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Forum: Pentax Medium Format 07-23-2009, 11:22 AM  
Need help choosing between 645N and 67!!
Posted By awksedgreep
Replies: 6
Views: 3,371
Other users in the forum can speak to practical experience blowing things up.

I'm also new to medium format and before I bought a camera I wanted to do some math coming from the digital world to see if it was worth it for me. If it helps I can put things into terms a digital photog would understand.

6x7 using velvia 50 lines per mm = 94.xx MP

Granted velvia is a very fine grain and not what you'd want for reproductions, but high quality natural color films would easily surpass 39MP digital backs . . . provided you scan them with a quality scanner. I have an epson 700 scanner and it does well enough for me, but you'll probably want a Nikon or better.

Expect fantastic results with a relatively inexpensive used 6x7, 67, or 67II. It will feel more comfortable to you than most medium format cameras as it works much like any SLR(only bigger). And all you really need is one inexpensive lens(55mm or 105mm??).

Good luck and keep us informed with the results.

'njoy,
awk
Forum: Pentax Medium Format 07-08-2009, 08:23 AM  
How does the camera "know" where the first frame starts?
Posted By awksedgreep
Replies: 9
Views: 3,559
Thanks so much for this thread. Really tired of losing my best shot during development. Also tired of getting 9 shots per roll.

Will try the multi-exposure button when loading now.

'njoy,
Mark
Forum: Pentax Medium Format 06-22-2009, 06:49 AM  
Question about entering Medium Format
Posted By awksedgreep
Replies: 15
Views: 3,483
Apparent was the key word you missed there. The larger the capture the more _compressed_ the image becomes allowing for bayer to disappear either completely or almost completely.

Bear in mind the eye cannot look at a photograph the way a computer can. Dynamic range is interpolated as pixels that are next to each other that have contrasting appearance. The eye cannot count the number of colors in a photo and say whether it is 12-bit or 14-bit.

Bayer does not affect dynamic range in the traditional sense. A 14-bit image is still 14-bit, but the interpolation of colors by shifting means that some of that color is wasted and affects the way the eye perceives dynamic range. Just zoom in on any digital image and you'll see what I mean. It kills sharpness and color transition between pixels that are next to each other affecting the way our eyes _view_ the photo.

Ken Rockwell(KenRockwell.com) has a decent writeup on bayer if anyone is curious.

If you were bored enough to do the math(like me), a very sharp ISO 50 film on a 6x7 back calculates to the equivalent of 94.xx MP if you calculate by lines per mm. With no bayer to contend with you're eyes are getting and using all of that data, especially if you blow it up to a large size. It's hard to say that anything digital can compete with that, even digital backs. The effective resolution of even a 39MP digital back would be a bit less than 39 if you take bayer into account.
Forum: Pentax Medium Format 06-21-2009, 10:48 PM  
Question about entering Medium Format
Posted By awksedgreep
Replies: 15
Views: 3,483
Just for reference. The 67II weighs about the same as a full body DSLR like the 1Ds M3 or Nikon D3. It's not that hard to handhold. The shutter and mirror are a good bit larger so they make a bit more noise when they fire. The 67 is a bit heavier than the 67II.

I own two 67s and one 67II as well as my D90 digital.
Forum: Pentax Medium Format 06-21-2009, 10:34 PM  
Question about entering Medium Format
Posted By awksedgreep
Replies: 15
Views: 3,483
Larger file does equal more apparent dynamic range to the eye. Digital suffers from bayer encoding and you have to get into some pretty big sensors(39MP Hassie for instance) to get away from it. Images just aren't as sharp yet on digital as all sensors are less than the represented MP number as a result.

Watch this space, however. Canon has managed to enhance bayer in their last round of image processors to a point where it's much less of an issue. The new 5D Mark II is extremely sharp as is the 1Ds MIII. Btw, I'm no evangelist as I shoot Nikon digital and Pentax film. Canon is making bayer less of an issue and it will simply be a matter of time before Nikon and Pentax follow suit. My original statement is still true however. If you want sharp, creamy, realistic looking pictures sell your house and buy a digital back or stick with medium format film. It's just THAT much better.

If you want to see for yourself just jump on flickr and enter hasselblad , 67 , medium format, etc and compare those to 35mm film scans or any digital uploads and you'll see what I mean. Even in smaller online versions of the files you can see the difference.
Forum: Pentax Medium Format 06-19-2009, 10:39 AM  
How do I view my 6x7 slides?
Posted By awksedgreep
Replies: 5
Views: 3,442
Another noob question. How do you all view your medium format slides? Is a light table the only option for slides this big?

'njoy,
Mark
Forum: Pentax Medium Format 06-19-2009, 06:33 AM  
My two 67s and 67II just arrived
Posted By awksedgreep
Replies: 7
Views: 2,761
Disregard previous post . . . found this guide for the 67.

Pentax 67 SLR, Pentax 2 1/4 instruction manual, user manual, PDF manual, free manuals

All three cameras are clean now and seem to be in working order. Thanks for the cleaning tips.

'njoy,
Mark
Forum: Pentax Medium Format 06-18-2009, 06:38 PM  
My two 67s and 67II just arrived
Posted By awksedgreep
Replies: 7
Views: 2,761
Well I was able to download a manual for the 67II, but the 67s have me a bit puzzled. Many of the nobs/switches are in different places and I can't seem to get the back off.

Know where I might find a PDF for the 67 book?

'njoy,
Mark
Forum: Welcomes and Introductions 06-18-2009, 06:36 PM  
New Pentax User as of today
Posted By awksedgreep
Replies: 4
Views: 725
Hmm, guess that would be _head_first_ now wouldn't it. :)

'njoy,
Mark
Forum: Welcomes and Introductions 06-18-2009, 06:34 PM  
New Pentax User as of today
Posted By awksedgreep
Replies: 4
Views: 725
Hi all,
I'm jumping in feet first with 3 new Pentax cameras that I received today.

2 x Pentax 67 bodies
1 x Pentax 67II body
6 Lenses 55, 90, 105, 135 Macro, 165, 200

I'm still cleaning and testing the gear to see if it's in working order. So far so good. The 67II is already on it's third roll of film. :) Wish I had a dark room at home, can't wait to see the prints.

'njoy,
Mark
Forum: Pentax Medium Format 06-18-2009, 12:02 PM  
My two 67s and 67II just arrived
Posted By awksedgreep
Replies: 7
Views: 2,761
I'm excited, but the dirty mirrors are bugging me. Is there anything I should be careful of when cleaning them. I know film isn't as problematic as digital, but I don't want to mess things up my first day with the cameras.

Any tips on cleaning these guys up a bit. They look like they've been in a closet for decades.

'njoy,
Mark
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