Pro-optic Ultra Giant 25x100


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Brand and Model:Pro-optic Ultra Giant 25x100
Price ($USD):$899.95
Attributes:un-checked Waterproof checked Armored
Objective Lens Size:100 mm
Magnification:25 x
Prism Type:BAK4 Porro
Coatings:Multi-Coated
Field of View:2.5 degrees
Eye Relief:10 mm
Near Focus:0 ft
Weight (lbs):8.5
Dimensions (w/h/d):13.4"x7.75"
Description:25x100 Ultra Giant Series

The ultra large aperture of 100mm provide more than 50% more light gathering power than the standard 80mm Giant Binoculars. For a delightful experience in astronomical viewing.
Feature multi-coated optics, BAK-4 prism, built-in platform which mounts on a tripod.

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Pro-optic Ultra Giant 25x100
I bought the 25x100 for the sole purpose of viewing the Milky Way. I expected lots of aberations and false color on bright objects, but IMHO these binoculars were not made for viewing bright objects. They perform admirably on DSO. My only complaint is the curvature of the field, the edges are softer, only the center 60-70% is tack sharp. But what do you want in a very fast achromat (something like f3.5)?? I love them, it is a huge difference how globulars or nebulas look in 26x70 and these. My Pro-Optic 25x100 show them much much larger and better defined, even though the magnification is virtually the same. I would never go back to 70mm. And if I wanted to spend 12 times more I would get the APO Fujinons 25x150 ! I cannot give the optics a 10, but considering their purpose I am comfortable giving them 9. The overall and the value are both definitely 10.

Overall Rating: 10
Optics:9 Value:10
Weight: 10 (Trustworthy Vote)
Date:
By: 4rBetter
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=135783


Pro-optic Ultra Giant 25x100
I have the 25X100mm. This is lowest cost 100mm SuperGiant bino on the market. The Orion 100mm SuperGiants are no longer listed the their catalog. Smalll package for 100mm Giants weighs about 8.5 lbs with mounting platform.

Good optics, sharp in the center 50%, about the same as my 20X80mm Orion. A bit more color on bright objects. Outer 20% of Field not sharp but with 65 deg APOV the overall veiw is still very good. Bright stars and moon show a lot of false color. I can see maybe 1/2 mag dimmer stars. Going from 50mm to 80mm binos the difference is dramatic, less so from 80mm to 100mm.

The 100mm SuperGiant is a special binocular for deep space. Get the 25X instead of 14X for large image scale. 4mm exit pupil is fine for this pair because of the huge objective. Even at $899 this pair cost more than twice the price of the Orion 20X80 but don't expect to see twice the number of stars. 20X80mm giants are a very good value. I recommend looking at the new Oberwerk 20X80 delux if you want the most aperture for your $$.

Overall Rating: 9
Optics:8 Value:10
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.242.109)
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=91486

>I have the 25X100mm. This is lowest cost 100mm SuperGiant bino on the market. The Orion 100mm SuperGiants are no longer listed the their catalog. Smalll package for 100mm Giants weighs about 8.5 lbs with mounting platform. 
>
>Good optics, sharp in the center 50%, about the same as my 20X80mm Orion. A bit more color on bright objects.  Outer 20% of Field not sharp but with 65 deg APOV the overall veiw is still very good. Bright stars and moon show a lot of false color.  I can see maybe 1/2 mag dimmer stars. Going from 50mm to 80mm binos the difference is dramatic, less so from 80mm to 100mm. 
>
>The 100mm SuperGiant is a special binocular for deep space.  Get the 25X instead of 14X for large image scale. 4mm exit pupil is fine for this pair because of the huge objective. Even at $899 this pair cost more than twice the price of the Orion 20X80 but don't expect to see twice the number of stars.  20X80mm giants are a very good value.  I recommend looking at the new Oberwerk 20X80 delux if you want the most aperture for your $$.



Since I posted the above review in  May 2002 both Apogee and BurgessOptical have started to offer 25X100mm Ultra Giants for US$299.  In fact, this model is no longer listed in the the current Adorama ads(Jan 2003).  I still use my ProOptics 100 mm frequently. I like it because it's much more compact than the Burgess.  However,  if someone is looking to get a 25X100mm giant bino today I would recommend getting the Burgess because the price is so much lower.  Invest the savings in a nice tall tripod and binocular mount.

Erik D

PS.  25X100mm binos are more like twin low power refractors:  they are huge and have narrow FOV(2.5-3.5 deg). You will need a good fluid head rated for a least 10lbs to mount them.  If you have been using 50mm or smaller binos for astronomy it's probably better to move up to 15X70 or 20X80mm first.  The new Burgess 20X80 LW looks especially attractive at $149 and 3.7 lbs!
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