a good digital back is like a drum scanner with a lense.how come i don't find any discussions on use of lage format digital backs?
I started working with Phase one P45 about two years ago. after lots of experience, I notice my working has become equivalent to working previously with large format.
Anybody who wants to share thoughts on difference in use between digital backs and analog large format camera's?
Probably cause most of us here cannot afford a digital back, so no need discussingIf I need that kind of resolution, I just mount my 5DII on my nodal head and shoot a quick multi-row pano.Autopano Giga software makes the stitching quick and easy.I have many shots in the gigapixel range that even a P65 couldn't touch, unless of course you shoot the P65 the same way
The Phase One P45 is capable of extraordinary detail and subtlety. A truly fine piece of equipment. But a P45 back in and of itself would not be considered large format here and would only be considered for discussion if used if used on a View Camera. Otherwise it is a lounge topic.
"The purpose of the forum is to provide a place for discussion of topics of particular interest to large format photographers. We especially encourage questions which will help build a repository of knowledge about the tools and techniques of large format photography, as opposed to "shopping" questions. For the purposes of this forum, we define "large format" as being essentially 4x5, or larger, sheet film. We do, however, allow what would otherwise be considered "medium format" sizes, IF exposed in a view camera (e.g. with a roll-film adapter), technical, or old-style press camera (e.g. the various Graphic cameras)."
Thanks,
Kirk
at age 73:
"The woods are lovely, dark and deep,
But I have promises to keep,
And miles to go before I sleep,
And miles to go before I sleep"
thank you for your reply mr. Gittings.
I am too serious to be involved in lounge topics.
I have struggled with the P45 back since I had it, for two years.
And however I am not actively involved in creating albumen prints or producing my own glass negatives, I still feel very much connected to the medium.
My point is that it is not only about the use of chemicals or not, and it is neither a matter of having medium format or 8"x10". It is about how you deal with your camera in relation to the environment in which you create a photographic image.
That is why I think that this is an appropriate topic to discuss in this chapter(?) "on photogrpahy". I think knowledge on large format photography goes beyond the use of a big camera.
Don't feed the trolls.
jtvr,
Sorry, but those are the policies of the forum. They have been discussed to death on the forum amongst the members and amongst the moderators (including many times recently for both) and are not likely to change anytime soon. The above statement I quoted is the standing policy of the forum now and for the foreseeable future.
As far as being "too serious" for the lounge.......I "seriously" doubt that you are any more serious than I am and I don't hesitate to post in the lounge when my topic doesn't fit the guidelines for the main forum.
Thanks,
Kirk
at age 73:
"The woods are lovely, dark and deep,
But I have promises to keep,
And miles to go before I sleep,
And miles to go before I sleep"
I've used a Phase back on a Sinar P2. The digital back requires more precise movements than LF film, which explains the need for the P3. The lenses for the digital back need to be wider to give the same image as would be gotten on 4x5 film, and the digital back puts more demands on the lens. In other words, some lenses that work fine with film don't work so well with the digital back. Finally, using tilt and swing can cause color shifts and other issues on the digital backs.
“You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
― Alexander Den Heijer, Nothing You Don't Already Know
Peter, your comments on lenses suitable/unsuitable for use with a P45 caught my attention. Other than lenses manufactured specifically for, can you make a broad statement about which modern coated LF lenses function well with the back? Are there particular lenses which work well for you?
I think Peter meant that the smaller format requires shorter lenses, and the greater enlargement ratios require lenses with better performance. The shorter lenses also require finer movements of the camera.Originally Posted by pdmoylan
And digital solutions that use small-format digital bodies place the sensor deep into the camera with respect to the lens to provide room for a reflex mirror. That requires lenses of retrofocus design. Some digital sensors benefit from the retrofocus design even if it isn't mechanically needed, to aim the image light more directly at the sensor sites.
And digital sensors have different MTF characteristics, and introduce potential aliasing problems. Lenses optimized for digital backs are often designed to provide a different MTF at different spatial frequencies to improve performance with respect to these issues.
But it is certainly possible to get excellent images using digital backs and conventional high-quality large-format lenses.
Rick "who wants a 4x5 digital solution, but who can't afford any likely possibilities" Denney
Technically no Large format lens will work optimally as the sensor requires that the rays illuminate the pixels fully and the rays passing through a digital lens strike the pixels at a different angle then the rays passing through a large format lens. In addition, digital lenses may use the cover glass over the sensor as the last element in the optical formula.
You may want to read the technical differences in the lens requirements here
http://www.rodenstock-photo.com/medi...3-26__8236.pdf
Posting Permissions
Reply With Quote
Bookmarks