Posted 30 December 2012 - 11:52 AM
I just found this italian telescope maker
They have a series of Baker-Schmidt cameras that look very interesting and inexpensive. I corresponded with the owner (I speak the language) and he confirmed that they design and produce all their optics. Their scopes are made to order, delivery time is 4-8 months.
Does anyone know anything about them? Their prices look extremely interesting.
Posted 30 December 2012 - 12:29 PM
Mod can you please move this thread to the Cat and Mak's forum? Thanks!!
Posted 30 December 2012 - 07:49 PM
Posted 31 December 2012 - 12:28 AM
How would you determine whether or not the primary is undersized? Is there specific information/specs that you need?
Posted 31 December 2012 - 12:48 AM
Posted 31 December 2012 - 01:24 AM
The amount of 'over-sizing' depends on the desired circle of full illumination, which in turn is driven by the designed-for sensor size.
Posted 31 December 2012 - 09:20 AM
I will post the reply from the manufacturer as soon as I hear back.
I also asked for the weight of the scope. I wish they had more info on their website.
Similarly fast scopes from the more well known manufacturers cost 2~3 times as much!
Posted 31 December 2012 - 11:35 AM
LASTRA 400 SPECCHIO 400 FOCALE 1200 € 5.735,00
I did not see what the optics made of Pyrex/Quartz ?
Posted 31 December 2012 - 06:44 PM
I believe what that means is that the corrector plate is 400mm, the mirror is 400mm and the focal length is 1200 so that would make it an f3.
Mirror material is a very good question! I will ask that too.
Posted 02 January 2013 - 11:34 AM
Posted 02 January 2013 - 05:40 PM
Certainly true for the 'classic' Scmidt camera, where the detector lies at the focus of the primary. But when a secondary is installed which has some amplifying power (as is the case here, in order to place the image at an accessible location beyond the back end), the amount of oversizing of the primary mirror is reduced.
For example, on an f/10 SCT (with f/2 primary), for a 25mm image circle the primary most certainly need not be oversized by 50mm. But for a similar aperture f/2 primary working as a (classic) Schmidt camera, the primary would indeed have to be 2" larger.