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06-10-2015, 01:59 PM   #1
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Introduction and 6x7 90 mm lens question

I am new to the Pentax 6x7 and 67 world. I purchased a 67 with a 135 mm lens and I recently purchased a 6x7 90 mm lens. The 90 mm lens has a ring wit shutter speeds on it and I am wondering if it till conflict with the Pentaprism finder I use which has shutter speeds on it as well. The 67 135mm does not. All lenses are Asahi. Thank you in advance for any guidance.


Eric

06-10-2015, 02:04 PM   #2
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The 90mm is a leaf shutter lens. As long as you don't use the leaf shutter, it will function like an ordinary lens and you can use the camera's meter and shutter speed settings as you've always done.

This review goes in depth on how the LS mechanism works, and how it can be disabled:
SMC Takumar 6x7 90mm F2.8 Leaf Shutter Reviews - 67 Normal Primes - Pentax Lens Reviews & Lens Database

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06-10-2015, 02:48 PM   #3
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Welcome aboard, I see Adam has already replied, how's that for for a quick response.
06-15-2015, 12:19 AM   #4
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There is one notable, sometimes critical difference with the 90mm LS lens. On those 67 cameras that have it (not commonly the older 6x7), mirror lock-up can be used with the 90mm LS lens, but it cannot be used with the bigger 165mm f4 LS. Mirror lock-up is very useful with longer lenses on a tripod to reduce the horried mirror-slap and shutter whack for which these cameras are infamously known.

There is a specific operational process when using an LS lens with a flash (e.g. camera is set to 1/8 while leaf shutter is set to any sync speed marked on the shutter speed ring). This is because the shutter of the camera only syncs with the flash at that slow speed. It's unlikely to bother you if you're not planning to use a flash with the leaf shutter lens, but if you do, it's time then to read up on the do's and don'ts of camear+leaf shutter lens+flash photography!

06-17-2015, 04:03 AM   #5
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QuoteOriginally posted by Adam Quote
The 90mm is a leaf shutter lens. As long as you don't use the leaf shutter, it will function like an ordinary lens and you can use the camera's meter and shutter speed settings as you've always done.

This review goes in depth on how the LS mechanism works, and how it can be disabled:
SMC Takumar 6x7 90mm F2.8 Leaf Shutter Reviews - 67 Normal Primes - Pentax Lens Reviews & Lens Database
Thank you David.
06-17-2015, 04:04 AM   #6
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QuoteOriginally posted by Kerrowdown Quote
Welcome aboard, I see Adam has already replied, how's that for for a quick response.
Thank you Kerrowdown.

---------- Post added 06-17-15 at 04:05 AM ----------

QuoteOriginally posted by Silent Street Quote
There is one notable, sometimes critical difference with the 90mm LS lens. On those 67 cameras that have it (not commonly the older 6x7), mirror lock-up can be used with the 90mm LS lens, but it cannot be used with the bigger 165mm f4 LS. Mirror lock-up is very useful with longer lenses on a tripod to reduce the horried mirror-slap and shutter whack for which these cameras are infamously known.

There is a specific operational process when using an LS lens with a flash (e.g. camera is set to 1/8 while leaf shutter is set to any sync speed marked on the shutter speed ring). This is because the shutter of the camera only syncs with the flash at that slow speed. It's unlikely to bother you if you're not planning to use a flash with the leaf shutter lens, but if you do, it's time then to read up on the do's and don'ts of camear+leaf shutter lens+flash photography!
Thank you Silent Street/

---------- Post added 06-17-15 at 04:06 AM ----------

QuoteOriginally posted by Adam Quote
The 90mm is a leaf shutter lens. As long as you don't use the leaf shutter, it will function like an ordinary lens and you can use the camera's meter and shutter speed settings as you've always done.

This review goes in depth on how the LS mechanism works, and how it can be disabled:
SMC Takumar 6x7 90mm F2.8 Leaf Shutter Reviews - 67 Normal Primes - Pentax Lens Reviews & Lens Database
Thank you Adam.
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