I will use the prism with a 1.25 inch clicklock and have bought the 2 inch to T-2 adapter to do so. How can I unscrew the 3.0 ND filter from the threaded extension? It seems to be stuck or glued to it and I cannot apply more force without risking damage to. The solar continuum filter unthreaded easily.
The filter is not glued in, but unfortunately, sometimes threads get stuck. This may happen also with other adapters. They get even harder to unscrew when you grab them at the side, which can change their shape slightly.
We recommend to put them flat on a rubber mat (e.g. sponge rubber) and put another piece of rubber on top of it. Then put your flat hand on the upper rubber mat and rotate it - this way, the pressure is distributed on the whole filter cell, and the the two parts shut come off easily.
Answer by: Baader Web Team (Admin) on Jan 25, 2021 12:06:00 PM
I have a Nikon D5300 and have been using the MPCC with an M42 t-ring. However, I would like to try to use the larger aperture of the M48 because the vignetting may be causing issues in some cases. Do you have an adapter that will attach a Nikon M48 ring to the MPCC with the correct back spacing? Or do you make a Nikon Protective T-Ring that works with this spacer?
You can use
Reducing piece M48a / T-2i # 2958553
with an optical length of 0,7mm to mount the M48-ring directly to the MPCC. That's good enough, as the distance should be 55+/-1mm, and that close to the MPCC, vignetting is no problem, as the lens is smaller, anyway.
But please take a look at the Nikon bayonet or the adapter: The clear aperture of Nikon F-mount is relatively small, so that vignetting might be caused by the T-ring or camera body.
Answer by: Baader Web Team (Admin) on Jan 25, 2021 9:52:00 AM
I cannot get backfocus.
I am using an Orion Thin Off Axis Guider and a Full Frame Canon 6D Markii.
Your specs require the MPCC to be converted to M48 and for full frame the back spacing needs to be 57.5mm. But there is no adapter available on the market to get the extra 2.0-2.5mm I need.
Canon SLR 44mm
Orion Thin Guider 11mm
Scope is a GSO 200mm F4 Newtonian.
I have tried it using the M42 method with severe vignetting due to it not being full aperature and full frame camera in use.
I am out of ideas and would appreciate your help.
You can use Reducing piece M48a / T-2i # 2958553 with an optical length of 0,7mm to mount the M48-ring directly to the MPCC. That's good enough, as the distance should be 55+/-1mm, and that close to the MPCC, vignetting is no problem, as the lens is smaller, anyway.
Answer by: Baader Web Team (Admin) on Jan 25, 2021 9:17:00 AM
The Nikon Z-cameras have got a back focus of 16mm.
The Wide T-ring need 8,3mm, no matter if you use it with T-2 or with the additional S52 / M48 adapter #2958552
The MPCC requires 55+/-1mm distance, when used with T-2 or the optional Baader M48 Spacer Ring for MPCC III / Protective EOS T-Ring
# 2458405, or 57,5+/-1mm when used with the M48-thread, but without the adapter #2458405
If you use either T-2 or M48 with the adapter #2458405, you need an additional 30.7mm-extension (+/-1mm) in T-2 or M48.
For T-2-this can be done e.g. with
2x Baader T-2 / 15 mm Extension Tube (T-2 part #25A) # 1508154
1x Set: T-2 Fine-Adjustment rings (0,3 / 0,5 / 1 mm) - Aluminium # 2457910
1x Baader VariLock 46, lockable T-2 ExtensionTube 29-46mm with spanner tool (T-2 part #25V) # 2956946
For M48, we do not have the spacer rings yet, but you could use
2x M48 Fine-Adjustment ring 1mm (gold) - Aluminium #2457918
1x Baader Hyperion Finetuning-Ring, 28 mm # 2958228
If you use the MPCC without the optional adapter #2458405, you need a 33.2+/-1mm-extension - for this, we do not have a solution at the moment.
For a fullframe camera, we'd recommend the M48-adaptation because of its larger clear aperture.
Answer by: Baader Web Team (Admin) on Jan 20, 2021 10:09:00 AM
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