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  1. #1
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,560

    Lightbulb When it has to be 800mm and nothing else will do

    Okay, here is a fun and inexpensive lens to mount.

    Name:  a850-w-800mm_DSC1098.jpg
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    Pictured: α850 w/ ProOptic 800mm f/8 Relex 105mm lens

    Say you are out hiking ... and it's going to be a long hike ... through some serious brush and foliage. You are also climbing and that pack can be a real ... nasty item after awhile. In fact, you just cannot bring the "old $6000 pipe" of an 800mm f/5.6 (10.5 lbs) with you. Well, drop back to a constant f/8 and enjoy this short guy at only 2 lbs and a smidge over $200. Yeah, just a couple c-notes. Imagine.

    With it nearly masking the entire front of the camera, this rather obvious Reflex lens will definitely get you some Q&A as you shoot. Fact is, it does make for a very light tote, compared to almost any other long lens ... other than another reflex, of course.

    Just something to consider ... when you want some reach, are not too terribly concerned with precision IQ and do not want to break the budget. I know ... what's new? If you wouldn't spend $300 for your primary DSLR, what makes you think your spending $200 on this thing?

    BTW: It is effectively 1200mm f/8 on the APS-C camera. Now, that is definitely getting out there and .. here comes the sun.
    Last edited by DonSchap; 01-06-2010 at 02:13 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 2008
    Location
    Florence Alabama
    Posts
    17
    Do you have any sample shots with this lens. I've seen thses around and kind of wrote them off, but the practicality for a long walking day can't be ignored. How bad is the IQ versus the longer bodied lenses? suppose I could check out reviews across the net, but something makes me trust, and want YOUR opinion, Don.

  3. #3
    Join Date
    Dec 2007
    Posts
    1,760
    i got mine for 100 bucks..works fine. but some people whine about the circular boken...ya whatever

  4. #4
    Join Date
    Dec 2007
    Posts
    2,562
    It is a MF lens.


    Frank
    Sony A77
    Sony A580
    Sony A 100
    Maxxum 400si.
    Sony 18-70 Kit Lens
    Minolta AF 35-70
    Minolta AF 50 f/1.7
    Tamron 70-300 f/4-5.6 Di LD
    Tamron 60mm Macro
    Tamron 17-50 f/2.8
    Tamron 2x Converter
    Sony HVL-F42AM
    Quantaray 70-300 4.5-5.6 Macro
    Slingshot 200 Bag



    http://www.flickr.com/photos/22083244@N06/

    http://s305.photobucket.com/albums/nn219/sparkie1263/

  5. #5
    Join Date
    Dec 2007
    Posts
    1,760
    Yes.......

  6. #6
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,560
    Believe me, this baby is smooth for its size. Image wise ... I have to say if you get it focused correctly, it can deliver a decent shot. It is no 17-50 beauty, but it's also seriously longer than much of anything else. It is like having a coffee can on the front of your camera.

    I will post later ... we have a snow storm coming that should really play hell with Chicago.
    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

  7. #7
    Join Date
    Dec 2007
    Posts
    1,760
    Were is that global warming when you need it?

  8. #8
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    800mm f8 or 1200mm on APS-C. A nightmare to focus unless you have an M-screened 850/900.
    Maybe the A550 with Manual live focus is an alternative.
    Either way it won't be quick , so your subject had better be cooperating.

  9. #9
    Join Date
    Nov 2004
    Location
    Wild, Wonderful, Wyoming
    Posts
    1,043
    So, my question would be: why would you need that length and so-so image quality? You might answer so I can "get the shot", but if the shot is of dubious quality, what good is it, except as a snap? You might as well carry a Panny ZS3 and crop, it doesn't weigh much at all and will get you 400mm.
    A good photograph is knowing where to stand.
    Ansel Adams

    Rule books are paper, they will not cushion a sudden meeting of stone and metal.
    Ernest K. Gann-Fate is the Hunter.

  10. #10
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,560

    Lightbulb Knowing your equipment ...

    One of the nice things about adding a lens like this to an a850 is that you have a lot of image control to render a relatively decent shot. The focus is a bit tricky the closer your subject is, as was mentioned ... but if you do happen to get it right, I believe you will be amazed at how reasonable the image is.

    Just running a DOF Review provides a bit of understanding about this (using the lens' marked settings on its focus collar:

    Subj Dist . . . . . . Near . . . . . . . Far . . . . . Total Focal Plane width
    11 ft . . . . . . . . . 9.99 ft . . . . . 10 ft . . . . . . . . 0.01 ft (That's pretty darn tight!)
    13 ft . . . . . . . . . 13 ft . . . . . . 13 ft . . . . . . . . 0.03 ft
    15 ft . . . . . . . . . 15 ft . . . . . . 15 ft . . . . . . . . 0.04 ft
    20 ft . . . . . . . . . 20 ft . . . . . . 20 ft . . . . . . . . 0.04 ft
    25 ft . . . . . . . . . 24.9 ft . . . . . 25.1 ft . . . . . . 0.13 ft
    35 ft . . . . . . . . . 34.9 ft . . . . . 35.1 ft . . . . . . . 0.26 ft
    50 ft . . . . . . . . . 49.7 ft . . . . . 50.3 ft . . . . . . . 0.54 ft
    100 ft . . . . . . . . 98,9 ft . . . . . 101.1 ft . . . . . . 2.23 ft
    Infinity . . . . . . . NaN ft . . . . . . Infinity . . . . . .. Infinite

    So as you can see, tweaking focus is really touchy, up close ... almost sheer luck and requiring absolutely no movement back & forth. Yes, that means a tripod ... camera shake is the least of your problems. You breathe and the focus changes on you. The focal plane loosens up to a whole 6-inches with a subject distance around fifty-feet. You really need to remember this as you complain about the "natural effects" of this length of lens. Understanding its "performance envelope" is absolutely essential to its use.

    Also, if you have a laser "range finder" device, it would help determining subject distance quite a bit, because most shorter lenses stop at around 20 to 50 feet on their focus ring graduations ... leaving the longer distances clearly ... unclear!

    Nikon (<- click here) has a pretty good and budget-worthy measurement device that can help in these guess-timations, if you want to limit your trial and error shots. AND it still would be a lot lighter to carry than that HUGE 10-lb SIGMA pipe!
    Last edited by DonSchap; 01-07-2010 at 08:44 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

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