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Search: Posts Made By: Binastro
Forum: Binoculars Yesterday, 15:32
Replies: 6
Views: 215
Posted By Binastro
Chinese binocular?

Chinese binocular?
Forum: Binoculars Yesterday, 15:20
Replies: 6
Views: 215
Posted By Binastro
Hi Synaps, A photo would help. Could be coating...

Hi Synaps,
A photo would help.
Could be coating faults or even fungus.
It depends how much of a bargain it is, but if fungus reject it.
Forum: Spotting Scopes & tripod/heads Thursday 14th December 2017, 15:04
Replies: 26
Views: 678
Posted By Binastro
Hi etudiant. post 19. The pocket scopes are...

Hi etudiant. post 19.
The pocket scopes are difficult to use if one is not an expert as the metal bits may need bending slightly to get best images.
Also I think that they are very difficult to make...
Forum: Spotting Scopes & tripod/heads Wednesday 13th December 2017, 21:09
Replies: 26
Views: 678
Posted By Binastro
If one wants real low weight telescopes one could...

If one wants real low weight telescopes one could look up Horace Dall's pocket scopes.
He made dozens from 2.5 inch to 6 inch aperture.
They folded to fit in his pocket including folding tripod...
Forum: Spotting Scopes & tripod/heads Wednesday 13th December 2017, 20:09
Replies: 26
Views: 678
Posted By Binastro
You are correct Alan. On bad days in daylight...

You are correct Alan.
On bad days in daylight even 30x is sometimes a turbulent mess.

I should point out that the clock face was upside down with nothing but objective and ortho eyepiece.

I have...
Forum: Spotting Scopes & tripod/heads Wednesday 13th December 2017, 18:53
Replies: 26
Views: 678
Posted By Binastro
Dear Alan, The observing conditions were not...

Dear Alan,
The observing conditions were not exceptional, as I could repeat the observation with any of the 3 scopes on good nights.
However, we have a temperate climate and quite often static...
Forum: Spotting Scopes & tripod/heads Wednesday 13th December 2017, 15:35
Replies: 26
Views: 678
Posted By Binastro
Hi Alan. I have 3 identical 120mm aperture custom...

Hi Alan.
I have 3 identical 120mm aperture custom made aluminium tube simple scopes. Grey enamel? It was cheaper to get three at the same time. No finders. I don't need them as I use a low power...
Forum: Spotting Scopes & tripod/heads Tuesday 12th December 2017, 07:42
Replies: 26
Views: 678
Posted By Binastro
Joachim, Sorry to hear that. Difficult to find...

Joachim,
Sorry to hear that.

Difficult to find another.
Zeiss built three 300mm binoculars on huge altazimuth mounts. c. 1940, but I don't think they survived.
Leitz built a huge photographic lens...
Forum: Spotting Scopes & tripod/heads Monday 11th December 2017, 22:00
Replies: 26
Views: 678
Posted By Binastro
Or if one wants to do a really good job....

Or if one wants to do a really good job. (:

APM/LZOZ 304mm f/7.5 Super Bino on supplied mount.

Binocular 400Kg.
Complete with mount 2000Kgs.

I saw about $300,000 mentioned, but if interested one...
Forum: Spotting Scopes & tripod/heads Monday 11th December 2017, 14:18
Replies: 26
Views: 678
Posted By Binastro
The best spotting scopes seem to be a Swarovski...

The best spotting scopes seem to be a Swarovski 95 with one or two extenders or a Kowa 88 and similar.
Maybe $5,000? new.

However, a trip to a good local astro dealer would probably allow better...
Forum: Spotting Scopes & tripod/heads Monday 11th December 2017, 11:26
Replies: 26
Views: 678
Posted By Binastro
Hi opus, For ten miles. Firstly you need the Sun...

Hi opus,
For ten miles.
Firstly you need the Sun behind you or at least to the side.
You need height to avoid mirage.
At 60ft height the sea horizon is 10 miles, but you need higher and the city...
Forum: Zeiss Sunday 10th December 2017, 18:54
Replies: 18
Views: 960
Posted By Binastro
At night, the larger the exit pupil, the worse...

