Pentax XF/Panoptic 19/LVW focus point

[Kunama]

Assistance needed to establish the difference in focus point

I am in the process of getting a few sets of eyepieces for the binoviewers.
The issue is that the difference in in/out focus requirements of different eyepieces is critical to how they will work in the bino system.

Here is what I have so far:
1. My XF8.5mm and 12mm are parfocal and come to focus with 5mm spare inward travel
2. The Vixen LVW series are parfocal with each other but compared to the Pentax they require about 3mm more out focus (which is great)
3. I am considering the 19mm Panoptics but have no idea how their focus point compares to the Pentax XFs to the LVWs

My current setup will work if the Panos require the focuser to be racked out compared to the Pentax XFs

Someone must have the answer.
(Sorry Morton, I should have got you to test this before you sent me the XF12 )

[astro744]

See http://www.televue.com/engine/TV3b_p...4#.UzvuKaiSySo

Refer Column 'F' and diagram below the table showing parameters.

[Kunama]

Thanks astro744

and a big thank you to Tamiji Homma on CN who produced a chart that details the inward/outward focus measurements of dozens of eyepieces.

[Kunama]

The new Panoptic 19s arrived today and for anyone interested:

Panoptic 19mm requires 7.75mm more outward travel of the focuser than the Pentax XF8.5 or XF12.

[FlashDrive (Poppy)]

Glad to hear that worked out for you.....

Flash.....

[Kunama]

Originally Posted by FlashDrive

Glad to hear that worked out for you.....

Flash.....

So far so good Col, the issue is that the FS60 focuser has limited travel and as I am using both the Herschel Prism and the 2" Baader dielectric I have to stay within certain parameters or fork out for a Feathertouch which I don't want to do. As it is all my eyepiece pairs reach focus with either diagonal I probably won't need the Zeiss prism I have on order but it will be a nice spare.

I'll try out the Panoptic 27mm tonight.