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Posts Made By: Markus Ludes

November 5, 2002 10:20 AM Forum: Zeiss

Zeiss 100 mm Huygens Eyepiece

Posted By Markus Ludes

Luckily I came across with a very rar big Zeiss refractor eyepiece,. a Huygens F= 100 with a fieldstop of 135 mm clear aperture.

Just for interest here the picture

Markus

November 19, 2002 10:14 AM Forum: Zeiss

Zeiss Sun and Mooncamera 9x 12

Posted By Markus Ludes

This is a very rar large format camera with filters, guiding eyepiece etc. and was used in 150 mm and larger zeiss Refractors. I sold it now and before I remove the image from my computer , I safe it here on the group

Markus Ludes

December 31, 2002 05:25 AM Forum: Equipment Talk

Happy New Year to all

Posted By Markus Ludes

Let me take this last chance today to wish you and your family and to all your friends a very very happy new year with most possible peace, most sunny days and best seeing free clear nights

Talk to you next year again

Markus Ludes

January 10, 2003 03:30 AM Forum: Astro Binoculars

Need help on NIKON 20 x 120 II collimation

Posted By Markus Ludes

a US customer bought from me a old pair of NIKON Binoculars Modell II, many years old and used. Before we shipped it , it was perfectly collimated and we did a hgood packing job, however it seems it arrived misscollimated. Deutsche Optik is willing to fix it, but asking about $ 400, which i think is very very expensive. Does anybody here know a less expensive source in USA who could help ? Of course we could do it in germany, but that 2 way shipping will also be to expensive

thanks for any help and ideas

Markus Ludes

February 16, 2003 07:15 AM Forum: Binoviewers

Denkmaier via BW Binoviewer

Posted By Markus Ludes

Hi Guys,

beeing back from the Winterstarparty I have a few questions.
Due the great reviews on the Denkmaier unit I liked to check them out at WSP with reason maybe to start selling them in Germany as a bino priced between Baader and BW Optik, where the Denkmaier offers also the aperture between.
2 Dealers at WSP have had the Denkmaier unit and I got it for loan to check it out. I was told this are brandnew units , but In found problems which shall not excist after reading all this reviews.

Here what I found and I like some feedback of owners If I have had only faulty units in my hands or if that represents the real production quality.

1, the prisms showed the edge badly polished, partly looking like extremly rough worked, as I have seen before only in cheapest chinese stuff
2, the prisms have been perfectly clean but showed a bit like fogged against the total clean BW Optik Modell

I wrote reports that the DENKMAIER shall have a higher transmission, but what I saw was a superb clean crystalclear BW Optik unit and dimmer Denkmaier unit.

The dealer there took one my ´BW Optik unit and sold them all, nobody wanted the Denkmaier when they saw the big diffrant in brightness, contrast and quality of the BW Optik.

This mail is not a insulting of Denkmaier stuff, its a simple question if the dealers at WSP showed faulty stuff or if that shall be really the units about everybody reports only good things.

thanks for your feedback if you have a denkmaier unit

best wishes
Markus

February 24, 2003 09:08 AM Forum: Binoviewers

Some Technical Infos about Binoviewers

Posted By Markus Ludes

This morning I have had the chance to talk with the old Masteroptician in Eastgermany who producing the BW optik Binoviewers and my questions he answered as follow

1, Question: what is better Bak4 or BK 7?
Answere: Bak 4 is used to compensate some spherical aberrations, but prism made without real spherical aberration better using BK 7, because that BK 7 glas is way better in homogeneity than Bak4 and can be much better polished

2, Question. what kind of coating is used in BW optic Binoviewers
answere: Braodband spectral coating with 99.5 5 transmission per surface over the visual spectral range

3, Questions: why one side is in most dimmers than on other side and why some are more similar on each side ?
answere: standart nonobstructed systems with best coatings show and must show a bit diffrenc ein brightness due diffrent long optical path. Binoviewers showing equal brightness on both sides using a design with 30~50% obstruction at one side . Some technics excist to make a binoviewer looking equal bright on each side, but it requires very special ultraexpensive coatings and such binoviewers going for not less than $ 2,000 worldwide on the market

I hope this info helps a bit

best wishes

Markus

February 25, 2003 09:35 AM Forum: Equipment Talk

New APM Telescopes Yahoo Group

Posted By Markus Ludes

I like to invite anybody who is interested to visit our today started
yahoo group to discuss with us our products, problems, service ,
possible improvements and more

http://groups.yahoo.com/group/apm_telescopes/

thanks

Markus Ludes

March 27, 2003 10:46 AM Forum: APM

New generation TMB 80 mm Fluorite Triplet Apo

Posted By Markus Ludes

Now the final version of the superb TMB 80 mm Triplet Fluorite Apos are available from stock, long wait time is over.

The lens is designed as a superapochromatic lens with 4 crossings and contains from a real colorfree triplet airspacest Fluorite Apos with one of the worldbest available multicoatings.

The Tubes are CNC mashined alutubes, made in Europe, using the famous Starlightinstruments Feather Touch Focuser 2", offering a maximum backfocuse of 9.5 inch, coming with a tubering , ready to go on phototripods and accepting finders like the famous Tele Vue Starbeam.

The 80F/6 ( D=80 mm f=480 mm) weights only 6.5 lbs and its shortest transporting lenght is only 9 inch, without diassembling the tube, which is possible easily to make it even more compact.

The 80F/7.5 ( D=80 mm f=600 mm) weights only 7 lbs and its shortest transporting lenght is only 14 inch, without diassembling the tube, which is possible easily to make it even more compact.

Price include shipping US $ 1,990

Markus Ludes
APM-Telescopes

April 10, 2003 11:31 AM Forum: APM

Re: Eyepieces

Posted By Markus Ludes

we expect to get the prototype next week, than ship to TMB if, all is okay, we start shipping to customers around end of may

we will make 4mm, 6mm, 8mm, 10 mm, each $ 195

best wishes

Markus

April 17, 2003 01:03 PM Forum: Eyepieces

New TMB Super Mono

Posted By Markus Ludes

here comes first images of the new Super Planetary Eyepieces, designed by TMB Optical

Markus