At night, the larger the exit pupil, the worse the star images are for me.
But the images are brighter with larger exit pupils.

People with small amounts of astigmatism do better with smaller exit...
Forum: Leica Sunday 10th December 2017, 18:38
Replies: 32
Views: 1,807
Posted By Binastro
Hi Michael, Miksi ei? It's only money. Terve.

Hi Michael,
Miksi ei?

It's only money.

Terve.
Forum: Zeiss Sunday 10th December 2017, 15:53
Replies: 18
Views: 960
Posted By Binastro
I find that many binoculars give me a good view...

I find that many binoculars give me a good view at the 6 o'clock position closer than the focus point at the centre.
I thought this was due to field curvature, but this may be due to both field...
Forum: Canon Sunday 10th December 2017, 15:38
Replies: 13
Views: 550
Posted By Binastro
Woke up late to a white world. The 18x50 image...

Woke up late to a white world.
The 18x50 image stabilizer worked well on the chimney 120m away and the falling snowflakes looked fine at about that distance. The DOF isn't great so one can focus on...
Forum: Canon Saturday 9th December 2017, 21:03
Replies: 13
Views: 550
Posted By Binastro
Hi Stan, Flat on top of the soft case. I am...

Hi Stan,
Flat on top of the soft case. I am surprised I noticed the green light in daylight.
The observation was very brief, perhaps a minute. I realised I needed much more magnification to read the...
Forum: Zeiss Saturday 9th December 2017, 20:54
Replies: 18
Views: 960
Posted By Binastro
Field curvature or other...

Field curvature or other aberrations.

Astigmatism is pretty obvious if one looks at a bright star. It appears as a short or longer line.

An optician will quickly give an opinion.
Forum: Binoculars Saturday 9th December 2017, 19:19
Replies: 39
Views: 1,381
Posted By Binastro
''Disgusted of Tunbridge Wells'' is another group.

''Disgusted of Tunbridge Wells'' is another group.
Forum: Canon Saturday 9th December 2017, 19:10
Replies: 13
Views: 550
Posted By Binastro
Canon 18x50 IS anomaly

There was a strange small box on the wall 40m away, and someone was doing something with it. The second time this mystery box had a visitor.
Alien communicator perhaps?

Being interested, I looked at...
Forum: Binoculars Wednesday 6th December 2017, 20:02
Replies: 22
Views: 1,044
Posted By Binastro
Don't know about DOF but I was able to measure...

Don't know about DOF but I was able to measure distances of a mile, maybe more, with the 317mm Dall Kirkham, 4650mm focal length, just by the focus position of the eyepiece compared to the stars.
So...
Forum: Canon Wednesday 6th December 2017, 15:23
Replies: 13
Views: 770
Posted By Binastro
Unbelievable photos Lee. I think that I have...

Unbelievable photos Lee.

I think that I have just been able to hear some sound with the IS binoculars right up against my ear, but I'll check. I think less sound means less energy consumption.

My...
Forum: Canon Tuesday 5th December 2017, 22:19
Replies: 13
Views: 770
Posted By Binastro
No Dave. I was thinking of getting one until I...

No Dave.
I was thinking of getting one until I found out the price.

The 10x30 IS MkII, which I have, has superb IS, at least this sample, and I have used the18x50 IS for over 15 years.

I really...
Forum: Canon Tuesday 5th December 2017, 21:26
Replies: 13
Views: 770
Posted By Binastro
In good daylight it is plenty bright enough. If...

In good daylight it is plenty bright enough.

If Canon made a 25x50 IS I would get one.
Forum: Binoculars Tuesday 5th December 2017, 18:51
Replies: 22
Views: 1,044
Posted By Binastro
400 years maybe.

400 years maybe.
Forum: Binoculars Tuesday 5th December 2017, 14:29
Replies: 22
Views: 1,044
Posted By Binastro
Hi Peter, Post 8. Try collimating a 20.5 inch...

Hi Peter,
Post 8.

Try collimating a 20.5 inch f/3.9 Newtonian single handedly, even though it has a 1/20th wave mirror.

An ancient 6 inch f/8 secondhand AE Newtonian was amazingly...
Showing results 1 to 25 of 1000
 


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