have come across an Auto-Takumar 1:2.2/55 in my fathers collection. Looks like it is from 1961? Also a Tele-Tokina 1:4.5 200mm which I have no idea it's age.
Haven't tried either of them yet (nor do I know how to make them compatible to my K10 as I'm a newby. But if I ever do, I'll be sure to post...)
You are correct on the Takumar 1:2.2 55mm - 1961 was the date of introduction and discontinued the same year. This was an attempt to make a less expensive version of the 2.0/55mm Auto Takumar. I have been trying to find a very good one of these for a long time for my collection.

No real trick to using it... use it the same as any other Takumar, but don't use the "Auto feature" to set the aperture to open as there is no way to release it without taking the lens off. As a practical matter it is perhaps most like using a preset lens or a Super Takumar set to manual without using the auto switch. I usually focus with aperture set manually to wide open (what Pentax used to call "Bright field focusing" in their manuals), then close down to the desired aperture, hit the green button to "stop down" exposure and shoot away. I've begun using a digital light meter as well these days since I get to think through what aperture/shutter speed I will use and see the combinations before framing. Also it is an all too familiar sequence for me already and comes quite naturally.

Using these old lenses on a digital body really is a nice thing. Outline of steps...

1) Set camera to “allow use of aperture ring”
2) Open the aperture with the aperture ring for focusing.
3) Close the aperture with the aperture ring to the desired aperture to meet DOF requirements for example.
4) Hit ‘green button’ to meter.
5) Hit shutter button to take picture.

Regards,
05-03-2008, 01:19 PM   #52
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I certainly don't have the oldest, but I have the first!! The first Pentax zoom lens that is - the 75-150mm zoom made in 1964. No test pics yet - just got the adapter.
07-30-2010, 01:21 AM   #53
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I was about to start a similar thread as this one, but luckily searched first. It seems that many users use significantly older lenses than I do as I believe my oldest is the preset Macro-Takumar which was to my knowledge made around 1966-69.

Frankly, I don't use my manual focus lenses that much, just give them a try every now and then.

What's the oldest lens that you use regularily and can mount properly to your camera (meaning directly or with a proper adapter, not blu-tac or glue )?

07-30-2010, 05:49 AM   #54
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QuoteOriginally posted by Asahiflex Quote

@ Canada_Rockies: yes, this is possible but the setup won't focus to infinity because the M37 (not 39mm, the Asahiflex mount is smaller than the Leica thread mount!) to M42 adapter has a small flange.
this is only true when using the original adapter on an m42 kmount adapter. if the adapter is used on a Pentax m42 body, you retain infinity focus, (and for reference, the register distance is the same on both m37 and m42) as all m42 mount pentaxes have a small recess cut into the mount for the use of this adapter. im not sure how well known this is, as the adapter itself is something that is seldom found. I own one, but do not currently own any m37 lenses. I only found this out when mounting it to my SV to see if it does indeed sit flush, and when I did, I realized that what appears to be a simple cosmetic touch is actually purposely designed. or so it would seem. the reason the adapter doesn’t sit flush when using it on a kmount body is simply because the kmount m42 adapter does not have this recess.

I can take some photos for proof if need be.
07-30-2010, 05:58 AM   #55
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I have this 135mm lens by A Schact Ulm. I am sure at one point it had a helicoid but it came to me on a bellows. I have only used it sparingly because of the danger to the bellows. It is not an m42 lens, but there is an adapter ring on it.
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07-30-2010, 06:04 AM   #56
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QuoteOriginally posted by séamuis Quote
this is only true when using the original adapter on an m42 kmount adapter. if the adapter is used on a Pentax m42 body, you retain infinity focus, (and for reference, the register distance is the same on both m37 and m42) as all m42 mount pentaxes have a small recess cut into the mount for the use of this adapter. im not sure how well known this is, as the adapter itself is something that is seldom found. I own one, but do not currently own any m37 lenses. I only found this out when mounting it to my SV to see if it does indeed sit flush, and when I did, I realized that what appears to be a simple cosmetic touch is actually purposely designed. or so it would seem. the reason the adapter doesn’t sit flush when using it on a kmount body is simply because the kmount m42 adapter does not have this recess.

I can take some photos for proof if need be.
You are right! I never found this out as I never mounted my M37 lenses on a M42 body. My Spotmatic II indeed has the small recess in the mount, and the Asahiflex adapter fits flush too. Again something typically Pentax. The backwards compatibility goes further back than I thought.

It's hard not to love the brand!
07-30-2010, 06:07 AM   #57
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QuoteOriginally posted by emr Quote
What's the oldest lens that you use regularily and can mount properly to your camera (meaning directly or with a proper adapter, not blu-tac or glue )?
That must be my 83mm f/1.9 Asahi-Kogaku Takumar from 1957 or so. It started off
as a M37 mount lens, but one of the former owners had it professionally machined to a M42 lens.

07-30-2010, 06:53 AM   #58
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QuoteOriginally posted by Asahiflex Quote
You are right! I never found this out as I never mounted my M37 lenses on a M42 body. My Spotmatic II indeed has the small recess in the mount, and the Asahiflex adapter fits flush too. Again something typically Pentax. The backwards compatibility goes further back than I thought.

It's hard not to love the brand!
exactly what I thought when I first found this out. this isn’t something that is covered in the ultimate screw mount guide?
07-30-2010, 07:03 AM   #59
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QuoteOriginally posted by séamuis Quote
exactly what I thought when I first found this out. this isn’t something that is covered in the ultimate screw mount guide?
Not with so many words, it only states that it allows the "normal use" of Asahiflex lenses. This could also mean that infinity is retained of course.
07-30-2010, 07:23 AM   #60
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My oldest lens is from ~ 1919 is a Zeiss 7.5 cm f6.3 Tessar on a Comtessa Nettel Picolette. My oldes m42 lens is a Victar 5 cm f2.9 from the 1940s. My oldest Takumar is the Asahi-Kogaku 58mm f2.4 (m37 mount). It was probably made in 1956.

This is a good example of an old thread to revive!
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