michael8554

You're in a train carriage alongside another carriage. The other carriage starts to depart. The visual illusion is that your carriage is moving. Michael

A Spotting Scope for Bird Watching. On a tripod. Gives an erect image. Can you open the window on the 30th floor, as glass will blur the view ? Michael

"So this should mean that all 58mm T-rings should go with my camera right?" Probably 58mm. And the filter thread is 0.5 mm, 0.75 mm or 1.0 mm pitch, depending on the diameter of the filter thread. But you're not looking for a T-ring. T-rings/T2 Adapters are the specific description of adapters for removable lens cameras. Michael

As Peter said. T2 Adapters are for attaching cameras with the lens removed, DSLRs etc. Michael

I'd say because a Ha modded camera's spectral response has been skewed towards the red end of the spectrum, I don't know that I'd call it purple. Michael

Hi Jack If you only have one 20mm focal length eyepiece, it effectively becomes 10mm with a 2X Barlow. But if you already have a 10mm eyepiece, you don't need the Barlow. That's why we're asking what eyepieces you have already. Michael

The 6D doesn't have any internal leds that could cause this, at least not on mine. You have the camera's eyelevel finder window blanked off ? Run Elp's tests with the current lens, and then with another. Michael

The Canarias island group is a popular destination for holidaymakers, so you cannot predict where and when aircraft will be intercepting your laser beam. Michael

Hi Maru. "The problem is that for each image it finds 0 stars, " But in your first image, DSS detected 306 stars with the slider at 35% ? I loaded your ARW into DSS, and it detected 148 stars at 30%, I'd use that setting.. However, even at only 4 seconds exposure, the stars in the ARW are not round. So maybe the rest of the 400 Lights are worse ? Michael

Get a Celestron SCT to T2 Adapter. Michael

For the Moon, sub-1sec manual exposures would be less hit-or-miss than auto-exposure, adjust for best result. For dim Deep Sky Objects such as Galaxies and Nebulae, much longer exposures are required, 10 seconds or more. Michael

If you had entered 7th Nov in US format that would come out as July 10th. At 2100 on that date Capella would be about 10 degrees EAST of north. Is that about where the mount slewed to from the usual pointing north start position ? Michael

Probably OD = Outside Diameter eg 1.25 inch OD You can add your country to your Profile that is displayed to the left of your posts. Michael

Depends on how you will be using the scope. Focal length is 400mm, so focused star images are formed 400mm back from the objective. Roughly measure this with a tape measure, this will give you an idea of how much spacing you need. For Visual use a Star Diagonal will work. For Imaging use standard-size screwed extensions, the focuser will take up the rest. Michael

The Meade 6.3 reducer from your old 8" Meade is supposedly NOT compatible with the already-corrected ACF. But why not try it before shelling out a shed-load of money for the "Optec Lepus 0.62x Reducer for Meade ACF". Michael

Worth reading the "EEVA Equipment" section of this Forum. Michael

I googled "Autostar 497 circuit diagram" and got lots of hits. To connect to a Planetarium on a PC you usually have to setup first with the handset, which you can't do. That requires a USB-to-RS232 cable from a PC to the handset, called a Meade #505 cable (not #507) But first post in the Cloudy Nights Meade section, lots of real Autostar experts there. May be as simple as poor contacts on the ribbon to the display, fixes explained there. Michael

Hi Stevie "To be fair they also state "Please be noted that this tutorial only applies to 55mm back focal length. " But IMO, without any mention of CC or FF, that's just as confusing. Michael

That diagram and link is where the confusion starts and generates any number of posts. The link says "Since most telescopes have a 55mm back focal length, " - really ? ZWO should know better. Michael

You mean Storms Storms Storms............. :-< Michael

It's implied in all the replies, but to be clear: You only need 55mm Back Focus from a Coma Corrector or Field Flattener to the camera's sensor, not the camera's body. And not all CCs and FFs have 55mm Back Focus - check the spec. If you don't have a CC or FF you can attach the camera as close as possible to the focuser, to avoid focuser sag. But far enough away from the focuser that infinity focus is possible of course ! The ZWO 533C Flange Distance is as Martin's image. Michael

Go to a B&Q DIY store with one of the screws and find a nut that fits. Then look for a suitable that-size screw. Michael

Astromania M48X0.75 Male/M42X1 Female to M42X0.75 Male Telescope Adapter: That gets you from the M42x1 of the Takumar to T2 M42x0.75 I don't know how thick that is. The Takumar Flange Distance is 45.46mm. The distance to chip on the 183C is 12.5mm. Leaving 32.96mm to fill with the adapter and T2 spacers. Now I can't remember which, but if you over or under fill with stock-width spacers, one will allow the lens to go through infinity focus, with best infinity focus just before the mark on the lens. Michael

What ISO ? Michael