127mm Lens

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LDW47
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127mm Lens

#1

Post by LDW47 »

My info is sparse but I have a chance to buy a 127mm f5 home made refractor with a Jaegers achro lens in like new condition. Anyone know much about or have tried / owned a Jaegers lens ? It comes with a CG-4 mount and all the other necessities for $600 C incl shipping.
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Lady Fraktor
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Re: 127mm Lens

#2

Post by Lady Fraktor »

From my reading the early lens sets were good but there was a continuing change of staff and optical quality became a roll of the dice.
Here is a comment from a owner on CN (second last posting):
https://www.cloudynights.com/topic/9503 ... refractor/
Telescopes: 1 more than I need but 2 less than I want
Mounts: 5 Equatorial, 3 Az/ Alt
Diagonal: 3 mirror, 2 Amici, 1 Herschel
Eyepieces: Possibly more than 1 person requires
Image
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Re: 127mm Lens

#3

Post by Lady Fraktor »

A possible alternative? 152mm f/6.5 instead of 127mm f/5 though
https://astrobuysell.com/propview.php?view=58257
Telescopes: 1 more than I need but 2 less than I want
Mounts: 5 Equatorial, 3 Az/ Alt
Diagonal: 3 mirror, 2 Amici, 1 Herschel
Eyepieces: Possibly more than 1 person requires
Image
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LDW47
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Re: 127mm Lens

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Post by LDW47 »

Lady Fraktor wrote: Tue Jun 08, 2021 5:30 pm A possible alternative? 152mm f/6.5 instead of 127mm f/5 though
https://astrobuysell.com/propview.php?view=58257
I already have a 127mm, f6.6 but I am thinking of a 2nd scope for my remote camp where skies are Bortle 1, SQM-L 22.05 most nites.I will be mounting it on a Vixen Porta II as I am not an EQ guy. The 152mm would be a little big. Thanx though.
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Don Pensack
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Re: 127mm Lens

#5

Post by Don Pensack »

CA-ratio-chart-achro.jpg
I don't know how you use a 5" refractor on a Vixen Porta mount, but maybe as long as you use low powers.
Where achros are concerned, I use the following chart:
Astonomer since 1963
Currently using a 12.5" dob and a 4" apo refractor
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LDW47
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Re: 127mm Lens

#6

Post by LDW47 »

Don Pensack wrote: Tue Jun 08, 2021 7:06 pm ImageI don't know how you use a 5" refractor on a Vixen Porta mount, but maybe as long as you use low powers.
Where achros are concerned, I use the following chart:
I have that chart but I don't follow it just use as a general guide. At low / med. powers not a big problem, at higher powers, up to a point, the Porta is manageable. Luckily I am not a high power observer in most cases. I am looking for a larger AZ mount, not an EQ lover. CA is a non issue in my observations.
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Don Pensack
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Re: 127mm Lens

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Post by Don Pensack »

Some fairly inexpensive upgrades from the Vixen Porta Mount:
Stellarvue M2C
Explore Scientific Twilight-II mount (now discontinued--have to find a used one)
Losmandy AZ-8
Tele Vue Gibralter HD-5
Explore Scientific U-mount
Vixen AP alt/Az mount
Desert Sky DSV-2
There are a lot of more expensive mounts, of course, going from the Disc-Mount prices to Rowan to all the way up to 10-Micron mounts
But the above are a LOT better mounts than the Vixen Porta, yet still affordable.
Astonomer since 1963
Currently using a 12.5" dob and a 4" apo refractor
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LDW47
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Re: 127mm Lens

#8

Post by LDW47 »

Don Pensack wrote: Thu Jun 10, 2021 6:11 pm Some fairly inexpensive upgrades from the Vixen Porta Mount:
Stellarvue M2C
Explore Scientific Twilight-II mount (now discontinued--have to find a used one)
Losmandy AZ-8
Tele Vue Gibralter HD-5
Explore Scientific U-mount
Vixen AP alt/Az mount
Desert Sky DSV-2
There are a lot of more expensive mounts, of course, going from the Disc-Mount prices to Rowan to all the way up to 10-Micron mounts
But the above are a LOT better mounts than the Vixen Porta, yet still affordable.
I will have a look.
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