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04-14-2016, 08:40 PM   #1
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Need help with Pentax 67

1. What's the aprox aperture value for 2.4, 4, 5.6, and 8 in 35mm?

2. How do you focus for portrait? I usually get un-focused images quite a lot. First I focused on the head and then re-compose to the body usually. Due to the viewfinder, it's quite hard to see clearly.

3. Any differences between newer and older version of 105mm f2.4?

4. I want to prevent scratching and I heard that there is some kind of special tapes for film camera. Do you know the name of it?

5. Will Pentax 67ii prism provide brighter viewfinder?

6. Where can I send my Pentax 67 for cleaning dust, repairing, and etc?

04-14-2016, 09:39 PM   #2
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QuoteOriginally posted by rlatjsrud Quote
1. What's the aprox aperture value for 2.4, 4, 5.6, and 8 in 35mm?
The same.

QuoteOriginally posted by rlatjsrud Quote
3. Any differences between newer and older version of 105mm f2.4?
They all have the same optics, just different coatings (SMC on the later lenses) and a different cosmetic design for the latest version.

QuoteOriginally posted by rlatjsrud Quote
6. Where can I send my Pentax 67 for cleaning dust, repairing, and etc?
Eric can help you (pentaxs.com).

Adam
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04-15-2016, 05:50 AM - 1 Like   #3
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QuoteOriginally posted by rlatjsrud Quote
1. What's the aprox aperture value for 2.4, 4, 5.6, and 8 in 35mm?

2. How do you focus for portrait? I usually get un-focused images quite a lot. First I focused on the head and then re-compose to the body usually. Due to the viewfinder, it's quite hard to see clearly.

3. Any differences between newer and older version of 105mm f2.4?

4. I want to prevent scratching and I heard that there is some kind of special tapes for film camera. Do you know the name of it?

5. Will Pentax 67ii prism provide brighter viewfinder?

6. Where can I send my Pentax 67 for cleaning dust, repairing, and etc?
a few thoughts on the subject and hopefully helpful.

1. if you mean DOF equivalent f numbers when comparing 35mm and 67, using the diagonal as a reference, as they are different rectangular formats and assuming similar field of view,
Then for practical purposes the 105mm 67 lens at f2.4 will roughly equal a 50mm lens on 35mm format at f1.1, f4=f1.9, f5.6=f2.7, f8=f3.8. roughly a 2 stop difference.
It is quite useful to keep in mind if you come from 35mm or APS-C format and are not quite sure what to expect from a 67 camera.

2. takes a lot of practice, especially wide open. focus and recompose will be very likely to throw off focus. I shoot a 67ii and while I do see occasional misfocused images, then I have found it to be a practise thing. shooting it almost daily helps.
On the 67ii I tend to get precise focus using the micro prism and then the ground glass to correct for any misalignment or movement during when recomposing.

3. I have the latest model, but i think some changes to coatings and to the use of radioactive materials in the coatings on some of the older ones.

4. never heard of it

5. a definite yes. i find the 67ii a lot brighter and easier to focus.

6. I do not know any repair shops in the US, hopefully others will be able to help you out. Personally I use a local one in Copenhagen, Denmark.
04-15-2016, 01:43 PM   #4
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3. The Super Takumar used Thorium glass and nearly all of the SMC Takumars did not. The Thorium was replaced by another high index glass (possibly Lanthanum). A different design but both types perform well.
4. There are a few people that use gaffers tape to cover the surfaces.

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