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Old Saturday 16th September 2017, 16:10   #76
Nixterdemus
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Join Date: Mar 2011
Location: Central AR
Posts: 570
Quote:
Originally Posted by Alexis Powell View Post
Fixed focus doesn't work for delivering high resolution views quickly at different distances inside "infinity".
I mount the lightweight porro II IF Ross Stepray 12X50 w/ease and being ambidextrous focus w/both thumbs and index fingers simultaneously.

Granted they do not shine on close focus, so I whip out me monocle for close work ...
-
I can only recall eating the two anchovies though the smaller EP M5 totin' an extra 5X did resolve more from the back of the mail cave. Using that as a precedent I come to the conclusion that I can resolve more w/13X than an 8X, conceding brightness to the lesser power, hand held.
[ETA: To be fair 10.67X should resolve more for me hand held than an 8X or 9.33X Vs. 7X.]

Since Cookie is an international author perhaps he can intervene on me account, plying oratory skills under the guise of diplomacy seeking optical nirvana, for a F/6 125-130mm spotter w/2" eyepiece mount. I feel the need for much more fov at higher magnification.
===
For nomination in honourable mention the CBS, Christoph Beck & Sons, Beck Kassel Tordalk/Panet 22x80:

https://i.ebayimg.com/00/s/NzY4WDEwMjQ=/z/vt8AAOSwLsBZPVHw/$_86.JPG

http://imgserver.astrosell.it/image/...7_P1030516.JPG

http://cdn04.trixum.de/upload2/11240...913a800c4b.jpg

Beautiful royal purple felt, gold trim inside lid "Edward Marcus LTD. London", und leather case, winged eyecups w/rubber objective bumpers sportin' very little ER. Hinge cap, "Made in Germany" w/left barrel objective cap in white, "Supplied by Edward Marcus Ltd."

[The case in the last pic was made in Germany utilizing two brass anchors mounted high on the outside of case for the shoulder strap to attach w/lid having a spring loaded push snap latch. No middle leather strap to assist bin removal. The felt is the same colour though noticeably no regards/nod to Ed Marcus under the lid. Same objective bumpers for laying objective end down on table w/o scratching along w/helping secure the bins inside the case for snug fit. Mine is missing the winged eyepiece covers. The case in the first pic is as mine w/exception of the shoulder strap mountings. The 11X80 bins in the second pic have a second focus wheel by the front caps as does the Saturn 15x60. Mine does not.]

On the outside of the case on mine where the middle bin removal assist leather strap is brass riveted is proudly stamped, "Made in England". In redundant fashion the shoulder strap loops under the case via two leather strap collars sewn top/bottom on the sides. Lid is secured by elastic sewn on nickle D-ring riveted to leather fob w/two piece washer style nickle rivet to nickle anchor riveted to case.

Weighed w/small neck strap at a hair over 48 ounces. No tripod mount as these were made for sporting gents to hand hold. Depending on market marked, "Beck Kassel w/"CBS" triangle badge, "Tordalk" or "Planet". Left front cap "Light Weight" right front cap, "Coated Optics" Both objectives/eyepieces coated at least on the outside.

The Tordalk 15X80 was highly regarded in its day. One gent prefered them whilst gazing for undiscovered comets. George Alcock used them and WWII German 25 x 105's to discover 5 comets and 5 novae.
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Celestron M2 f/5.4 100mm ED-Manfrotto 516 fluid head w/140mm sliding plate

SLV 50* 4mm-- HD-60* 4.5mm-- UWA 82* 5.5mm-- SLV 6mm-- Luminos 82* 7mm-- MWA 100* 10mm-- Luminos 15mm--TV Nagler 50* 3mm/180X - 6mm/90X Zoom

Last edited by Nixterdemus : Sunday 17th September 2017 at 15:43.
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Old Saturday 16th September 2017, 18:15   #77
Maljunulo
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Join Date: Apr 2008
Location: Connecticut
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Fixed focus is a hoax perpetrated on the uninformed.

It ranks right up there with the digital antenna.
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Old Saturday 16th September 2017, 19:01   #78
Binastro
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The British Avimo binocular is fixed focus I think, although I haven't tried one.

They were deemed sufficient for young soldiers whose use is for distance observing.

Similarly the Bushnell 4x21 and 4x30 Xtrawide are fixed focus.

I cannot really use the 4x21 because of little accommodation, but stars at the edges are in focus for me with I think field curvature.
Children, however, seem to love them with 18.5 degree field. Actually 3.5x21.

I gave a friend's son the Konus 10x50 fixed focus and he finds it to be fine for astronomy.

P.S.
Although the early Minolta autofocus binoculars are not very good the later ones such as the 8x23 I find to be superb in good light. It focuses almost instantly, much quicker than manual focus binoculars and is pin sharp.
It does have trouble in dense foliage but no more than good autofocus camera lenses.
In addition it has a very large dioptre correction range.
But it is bulky and needs a battery.
It was a very good effort by Minolta.

Last edited by Binastro : Saturday 16th September 2017 at 19:11.
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