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Search: Posts Made By: Kevin Purcell
Forum: Nikon Friday 22nd June 2012, 23:32
Replies: 158
Views: 88,483
Posted By Kevin Purcell
Is that the Japanese marketers picking an extra...

Is that the Japanese marketers picking an extra lucky day (two sevens)?
Forum: Nikon Thursday 21st June 2012, 02:02
Replies: 12
Views: 3,632
Posted By Kevin Purcell
A linear polarizing filter can be a good option...

A linear polarizing filter can be a good option when viewing into the sun over flat water (e.g. shorebirds on a marsh with the light in their direction).

Or you can wear polarizing sunglasses (with...
Forum: Swarovski Monday 18th June 2012, 21:27
Replies: 54
Views: 22,428
Posted By Kevin Purcell
I hope there's no grease in these focusers (it's...

I hope there's no grease in these focusers (it's not like they're my Yosemites).

I wasn't here because I was "using" my bins to look at birds. Mostly the Swaro. Then a spring switch to FL and EDG...
Forum: Zeiss Friday 8th June 2012, 00:25
Replies: 234
Views: 109,165
Posted By Kevin Purcell
The first set of eyecups on the Zeiss FL (at...

The first set of eyecups on the Zeiss FL (at least ... I'm not sure about the second version of "rounder" eyecups) work as continuously adjustable eyecups.

The Yosemites too

One of my favorite...
Forum: Swarovski Thursday 7th June 2012, 22:41
Replies: 54
Views: 22,428
Posted By Kevin Purcell
I've noticed this on my SV 8.5x42 as well. I was...

I've noticed this on my SV 8.5x42 as well. I was rotating around bins and on returning to them (after using the FL and EDG) I noticed how much worse (stiff, asymettric and "gritty") my SVs are.

Need...
Forum: Binoculars Thursday 7th June 2012, 22:30
Replies: 40
Views: 5,675
Posted By Kevin Purcell
Those are going to be big oculars in that bin to...

Those are going to be big oculars in that bin to see the full field (about 23.4mm minimum diameter if I got the maths right).

That should be easy to check.
Forum: Spotting Scopes & tripod/heads Wednesday 4th January 2012, 06:02
Replies: 4
Views: 2,942
Posted By Kevin Purcell
Really? That's so disappointing. NDHunter:...

Really? That's so disappointing.

NDHunter: fortunately I never read it ;)
Forum: Pentax Monday 2nd January 2012, 01:03
Replies: 39
Views: 8,741
Posted By Kevin Purcell
I concur. I have a PF65 with an XF12 and it's a...

I concur. I have a PF65 with an XF12 and it's a good alround combo (though the XW14 would be better!).

If you give up the JIS 4 water resistance a good fixed astro EP like a fixed Hyperion between...
Forum: Spotting Scopes & tripod/heads Monday 2nd January 2012, 00:16
Replies: 4
Views: 2,942
Posted By Kevin Purcell
SLR Magic 12-36x50 ED Spotting Scope and micro 4/3rds camera adaptor

SLR Magic are a Hong Kong based reseller/tweaker of Chinese OEM lenses usually.

They seem to have repurposed a bunch of C mount CCTV style lenses for micro 4/3rd use with adapters (some good and...
Forum: Zen Ray Sunday 1st January 2012, 23:52
Replies: 70
Views: 29,896
Posted By Kevin Purcell
On the 7x v 8x issue: it's a very small...

On the 7x v 8x issue: it's a very small difference.

I find it most useful if you want to own two pairs of the same bin optimized for different habitats or uses then a 7x and a 10x make a good pair....
Forum: Nikon Thursday 5th May 2011, 06:19
Replies: 29
Views: 10,922
Posted By Kevin Purcell
Resolution is well defined property measured at...

Resolution is well defined property measured at center field (so there should be no coma or astigmatism in any sensible optical system) and is measured monochromatically so it says nothing about CA...
Forum: Nikon Thursday 5th May 2011, 06:16
Replies: 88
Views: 28,107
Posted By Kevin Purcell
I have a set of Tarkovsky Stalkers. 7.5x38. Way...

I have a set of Tarkovsky Stalkers. 7.5x38. Way before their time for Soviet bins. though I think they ended up being OEMed in the West. The first to use with pro-reflective coatings and...
Forum: Swarovski Wednesday 4th May 2011, 23:02
Replies: 23
Views: 6,669
Posted By Kevin Purcell
That's exactly it. The "rolling ball" isn't...

