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Thread: seibert optics

  1. #11
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    With respect to quality, they're not left wanting in that department; also the Performance series have a 65-deg. FOV which is quite wide for a quality $49 EP; the only worry is the 7mm eye relief (ER), try to see if you are comfortable with this rather tight ER by trying one out - ER is one aspect that is so personal having such diverse levels of acceptability from one viewer to another.

    Best,

    Hernando

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    the only thing i really have to compare it to are the 2 eyepieces that came with my scope, a zhumell planetary z 5mm eyepiece, and the celestron zoom. the 2 that came with my scope have small eye reliefs and the zhumell and celestron have huge eye reliefs. so the quality of the performance series is pretty good? i just wish he made a 20mm in the performance series. it jumps from 7-10-12.5-15 then he has the 35mm which i think i might also try out
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  3. #13
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    Yeah performance is good if we are to go by the assessment of others - you're read the good reviews about them and they're true, Siebert EP's have quite a following and fanbase, and as Pierre mentioned, Harry Siebert the owner/maker custom-builds EP's for anyone who would want them so making a 20mm for you would be a cinch. Try to give him a call, to request for a 20mm - it is said he answers phone calls himself; emails too, but it takes sometime for him to respond via email. Discuss also your concerns about the ER, he might be able to do something about that as well. Good luck!

    Best,

    Hernando

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    The 35mm didn't work in my 5" F/5 dob. The exit pupil was too big, and I got blackout.

    It is a good idea to equip your scope to reach both it's highest and lowest capabilities.

    As the EP focal length goes up, and the magnification gets lower, the exit pupil gets bigger, and when it exceeds 6 or 7 mm, the EP doesn't work any more. Go here and find the shortest EP that will work in your scope. It will be around 32mm, if I remember. I got a 35mm ep for my dob, and ended up exchanging it for a 30mm. I already had credit for the performance model, so I sweetened the pot enough to exchange it for the ultra.
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    thanks for the info hernando and pierre. i did not know that if you get an eyepiece too high that you will get blackouts. learned something new today! my telescope probably wont work with the 35mm. so i should just stick with around 30mm for the highest mag and i got the 5mm zhumell planetary z for my low eyepiece and it works pretty good. i think im going to give them a call. i emailed them last saturday. so just waiting for a reply. im not too much in a hurry. they just look like nice eyepieces and cant wait to try them out! im sure they will make the eyepiece a little longer to fix the filter issue. and hopefully make me a 20mm in the performance eyepiece which wouldnt be as expensive as the ultra series 20mm eyepiece.
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