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Old Thursday 9th November 2017, 09:52   #26
mooreorless
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http://www.birdforum.net/showpost.ph...93&postcount=2

There is thread I started about 6 yrs. ago on this, but didn't want to post a link on this thread.

Last edited by mooreorless : Thursday 9th November 2017 at 09:55.
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Old Thursday 9th November 2017, 10:26   #27
Gijs van Ginkel
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mooreorless, post 26,
In the post you are referring to you mention about the extenders used, that they are phase coated. The extenders I know are lens-only types, so no phase coatings required. Did the extenders you used have roof prisms?
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Old Thursday 9th November 2017, 12:57   #28
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Originally Posted by Binastro View Post
Further to post 23.

Actually, in my experience, making good afocal components is more difficult than making good teleconverters.

The Zeiss Mutar 1.7x was the only Zeiss lens that I tested that used radioactive, probably thorium glass. I presume it was too difficult to make well using regular glass at that time. I suppose Zeiss may have occasionally used such glass elsewhere.

The only really useful point for me about afocal adapters is that it can make camera lenses faster.
For instance a 50mm f/1.2 lens can be changed to 30mm f/0.72 approx. with a wide angle afocal front component.

The very fast refractive Zeiss lens around f/0.3 I think uses this principal, maybe with an elliptical front element.

With binoculars I suppose large afocal front elements might be too large to use on roof prism binoculars.

The best solution is just to use high power regular binoculars designed for the job.

Incidentally, what year was the improved Swarovski colour neutral booster introduced? Did it have a different part number?



Binastro,

I have a Swarovski 2x Booster. The instructions for use that came with it are dated 2004. I purchased it in 2012. I use it occasionally on my 7x42 SLC B which was made in 2006. I never noticed any color difference while using it.

It came with adaptors for the 32mm ELs and the 10x42 SLC. You can also send in for free SLC twist in eye cups for older model SLCs.

I've looked for a part number on it and in the literature and on the Box for it but I can't find one.

Bob
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Old Thursday 9th November 2017, 16:08   #29
Binastro
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Bob,
I have a Swarovski booster bought secondhand perhaps 3 years ago.
The instructions don't have a date?
It is almost as new, boxed.
The box has EAN and UPC numbered barcodes.

It says order the new SLC twist in eyecups free of charge.
Genuine Swarovski UK import.
It comes with adapter EL-32/Booster and Adapterring SLC 10x42.
But I have no Swarovski binoculars to go with it.

I got it to use with the Canon 18x50IS, and also an Opticron 2.5x bought secondhand.
Both were I think good prices.

However, I am not good at colour shades as birdwatchers seem to be, although good at textile shades.
So, I don't know how old the booster is.

I never seriously and firmly attached either booster to the Canon 18x50 IS, but with IS on I tried them and the Opticron booster was not really useful. A hand held small spotting scope jammed against the window frame is better.

I suppose the Swarovski booster firmly attached might work.
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Old Friday 10th November 2017, 09:59   #30
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Quote:
Originally Posted by Gijs van Ginkel View Post
mooreorless, post 26,
In the post you are referring to you mention about the extenders used, that they are phase coated. The extenders I know are lens-only types, so no phase coatings required. Did the extenders you used have roof prisms?
Gijs van Ginkel
Hi Gijs, Yes I would say so with needing phase-coating. These are straight. I tried to look up under Vortex and there is not much info and could not find any under the Bushnell etc.
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Old Friday 10th November 2017, 18:00   #31
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Binastro

Your post #29.

I have my doubts that the Swarovski 2x booster could be used on any other binoculars than the ones it is made for.

The Zeiss 3X12 Boosters might be a better choice but they are expensive. They have an eye piece that has some stretch to it.

They are special order through Camera Land.

Bob

Last edited by ceasar : Friday 10th November 2017 at 18:06.
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Old Friday 10th November 2017, 18:03   #32
Alexis Powell
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...I have my doubts that the Swarovski 2x booster could be used on any other binoculars than the ones it is made for...
Check my post #4. It works fine on lots of bins. --AP
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Old Friday 10th November 2017, 18:16   #33
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AP

Your post 32.

It probably can be used by some but I wouldn't have the patience for it I'm afraid. I have enough trouble using it on my 7x42 SLC B freehand now because the field is so narrow. I usually use it with the binocular on a tripod or on my small Polecat Monopod and when I can sit down because of my aching back.

Bob

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