That's exactly it.

The "rolling ball" isn't like normal "rolling ball" its more like the edges "roll" or as Kammerdiner more accurately says "does something different out there at the edges". It...
Forum: Swarovski Wednesday 4th May 2011, 22:57
Replies: 378
Views: 107,214
Posted By Kevin Purcell
I guess the SV rainguard comes down to opinion. I...

I guess the SV rainguard comes down to opinion. I love it (as a glasses user so no winged cups for me). It fits on snugly so it never falls off (e.g. in my backpack) but easily comes off when I use...
Forum: Swarovski Wednesday 4th May 2011, 22:51
Replies: 23
Views: 19,782
Posted By Kevin Purcell
Easier eye placement in the exit pupil (so nicer...

Easier eye placement in the exit pupil (so nicer ease of use).

With the flat field/sharp edge to edge a larger exit pupil also makes it easier to "look around" the field. Easier than the 10x42, I...
Forum: Binoculars Wednesday 4th May 2011, 21:28
Replies: 7
Views: 1,470
Posted By Kevin Purcell
That's a magnification realted brightness effect...

That's a magnification realted brightness effect not an exit pupil size effect: lower magnification bins have higher brightness (brightness is photons per unit solid angle not the total intensity of...
Forum: Binoculars Tuesday 3rd May 2011, 17:06
Replies: 7
Views: 1,470
Posted By Kevin Purcell
People have covered all the main advantages of...

People have covered all the main advantages of bigger exit pupil bins: glare (and because of that contrast), comfort and eye-placement, low light performance (for me that's pre-dawn and overcast for...
Forum: Spotting Scopes & tripod/heads Sunday 1st May 2011, 23:04
Replies: 12
Views: 1,606
Posted By Kevin Purcell
The question is would you take a bigger scope...

The question is would you take a bigger scope with you?

There is a brightness/contrast versus magnification trade-off where a lower magnification and higher brightness can help usability with a...
Forum: Swarovski Sunday 1st May 2011, 02:38
Replies: 62
Views: 17,151
Posted By Kevin Purcell
That's not what the video says, Jerry, see my...

That's not what the video says, Jerry, see my quote: ("Excellent center sharpness ... edge sharpness is very good" from the cheesy video. Subtracting the marketing out of that I suspect it means the...
Forum: Swarovski Saturday 30th April 2011, 18:31
Replies: 62
Views: 17,151
Posted By Kevin Purcell
Now the narrower FOV makes sense. They're trading...

Now the narrower FOV makes sense. They're trading weight for FOV (i.e. keeping down the amount of glass they need to put in the prism and EP). I'm sure their focus groups find that people don't like...
Forum: Zeiss Saturday 30th April 2011, 04:51
Replies: 9
Views: 12,509
Posted By Kevin Purcell
One way of encouraging interest in the scope is...

One way of encouraging interest in the scope is to buy a demo/sample from Cameraland ;)

http://birdforum.net/showthread.php?p=2125690#post2125690

#528062 65 T* FL LT DIASCOPE STRAIGHT only...
Forum: Kowa Saturday 30th April 2011, 04:31
Replies: 19
Views: 6,263
Posted By Kevin Purcell
Bummer but I'm glad you've got it back in one...

Bummer but I'm glad you've got it back in one piece: there is a fun feeling that comes along with seeing a good bird with a bodged together piece of kit.

I would expect that the 824 to 823...
Forum: Swarovski Saturday 30th April 2011, 01:37
Replies: 62
Views: 17,151
Posted By Kevin Purcell
They probably do that silently as the bins are...

They probably do that silently as the bins are produced (as Swaro do).

They only add a letter or a * when there is a big change (and I don't think we'll see many of those in AR (T*) or P...
Forum: Binoculars Saturday 30th April 2011, 01:32
Replies: 4
Views: 1,706
Posted By Kevin Purcell
They're three different things: two fo them...

They're three different things: two fo them affect how sharp things are at the edge of field.

Field curvature is literally the focal plane of a lens(es) is not flat. As Steve says you can change the...
Forum: Binoculars Saturday 30th April 2011, 01:14
Replies: 7
Views: 4,453
Posted By Kevin Purcell
CaF2 isn't a glass it's a crystal. If a marketer...

CaF2 isn't a glass it's a crystal. If a marketer says "fluorite glass" it isn't CaF2 just a fluoroposphate crown glass of some sort.
Showing results 1 to 25 of 1000
 

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