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A friend ask me about filter size, I already had a Excel sheet with that calculation. But I did a new web calculator.
It's the first version but it looks to calculate it correct, have a look:
It's not any high precision calculation, but gives knowledge enough I think.
Too small filter gives vignetting, too big filter empty the wallet.
The weather has been so bad I have had the time to finish a video on using astro filters with the Nikon Z bodies and Nikon camera lenses. There is a manual alternative to the FTZ allowing 1.25 inch filters to be fitted between camera and F-mount lenses, and for some lenses and end of lens solution make sense. FAstroTZ is described here:
By Bruno Marin
I found this setup in internet and make me think, with AZEQ6 GT and 2 scopes, different weights and size, without counterweight in AZ mode!
- I can put a MAK100mm 3kg +- and a OO VX10l 12kg +- without counterweight?
Does anyone have this setup mount and already used without counterweight with two telescopes of different weights? Is it really necessary to have a balance using in AZ mode?
The problem to centralize the object with both scopes is true? With the SW AZEQ6 GT?
Follow the images
a TSA-120 with 6.5 kg i think and the other with 22kg i forgot the brand hehe you can help me?
I'm working with some recent data of a new(ish) camera, and my Ha data is pretty good, but the oiii has these strange artifacts around the borders.
If I use any kind of local normalization then it pretty much ruins most of the image, as you can see below..
First the Ha:
Oiii with local normalization:
oiii local normalization map, see how it fits with the artifacts:
Oiii without any local normalization:
These edge artifacts, could they be related to a bad filter or is it a processing artifact, has anyone seen anything similar?
I am using Astro Pixel Processor for calibration and stacking.. Im kind of stumped on this one, and I am going to yank out the Oiii filter this weekend to have a looksie.
By Anne S
Following a filter size upgrade I have an Astronomik LRGB set of filters, 1 1/4 inch. Probably around 12 years old. Kept in a filterwheel when in use but they have also been stored for a couple of years in their original box when I acquired some Baader ones to match my Baader narrowband filters. No scratches or coating issues. I have tried to show this in the images attached.
Looking for £80 posted given their age.