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    Default Filter / Reducer questions



    Hello, I'm trying to practice taking some photos with different exposure times. I'm going for the Orion Nebula first because its the easiest for me at the moment. I have an oxygen III narrow band filter and was wondering if that would help or hurt me? I have allot of LP where I live but don't want to sacrifice the natural colors either. I'd test it myself, however I don't know when the next clear sky will be down here. Also I purchased a 6.3 reducer for my 9.25 XLT and it works great with eyepiece use but when I tried to use my dslr I couldn't achieve focus. I had the focus knob all the way counter clockwise and it was close to being in focus but ran out before I could get there. I'm using a T4i with eyepiece adapter plugged into my stock 1.25 angle. Is the problem that Im using an angle instead of running strait into the scope? Just trying to figure out before I purchase more equipment.

    Thanks!

  2. #2
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    Default Re: Filter / Reducer questions

    Hi, I don't know much about SCTs, never used one...but I do know you need to remove the diagonal and insert the camera nosepiece into the scope. And if you can, as soon as you can, get a 2" camera nosepiece, it will reduce vignetting in your images.

    The diagonal introduces way too much back focus in the imaging train. As far as the OIII, it's more beneficial when viewing visually, and M42 is so bright, you shouldn't need to use an OIII on it, unless you want to play around with the colors in post processing. For light pollution, a LP filter would be the better choice of filters.

    A UHC-S will really kill the LP, but will change the natural colors considerably. Your RAW images will look like a ripe grape color....

    Hope the info helps, have a great time imaging M42...good place to practice.

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    Default Re: Filter / Reducer questions

    You need to ditch the diagonal for photography. From your description, it appears that you have a universal T Adapter not a SCT T Adapter. If you do have an universal T Adapter, screw your focal reducer directly onto the back of your SCT. Screw your visual back onto the focal reducer and insert your T adapter into the visual back. You will have plenty of back focus.

    If you have a SCT T Adapter the order is Focal reducer, SCT T Adapter, Camera.
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    Default Re: Filter / Reducer questions

    what's the difference between a universal and SCT T adapter?

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    Default Re: Filter / Reducer questions

    Quote Originally Posted by aysee View Post
    what's the difference between a universal and SCT T adapter?
    Size and how it attaches. The SCT adapter is substantially wider which means much less vignetting. It is also designed to screw onto the back of the scope or onto an intervening Focal reducer if you are using one. It is also much stronger and will never accididentally detach itself from your scope, unlike a conventional t-adapter, which can fall out of a diagonal or visual back in the blink of an eye..

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