TareqPhoto

Is this reducer any good with any scope [refractor] if using only 4/3" sensor camera? https://www.altairastro.com/lightwave-06x-reducer-289-p.asp

That was my concern, with Ha i think even my achromatic scope can be fine, but it is not that sharp or i didn't like the results so so much as i feel like maybe a triplet will show better Ha result anyway, if that is not the case then i have to neglect Ha from my question completely and focus with LRGB then. I did read that L will be less sharpness in doublet than a triplet, i started my topic as thinking maybe it is about the optics quality and not only the type of refrctor, so it is likely that a triplet is a must here if LRGB/colors are mentioned, then we should discuss how good is that triplet then. I posted about a quintuplet scope, from my understanding it is like a triplet with 2 additional optics, so shouldn't this be even better than a triplet or in same level of triplet? i can post a link of ~60mm scope that it is mentioned being a triplet, but it is not FPL-53, so does that means the colors will be fine but the quality of colors are bad due to not using quality or better optics? Another option is to buy a known triplet and using an aggressive reducer such as 0.65x or 0.6x or even 0.5x, i have 0.5x reducer [not flattener or corrector], can't i place it to the back of a flattener to have 0.5x reducer and flattener at the same time?

I don't know how much of blue halo is acceptable, i saw very nice beautiful images which i think it has some CA or blue halo around some stars, so i am not sure if that is good to be considered or it is too much

So, until now i still don't know which small aperture 60mm scope with reducer to get then.

Thanks for English dictionary. Well, the gap is about colors in the range, not about the halo, so i don't know what missing colors it will be for that range or how intensity of colors in that reduced wavelengths, not talking about blue or red.

Ok, add refocusing to the questions, i actually have an autofocuser that i will use, and i will buy another for this second scope i am searching, so focusing is a must here, i will use a Bahtinov mask if i don't use any motor, i thought you all are already thought i will do imaging with dead spot on focus with each filter anyway. But that wasn't my plan, my plan is to use Ha or Lum only from this ultra wide 280-300mm scope and the color from my 90mm triplet reduced scope, that was the plan.

Does eat? The problem is that it has a BIG gap between 550nm and 650nm for vapor sodium mainly LP.

I mean L is full spectrum + UV/IR cut, so colors are coming from RGB or color camera, not L with mono.

From where the colors come from? I mean or i said use Lum with doublet and colors with triplet, the halo is blue, so from where that blue came from if Lum is all colors anyway?

I have that IDAS D2 for color camera although i don't have a cooled color camera yet.

I went with one triplet already, but it has FPL-55, i still didn't get it because it is a new model they are making and will be due in March-May as the site mentioned, so it is a triplet, but i am planning to use it with 0.65x reducer and APS-C color camera. At the same time for my dual imaging, i want another scope next to it to give very similar FOv or better to say 280mm-300mm with my mono 4/3" sensor cameras, so my concern here only only about a second scope to give me wide field of 280-300mm with 4/3" and using one filter only or two [Ha and Lum only], not thinking about involving colors with it even if it is a triplet also, but sounds i couldn't find triplets at 280-300mm, maybe only new scopes that are petzval or quintuplet designs and new in markets.

Halo with L filter? i thought it will show a mono result no matter if there is a halo or not, and also you mentioned Astronomik L2 and L3 which i know about long time ago, or even consider LP filter that is more suppression than L.

How much bad blue halo is bad to reject it or not accept it? Is this any good result for example? https://www.astrobin.com/full/m9vm6w/0/

What about a bad ED doublet used with only Ha filter or only L filter? no color filters or color camera.

Ok, what do you think about a doublet with reducer to give me about 280mm-320mm and using a mono camera with only Ha filter or only Lum filter? And what about a triplet with FPL-53 and massive reducer and APS-C color camera?

What do you think about this scope with their own 0.8x reducer? https://www.astronomics.com/astro-tech-at60ed-60mm-f-6-fpl-53-ed-doublet.html There is one very similar or almost the same from TS-Optics as well.

What are you trying to tell me?!!!

Takahahsi FSQ105 and TEC140/150/160/180 and add AstroPhysics 130 for example are all high end very expensive scopes, i barely ordered a triplet last year and still waiting which is almost affordable for me, don't want to buy a second one more expensive than that, and i rushed ordering it before i test my ST80 guide scope with 0.8x reducer, so now all what i want to buy is workable nice scope for 280-320mm focal length with or without reducer.

I was thinking about getting 0.6x reducer, and i will only use it with 4/3" sensor such as ASI1600mm or QHY294M i have, both smaller sensor camera, so you think it is still not good reducer with those? I mentioned scopes that are having their own reducers, so they are designed for the main scope, although i have 0.8x reducer without its same maker scope but i don't mind buying another scope with its own dedicated reducer, but i think i want wider so there are few in this case.

Ok, what do you say or think about this one? https://agenaastro.com/askar-72mm-f-5-6-quintuplet-petzval-flat-field-astrograph-fra400.html

What THING?

Ok, let's ignore that FC-60 then, although i heard that this issue is only if using the flattener that is not that good, while using their reducer will fix this issue, but let's not go deep to analyze this scope and compare it with others, i thought a fluorite will always make nice color corrected over any optics for refractor, as i did read an article which shows that fluorite will outperform all optics used in lenses or refractor and they make FPL-53 to be close to it, they even call FPL-53 or FCD-100 as "Synthetic Fluorite", but i think today i learn something new about it. Well, don't exclude reducers, there are many people using reducers also with amazing results, so i didn't ask to have like 300mm as only native focal length, it can be from reducing the scope also, like from 360mm or 340mm to 270mm-300mm if possible, but sounds you didn't care much about reducers so you try to find super wide aperture to give ~300mm without reducer.

Ok, so in this case i shouldn't put Takahashi and Fluorite on top always unless it is a high end triplet or petzval design then, i thought that all Takahashi scopes even the doublet will outperform another doublets, because i keep reading that Takahashi is a well know manufacturer so they care too much for QC of all their scopes, but maybe that is not the case with all scopes from them, i am also happy to be corrected.

I already posted few options that i think they can be fine, but i have a require by focal length more, then i try to match that focal length to whatever i can find affordable, i mean try to find a scope for me as refractor giving me between 280mm and 320mm, i don't want 360mm nor 250mm, the average is 300mm, so only like -+20mm from it, so find me that quality mechanical scope giving me that focal length and i will stop asking or searching, not interested in RedCat/SpaceCat models.

https://starizona.com/products/apex-ed-65x-reducer-flattener-for-apo-refractors-and-rc-acf-telecopes ^^^ Reading about it they mentioned up to APS-C, so i don't know if that mans it can be fine with APS-C or not, some said they managed to use it even up to full frame, and most likely i will crop the frame from edges anyway, but i have no choice rather than using this or another reducer and then i have to buy a full frame camera and not APS-C, that will cost me even more. Well, that scope your linked is already a doublet with FPL-53, i posted a doublet with fluorite from Takahashi which blows away this one, and yet you didn't choose it for me, i also saw 60mm from Astro-Tech and also 60mm something from William Optics i think Zenithstar model, but i didn't mention them here.