Page 3 of 5 FirstFirst 12345 LastLast
Results 21 to 30 of 49

Thread: Need Guidance on Getting a Sensitometer

  1. #21

    Join Date
    Jul 2018
    Posts
    363

    Re: Need Guidance on Getting a Sensitometer

    Hi Greg, really fantastic that you are producing these videos. I watched all 3 videos you have published so far and they are very well done. Great job!! Looking forward to watching the rest in this series.

    Larry

    Quote Originally Posted by Greg Davis View Post
    That video is mine. I also have two videos following along with the Kodak Basic Sensitometry Workbook. Part 1 ( Exposing the step tablet and drawing the curves) is here: https://youtu.be/eILVzTNWnq8, Part 2 (Calculating Gamma) is here: https://youtu.be/OnhcX3x2YvU. I will get Part 3 (Contrast Index) up this weekend.

  2. #22

    Join Date
    Jul 2018
    Posts
    363

    Re: Need Guidance on Getting a Sensitometer

    Very helpful for sure. Thank you!

    Quote Originally Posted by ic-racer View Post
    In addition to the information provided by Greg above, you might find these threads useful:

    https://www.photrio.com/forum/thread...e-soon.175464/
    https://www.photrio.com/forum/thread...hootout.95837/

  3. #23

    Join Date
    Jul 2018
    Posts
    363

    Re: Need Guidance on Getting a Sensitometer

    Hi, I want to make sure I am clear on a point that you made in the first link below.

    Are you saying that the blue and green LED sensitometers that are readily available today which were designed for Radiographic work I believe are sufficient for testing B&W 35mm roll films for the range of sensitometry tests as outlined in Kodak's "Basic Photographic Sensitometry Workbook"?


    Quote Originally Posted by ic-racer View Post
    In addition to the information provided by Greg above, you might find these threads useful:

    https://www.photrio.com/forum/thread...e-soon.175464/
    https://www.photrio.com/forum/thread...hootout.95837/

  4. #24

    Join Date
    Jan 2013
    Location
    Madisonville, LA
    Posts
    2,203

    Re: Need Guidance on Getting a Sensitometer

    Quote Originally Posted by LFLarry View Post
    Hi Luis, I had a typo in the title and in the original message. I meant to say "Need Guidance on Getting a Sensitometer". I guess I had densitometer on the brain. I have an X-Rite densitometer already, and now all I need is a Sensitometer for exposing the test films. Sorry about the typo and confusion.
    If you want to test film for speed and developing time, I use a densitometer, NOT a sensitometer.

  5. #25

    Join Date
    Jul 2018
    Posts
    363

    Re: Need Guidance on Getting a Sensitometer

    Hi Luis, I understand and agree with you. I am talking about using a sensitometer for creating a characteristic curve, determining D-min/D-max, Contrast Index, and exposure latitude. Basically, all the sensitometry "stuff". I have a solid process already in place with my densitometer only where I can accurately determine the EI rating for any film and developer combo as well as the associated development times for N, N+, N-, etc.

    My goal with the sensitometer in conjunction with the densitometer is to really compare same films in different developers and various films in the same developer to ultimately meet my personal creative vision.

    While the exposure part can be done with an enlarger and electronic timer, a sensitometer just makes that part of the process fast, painless, and easy with 35mm roll film. I also think it is more consistent than using an enlarger too.

    Quote Originally Posted by Luis-F-S View Post
    If you want to test film for speed and developing time, I use a densitometer, NOT a sensitometer.

  6. #26

    Join Date
    Mar 2002
    Location
    now in Tucson, AZ
    Posts
    2,993

    Re: Need Guidance on Getting a Sensitometer

    I don't know of any consumer-grade sensitometers being made today. When I worked for Eastman Kodak, my division designed, built, and sold a few of the Model 1-B sensitometer. It was used to characterize aerial camera and duplicating films, and create control strips for the various specialized processes used. I believe we supplied a few 1-Bs to other Kodak divisions, as well as the U.S. government. It was also about the size of a home washer-drier combo, and the price must have been quite substantial (as in if you have to ask...). Of course if you're a manufacturer selling hundreds of million dollars worth of quality product, you'd need something like that. Oddly enough, my first assignment at EK, in 1984, was to make photographs of that machine for an upgraded instruction manual.
    I'll guess that any of the various home-made devices mentioned above will serve your purposes quite well.

  7. #27
    Tin Can's Avatar
    Join Date
    Dec 2011
    Posts
    14,774

    Re: Need Guidance on Getting a Sensitometer

    I have no idea if these are worth buying, but there are 50 FS

    I think they were used for Mammogram X-Ray which was the last of the analog uses in NA

    https://www.ebay.com/sch/i.html?_fro...R+SENSITOMETER
    sin eater

  8. #28
    Tin Can's Avatar
    Join Date
    Dec 2011
    Posts
    14,774

    Re: Need Guidance on Getting a Sensitometer

    sin eater

  9. #29
    Greg Davis's Avatar
    Join Date
    Nov 2009
    Location
    Kentucky
    Posts
    572

    Re: Need Guidance on Getting a Sensitometer

    New video in the series, Contrast Index: https://youtu.be/TwTymRBedz4

  10. #30
    Greg Davis's Avatar
    Join Date
    Nov 2009
    Location
    Kentucky
    Posts
    572

    Re: Need Guidance on Getting a Sensitometer

    The blue and green X-ray sensitometers will be useful for comparing different films, but may not be full spectrum enough for contrast index, accurate film speed, etc. And they may not have a means of measuring illuminance. There are three EG&G units on ebay right now that are 5500K flash units and discussed in IC-racers threads on Photrio. They may need work on the electronics though.

Similar Threads

  1. Sensitometer For B&W Film?
    By LFLarry in forum Darkroom: Equipment
    Replies: 21
    Last Post: 24-Feb-2020, 22:12

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •