2 Alpen compact Shasta Ridge (1 Viewer)

I already have a full-size Alpen Shasta Ridge (8x42). Looking to buy a compact binocular for when bicycling (exercise, birding, photography).

Alpen has these 2 models. Do those measurements look right? I am guessing the last number is the length? Seems a big discrepancy with the first number (2 vs 4). The last model is a 8 x 26 (vs the 25 of the first model).

One is a roof prism measuring 2x4x4 (8 x 25)
http://www.amazon.com/Alpen-Shasta-...8&qid=1370400536&sr=1-7&keywords=shasta+ridge

One is a porro prism measuring 4x3x5 (8x26)
http://www.amazon.com/Alpen-SHASTA-RIDGE-waterproof-Binocular/dp/B000FISPQI

We don't have that brand over here so just a guess based on a compact and reverse porro I have. Give or take about a 1/4", bent to an average IPD, 4" long and 3 3/4" wide for both seems about right. The roof might be 1 3/4" deep and the reverse porro about 2 1/4". There may be a little more difference flattened out.

Other details here.
http://www.alpenoptics.com/bino-shasta.html

David

Thanks David. The measurements for the 8x25 model is missing. Decided to call Alpen Optics and the person provided the exact measurements

8x25 roof prism.
L 4.25". W 4.50". H 1.50"

8x26 porro prism.
L 4". W. 4 3/4". H. 2 3/4"

The porro prism I have been told has the slight edge in clarity in lower light due to its coating. I am looking for the more compact model to use while bicycling so purchased the 8x25 roof prism which is 1 1/4" lower in height which should make it easier to squeeze into a small handlebar bag.