Raum

Thank you for the pictures, hopefully the a-mount doesn't have other screw designs.

5 minutes ago, Tomatobro said:

I have done four of these Sony mount Samyang lenses to date but as I recall the rear of this lens was different to the others. Not sure I have a record of why I did it this way.

Do you mean the e-mount or a-mount? I am talking about the a-mount which should have a backfocus of 44.5mm.

48 minutes ago, tomato said:

I’m sure @Tomatobro will supply details but basically a m42 male adapter is screwed to end of the existing Sony lens adapter, as in the photo. As emphasised previously, this thin, plastic adapter is attached to the lens body by three small screws, and will not take the weight of an Astro camera alone, some form of additional camera support is required.

Does he have the a-mount version? By the way, why don't you remove the plastic part you should gain a lot of backfocus that way by using a short 3d printed adapter.

On 15/08/2023 at 19:50, tomato said:

Yes you can use them with an astro camera but  it might not be as straight forward as using the Canon variety as I’m not sure if anyone sells a suitable adapter for this lens to mate with the camera. Myself and @Tomatobro have gone the Sony route by turning up suitable adapters.

I’m no DSLR expert but does anyone sell a Sony to Canon adapter and what does this do to the back focus spacing? Just read the previous post, looks like a non starter.

I am in the same postion as the original post. Except it is a sony a mount (should have a bit more backfocus then the canon version). Do you know anything about it? I plan on conneting it with the 2600mc.

23 hours ago, Elp said:

As an indicator, this is a stark illustration of the size difference, a WO Z61 (an excellent scope overall) and a Starfield 102 (also good but hasn't got the diverse use the former has, it is also a similar scope to those listed above), note these are fully closed positions:

Interesting, thanks a lot for the comparison.  Then I would probably get the 80/90mm triplet, those are quite a bit shorter (around 20cm/ 8inch) then the starfield. The only worry I have then is a portable mount. Any idea on those?

10 hours ago, Elp said:

A lot of these scopes are very similar and some might be made at the same source factory, although they're getting better I don't think you can lump the SVbony within this class. A triplet will usually be better than a doublet but the scope will be heavier so it also depends what mount you have.

Interesting, thx for the answer. They are probably made in mostly the same factory indeed. Don't the tecnosky (not owl version) and the sv550 have the same specs tho?

The FPL51 is of course worse then the FPL53 on the more expensive scopes, but does it matter that much when imaging? The pictures on astrobin look mostly the same for these scopes.

I have the eq6r, but I want this scope to be portable (for possible vacations) if possible. I don't know how much a refractor above 4" (100mm) would be portable tho.

Hi,

After using the Skywatcher 200pds for a while (really dislike collimating it), I want to have a relatively portable refractor (compared to the newt) for mainly astrophotography. I use a modded canon70d, but plan on getting the imx571 cooled cam. I want to stay under 1000€, but if there is a bargain that could be made I could go to a max of 1500€, it needs to have a aperture of at least 80mm (4") and a fl of at least 400mm (without flattener/reducer) a faster scope would be appreciated coming from a newtonian. What would you guys prefer/recommend. I have the following scopes in mind, feel free to recommend other ones if they are better/more suitable to my criteria.

TS optics Apochromatic refractor AP 80/480 ED Triplet Photoline OTA = around 800€ without flattener

Tecnosky ED Triplet 80/480MM F/6 V2 = around 750€ without flattener

SVBONY SV550 APO Triplet Refractor OTA 80 F6 = around 900€ with flattener and guide scope

ts optics Apochromatic refractor AP 80/480 CF-APO f/6 FPL55 Triplet OTA = around 1200€

Tecnosky 80/480 mm FPL53 Apochromat - OWL Series = around 1200€

Askar 103 without flattener =  around 1300€

SVBONY SV550 APO Refractor Telescope Apochromatic Triplet 122mm F7 = around 1500€ without flattener, cheaper during deals

All of these are triplets (either FPL51 or FPL 53/55 (almost the same specs)).

Thx in advance