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  1. #1
    Join Date
    Feb 2006
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    Des Plaines, IL
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    Lightbulb Improvement: Manual Focusing Screen

    I went ahead and had a Katz-Eye™ manual focusing screen added to the α700

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    so I could make optimal use of my various TAMRON Adaptall 2 MF lenses (135 f/2.5; 200mm f/3.5; 70-200mm f/4; 200-500mm f/6.9)

    That 135mm f/2.5 seems to be a super lens ... and I am interested to see how improved the quick focusing will be.


    SONY α100 w/ TAMRON Adaptall 2 135mm f/2.5 lens

    Unfortunately, the closest focus this particular lens can do is just under four feet, but it should make for a decent portrait lens though.

    Anyway, the camera is on the return trip from Maine, where the Katz-Eye™ was installed. I am anxious to get it back and see the results. Allthough I could obtain a sharp enough focus after a few shots, with the DSLR, my eyes just don't have the twenty-year-old's acuity any more. Yes, you guys, we all get old. Just you wait ... you little whippersnappers! I am pretty certain this will tighten things up a bit ... and I'll be able to seriously use this older glass, which is still sharp as heck ... a bit more successfully.
    Last edited by DonSchap; 04-22-2008 at 07:51 PM.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr® & Sdi

  2. #2
    Join Date
    Dec 2007
    Posts
    1,759
    i put one in my old a100...fit like crap though...
    but i got it lined up...didn't like it though..so i took it back out

  3. #3
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
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    Well ... they are insisting on doing the fitting for the customer, so let's see, eh?
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr® & Sdi

  4. #4
    Join Date
    Dec 2007
    Posts
    1,759
    "they are insisting on doing the fitting for the customer"...lol.i know why. it fits so loose you have to carefully center it...the problem that i didn't like most was it would go black in low light situations...i forgot about that since my sr101 days

  5. #5
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,554

    Red face Additional options ...

    I had the OptiBright Treatment also added ... which Katz-Eye details as this:

    "Although the Katz Eye™ focusing screens look good and they are bright as they are, if you want the ultimate appearance they can be treated to improve their brightness. We provide a process called OptiBrite which is designed to improve the brightness of our screens at small apertures or in dim light. The treatment can increase the apparent brightness by about 2 stops or more in some conditions. The extra brightness is difficult to quantify exactly due to the subjective nature of human vision, but it tends to increase with smaller aperture. At f1.4, for example, the OptiBrite treatment provides only a moderate improvement — perhaps ˝ f–stop equivalent or less. But, as the aperture gets smaller, the improvement gets greater. By f6.3, it's good for about 1 full stop. By f16, it might be equivalent to 2 stops or more, depending on the conditions. It's definitely a pleasant change. For the record though, OptiBrite will not affect the ‘blackout’ phenomenon, where half the prism(s) turn black around f5.6 or so. The OptiBrite treatment only affects the brightness of the matte (ground glass) portions of the screen. If you need small aperture performance below f5.6, our Katz Eye™ “Plus” series of focusing screens will allow split prism performance well past f11. More information on the “Plus” screens can be found here. Please be aware that in most cases, the OptiBrite treatement does not change the light metering significantly. However, in some cameras the increased brightness of the focusing screen resulting from the OptiBrite treatment may slgithly affect the camera's light meter. In cameras that are affected by the treatment, the effect is usually minimal – OptiBrite treatment will typically cause no more than a 1/3 EV shift of the light meter. With DSLR's, it is a simple matter to take a quick test shot, check the histogram, and adjust your exposure compensation as required to ensure that you achieve proper exposures. The OptiBrite treatment costs an additional $55USD on all Katz Eye™ Screens."


    So I guess we shall see what we shall see ...
    Last edited by DonSchap; 04-28-2008 at 08:14 AM.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr® & Sdi

  6. #6
    Join Date
    Dec 2007
    Posts
    1,759
    Then Are Your Eyes Good Enough To See Things Line Up...lol

  7. #7
    Join Date
    Feb 2006
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    Des Plaines, IL
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    Thumbs up Added attractions ...

    Quote Originally Posted by SONYNUT View Post
    Then Are Your Eyes Good Enough To See Things Line Up...lol
    Probably not ...



    Although, I did also add this:

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    “Rule of Thirds” Grid

    This commonly requested pattern can be very helpful for composition based on the "Rule of Thirds".



    I tend to already practice it ...

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    but, I figure it is a good reminder.
    Last edited by DonSchap; 04-23-2008 at 07:28 PM.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr® & Sdi

  8. #8
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,554

    Smile Some manual operation required ...

    Halleluiah, the α700 is back!

    α700 Katz Eye™ installed:
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    Okay ... I did initially notice that focusing, with normal lighting, is tremendously improved. As I dimmed the lights, it got to be more difficult.

    As I closed down the aperture, again, more difficult to focus. I found that focusing at the widest aperture and then immediately adjusting the aperture to what you want seems to solve that issue. Technique and procedure, that's all.

    It definitely improves the performance of the AF lenses (135mm f/2.5, 200mm f/3.5, 70-200mm f/4.5, 500mm f/8 Reflex and 200-500mm f/6.9).

    If the weather clears up, tomorrow ... I may just head for the lake (Lake Michigan) have a manual lens day ... just for the fun of it. See if I can improve my DRO experiences along the way, also.

    Is it worth it? Hard to say, at this point ... but, it does speed up my manual focusing, enormously. That's definitely improved and worth something. I have five lenses that have suddenly improved in performance and usefullness.

    Autofocus ... okay, here's a spot of trouble with α700. The α700 has three focusing modes: WIDE, SPOT & LOCAL (Camera defaults to WIDE, when in the AUTO). "Wide" and "Spot" seem to work fine ... "Local" control ... if you select anything other than center ... I think it's kind of lost, which effectively has killed it. Personally, I have never use "Local" ... so I don't suffer with its loss, but I am sure there are others, out there, who might resent losing it.

    Anyway ... that's it for now
    Last edited by DonSchap; 04-28-2008 at 08:13 AM.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr® & Sdi

  9. #9
    Join Date
    Dec 2007
    Posts
    1,759
    did you get snow today?..lol...winter just won't quit in mn

  10. #10
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,554
    Nah ... actually ... the rains dried up, around 10AM .. and it was windy as heck, but nothing too serious. Amazing weather this year ... thank goodness nothing ever came of that "Global Thingy", eh?
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr® & Sdi

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