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APM M.Ludes
Vendor (APM Telescopes)
*****

Reged: 05/01/03

Loc: Germany
Riccardi Apo Reducer for APO & RC telescopes new
      #5916487 - 06/12/13 08:10 AM

http://www.apm-telescopes.de/en/categorie.html?cat=107&filter_id=1180

our triplet Apo Reducer/Flattener using real ED elements and beeing optimized for apochromatic refractors and working also perfect for MEADE ACF and standart Ritchey Chretien telescopes

we have a smaller version with both sides M63 thread for 42 mm image circle and a larger version with both sides M82 thread for 52 mm image circle.

They are in stock

They deliver a performance which many others for more , much more money do not reach

many details see under above link or via email



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pbsastro
professor emeritus
*****

Reged: 03/21/07

Re: Riccardi Apo Reducer for APO & RC telescopes new [Re: APM M.Ludes]
      #5936319 - 06/23/13 12:32 PM

Hi Markus,
This is an excellent product. I already have one. Very good thing you worked together with Massimo Riccardi on this.
But I would like to have a 0.3x or 0.4x version to cover APS-C chips, or smaller CCDs.
You know most popular chips are not full-frame, but are smaller, like the new QE king, Sony ICX-694. I think you would be able to sell much more units as that market is much bigger. Do you think it can happen?

Pedro

Edited by pbsastro (06/23/13 12:34 PM)


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APM M.Ludes
Vendor (APM Telescopes)
*****

Reged: 05/01/03

Loc: Germany
Re: Riccardi Apo Reducer for APO & RC telescopes new [Re: pbsastro]
      #5958488 - 07/07/13 05:16 AM

Hi Pedro,

at such fast reducing everything gets much much more critical, so a universal corrector is not possible, it must be fully matched to a system or it will not work well ...and there are hundrets of diffrent scopes out, so for which one you want to do a match and still get good sales ?


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pbsastro
professor emeritus
*****

Reged: 03/21/07

Re: Riccardi Apo Reducer for APO & RC telescopes new [Re: APM M.Ludes]
      #5964590 - 07/10/13 07:15 PM

Quote:

Hi Pedro,

at such fast reducing everything gets much much more critical, so a universal corrector is not possible, it must be fully matched to a system or it will not work well ...and there are hundrets of diffrent scopes out, so for which one you want to do a match and still get good sales ?




OK Markus, that is unfortunate.
I understand that faster reducers are more critical to the exact scope. I was just hoping that as the true field remains the same, and the apparent field is proportionally smaller, it could be doable.
In fact even the true field could be much smaller. The apparent field of your 0.75x reducer is 52mm, an equivalent 0.4x would have 28mm circle (52/.75x.4). But The ICX-694 is only 12mm x 10mm (15.5mm circle).
A 0.4x reducer providing a 16mm circle would be smaller, as it only needs to take in 40mm of the original scope field, instead of the actual 70mm of your larger reducer (model 2), and 56mm of your smaller reducer (model 1).
If only Sony would make larger CCDs with bigger pixels...

Pedro

Edited by pbsastro (07/11/13 05:49 AM)


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pbsastro
professor emeritus
*****

Reged: 03/21/07

Re: Riccardi Apo Reducer for APO & RC telescopes [Re: pbsastro]
      #6194731 - 11/14/13 02:43 PM

I still dream about a stronger reducer for my 175 AMP/LZOS Apo. I would be happy now with a 0.5x only. That should be easier than 0.3x or 0.4x.
I think the difficulty of making a reducer results not only from the reducing factor, but also from how large is the circle we want to cover.
The ICX694 is the best CCD by far on the market (and cheap too!), and it has only 15mm diagonal. So that means a 0.5x reducer corrected only over 15mm circle.
Comparing to the current 0.75x reducer, we give up 2/3 (45 to 15) of circle diameter to get 1/3 additional reduction (0.75x to 0.5x).
I keep dreaming.
BTW for full-frame or APS-C size sensors, the current reducer is just absolutely perfect. But for the small sony sensor 0.75x is not enough.


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