Thanks. finally I got yellow, red and blue filter however the OIII Im looking for (bintel) is out of stock so I may wait a bit longer.
Talking about that I saw M22 without any filter last night although there is a serious light pollution at my place. I managed to take few photos however the quality is bad. Tried to stack them but seems no good (or I used the wrong way)
Thanks for the info once again
Quote:
Originally Posted by mental4astro
Hi David,
Filters can be a real money pit. For the planets, Select just two or three - no more. You just won't exploit them enough.
Nebula filters - their efficiency depends singularly on the aperture of your scope. Those that are best suited to large apertures still work in small apertures, just that the image will be so dim as to be impractical.
For a 6" scope, nebula filter wise, I would suggest an OIII as your best option. It is also the best option from light polluted areas. Ultra High Contrast varieties that show up the Horsehead nebula, the image will be just too dim to make out the Horsey. A broad band filter, like an LPR, is good too in smaller apertures.
What filter shows what??? Have a look at this excellent Lumicon filter specification guide. It illustrates just what each filter type transmits and what they are best suited for, including planets. Don't forget, nebula filters CAN be used with the planets too to show up various details.
There are also some sneaky filter options that are modestly priced, but they are absolutely top notch performers. You can get caught up with brands and supposed specs, and ignore cheaper options. But some of these cheaper options do just as well as the "big brands". I'd be happy to put up my GSO OIII filter against any Big Brand type. Omega Optical (who own and make the DGM brand) also market a more modestly priced line of astro filters. I took up their OIII + H beta filter, and had it pooh-poohed by supposedly "knowledgable" people. [Hydrogen beta light band is the light band that the Horsehead is best seen through]. Well, I did a side-by-side comparison of it with two other filters, including the much lorded NPB. Guess what? The modestly priced OIII+Hbeta filter SHOWED the Horsehead just as clearly as the NPB! Yes, the NPB is a different type of filter altogether, and it shows different details too, but as a viable filter option, this OIII+Hbeta is an excellent one without the expense. You might be surprised that there are some real gems out there.
Here's a link t0 Omega Optical and their OIII+Hbeta filter. YES! One ebay!!! So are the DGM line. |